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rework tty handling

Browse Source 
We now make sure to run all services in their own session, possibly with
a controlling terminal.

This also extends the service and socket state machines a little.
This commit is contained in:
Lennart Poettering 2010-04-13 02:06:27 +02:00
parent 4112df1635
commit 80876c20f6
16 changed files with 1148 additions and 341 deletions
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600
execute.c
View File

@ -115,130 +115,320 @@ static int flags_fds(int fds[], unsigned n_fds, bool nonblock) {
return 0;
}
static int replace_null_fd(int fd, int flags) {
int nfd;
assert(fd >= 0);
static const char *tty_path(const ExecContext *context) {
assert(context);
close_nointr(fd);
if (context->tty_path)
return context->tty_path;
if ((nfd = open("/dev/null", flags|O_NOCTTY)) < 0)
return "/dev/console";
}
static int open_null_as(int flags, int nfd) {
int fd, r;
assert(nfd >= 0);
if ((fd = open("/dev/null", flags|O_NOCTTY)) < 0)
return -errno;
if (nfd != fd) {
close_nointr_nofail(nfd);
return -EIO;
if (fd != nfd) {
r = dup2(fd, nfd) < 0 ? -errno : nfd;
close_nointr(fd);
} else
r = nfd;
return r;
}
static int connect_logger_as(const ExecContext *context, ExecOutput output, const char *ident, int nfd) {
int fd, r;
union {
struct sockaddr sa;
struct sockaddr_un un;
} sa;
assert(context);
assert(output < _EXEC_OUTPUT_MAX);
assert(ident);
assert(nfd >= 0);
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return -errno;
zero(sa);
sa.sa.sa_family = AF_UNIX;
strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
if (connect(fd, &sa.sa, sizeof(sa)) < 0) {
close_nointr_nofail(fd);
return -errno;
}
return 0;
if (shutdown(fd, SHUT_RD) < 0) {
close_nointr_nofail(fd);
return -errno;
}
/* We speak a very simple protocol between log server
* and client: one line for the log destination (kmsg
* or syslog), followed by the priority field,
* followed by the process name. Since we replaced
* stdin/stderr we simple use stdio to write to
* it. Note that we use stderr, to minimize buffer
* flushing issues. */
dprintf(fd,
"%s\n"
"%i\n"
"%s\n",
output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog",
context->syslog_priority,
context->syslog_identifier ? context->syslog_identifier : ident);
if (fd != nfd) {
r = dup2(fd, nfd) < 0 ? -errno : nfd;
close_nointr(fd);
} else
r = nfd;
return r;
}
static int open_terminal_as(const char *path, mode_t mode, int nfd) {
int fd, r;
assert(path);
assert(nfd >= 0);
if ((fd = open_terminal(path, mode | O_NOCTTY)) < 0)
return fd;
if (fd != nfd) {
r = dup2(fd, nfd) < 0 ? -errno : nfd;
close_nointr_nofail(fd);
} else
r = nfd;
return r;
}
static bool is_terminal_input(ExecInput i) {
return
i == EXEC_INPUT_TTY ||
i == EXEC_INPUT_TTY_FORCE ||
i == EXEC_INPUT_TTY_FAIL;
}
static int setup_input(const ExecContext *context) {
assert(context);
switch (context->std_input) {
case EXEC_INPUT_NULL:
return open_null_as(O_RDONLY, STDIN_FILENO);
case EXEC_INPUT_TTY:
case EXEC_INPUT_TTY_FORCE:
case EXEC_INPUT_TTY_FAIL: {
int fd, r;
if ((fd = acquire_terminal(
tty_path(context),
context->std_input == EXEC_INPUT_TTY_FAIL,
context->std_input == EXEC_INPUT_TTY_FORCE)) < 0)
return fd;
if (fd != STDIN_FILENO) {
r = dup2(fd, STDIN_FILENO) < 0 ? -errno : STDIN_FILENO;
close_nointr_nofail(fd);
} else
r = STDIN_FILENO;
return r;
}
default:
assert_not_reached("Unknown input type");
}
}
static int setup_output(const ExecContext *context, const char *ident) {
int r;
assert(context);
assert(ident);
switch (context->output) {
/* This expects the input is already set up */
switch (context->std_output) {
case EXEC_OUTPUT_INHERIT:
/* If the input is connected to a terminal, inherit that... */
if (is_terminal_input(context->std_input))
return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
case EXEC_OUTPUT_CONSOLE:
return 0;
case EXEC_OUTPUT_NULL:
return open_null_as(O_WRONLY, STDOUT_FILENO);
if ((r = replace_null_fd(STDOUT_FILENO, O_WRONLY)) < 0 ||
(r = replace_null_fd(STDERR_FILENO, O_WRONLY)) < 0)
return r;
case EXEC_OUTPUT_TTY: {
if (is_terminal_input(context->std_input))
return dup2(STDIN_FILENO, STDOUT_FILENO) < 0 ? -errno : STDOUT_FILENO;
return 0;
case EXEC_OUTPUT_KERNEL:
case EXEC_OUTPUT_SYSLOG: {
int fd;
union {
struct sockaddr sa;
struct sockaddr_un un;
} sa;
close_nointr(STDOUT_FILENO);
close_nointr(STDERR_FILENO);
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return -errno;
if (fd != STDOUT_FILENO) {
close_nointr_nofail(fd);
return -EIO;
}
zero(sa);
sa.sa.sa_family = AF_UNIX;
strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
if (connect(fd, &sa.sa, sizeof(sa)) < 0) {
close_nointr_nofail(fd);
return -errno;
}
if (shutdown(fd, SHUT_RD) < 0) {
close_nointr_nofail(fd);
return -errno;
}
if ((fd = dup(fd)) < 0) {
close_nointr_nofail(fd);
return -errno;
}
if (fd != STDERR_FILENO) {
close_nointr_nofail(fd);
return -EIO;
}
/* We speak a very simple protocol between log server
* and client: one line for the log destination (kmsg
* or syslog), followed by the priority field,
* followed by the process name. Since we replaced
* stdin/stderr we simple use stdio to write to
* it. Note that we use stderr, to minimize buffer
* flushing issues. */
fprintf(stderr,
"%s\n"
"%i\n"
"%s\n",
context->output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog",
context->syslog_priority,
context->syslog_identifier ? context->syslog_identifier : ident);
return 0;
/* We don't reset the terminal if this is just about output */
return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO);
}
case EXEC_OUTPUT_SYSLOG:
case EXEC_OUTPUT_KERNEL:
return connect_logger_as(context, context->std_output, ident, STDOUT_FILENO);
default:
assert_not_reached("Unknown output type");
}
}
static int setup_input(const ExecContext *context) {
int r;
static int setup_error(const ExecContext *context, const char *ident) {
assert(context);
switch (context->input) {
/* This expects the input and output are already set up */
case EXEC_INPUT_CONSOLE:
return 0;
/* Don't change the stderr file descriptor if we inherit all
* the way and are not on a tty */
if (context->std_error == EXEC_OUTPUT_INHERIT &&
context->std_output == EXEC_OUTPUT_INHERIT &&
!is_terminal_input(context->std_input))
return STDERR_FILENO;
case EXEC_INPUT_NULL:
if ((r = replace_null_fd(STDIN_FILENO, O_RDONLY)) < 0)
return r;
/* Duplicate form stdout if possible */
if (context->std_error == context->std_output ||
context->std_error == EXEC_OUTPUT_INHERIT)
return dup2(STDOUT_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
return 0;
switch (context->std_error) {
case EXEC_OUTPUT_NULL:
return open_null_as(O_WRONLY, STDERR_FILENO);
case EXEC_OUTPUT_TTY:
if (is_terminal_input(context->std_input))
return dup2(STDIN_FILENO, STDERR_FILENO) < 0 ? -errno : STDERR_FILENO;
/* We don't reset the terminal if this is just about output */
return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO);
case EXEC_OUTPUT_SYSLOG:
case EXEC_OUTPUT_KERNEL:
return connect_logger_as(context, context->std_error, ident, STDERR_FILENO);
default:
assert_not_reached("Unknown input type");
assert_not_reached("Unknown error type");
}
}
static int setup_confirm_stdio(const ExecContext *context,
int *_saved_stdin,
int *_saved_stdout) {
int fd = -1, saved_stdin, saved_stdout = -1, r;
assert(context);
assert(_saved_stdin);
assert(_saved_stdout);
/* This returns positive EXIT_xxx return values instead of
* negative errno style values! */
if ((saved_stdin = fcntl(STDIN_FILENO, F_DUPFD, 3)) < 0)
return EXIT_STDIN;
if ((saved_stdout = fcntl(STDOUT_FILENO, F_DUPFD, 3)) < 0) {
r = EXIT_STDOUT;
goto fail;
}
if ((fd = acquire_terminal(
tty_path(context),
context->std_input == EXEC_INPUT_TTY_FAIL,
context->std_input == EXEC_INPUT_TTY_FORCE)) < 0) {
r = EXIT_STDIN;
goto fail;
}
if (dup2(fd, STDIN_FILENO) < 0) {
r = EXIT_STDIN;
goto fail;
}
if (dup2(fd, STDOUT_FILENO) < 0) {
r = EXIT_STDOUT;
goto fail;
}
if (fd >= 2)
close_nointr_nofail(fd);
*_saved_stdin = saved_stdin;
*_saved_stdout = saved_stdout;
return 0;
fail:
if (saved_stdout >= 0)
close_nointr_nofail(saved_stdout);
if (saved_stdin >= 0)
close_nointr_nofail(saved_stdin);
if (fd >= 0)
close_nointr_nofail(fd);
return r;
}
static int restore_conform_stdio(const ExecContext *context,
int *saved_stdin,
int *saved_stdout,
bool *keep_stdin,
bool *keep_stdout) {
assert(context);
assert(saved_stdin);
assert(*saved_stdin >= 0);
assert(saved_stdout);
assert(*saved_stdout >= 0);
/* This returns positive EXIT_xxx return values instead of
* negative errno style values! */
if (is_terminal_input(context->std_input)) {
/* The service wants terminal input. */
*keep_stdin = true;
*keep_stdout =
context->std_output == EXEC_OUTPUT_INHERIT ||
context->std_output == EXEC_OUTPUT_TTY;
} else {
/* If the service doesn't want a controlling terminal,
* then we need to get rid entirely of what we have
* already. */
if (release_terminal() < 0)
return EXIT_STDIN;
if (dup2(*saved_stdin, STDIN_FILENO) < 0)
return EXIT_STDIN;
if (dup2(*saved_stdout, STDOUT_FILENO) < 0)
return EXIT_STDOUT;
*keep_stdout = *keep_stdin = false;
}
return 0;
}
static int get_group_creds(const char *groupname, gid_t *gid) {
struct group *g;
unsigned long lu;
@ -452,6 +642,7 @@ int exec_spawn(ExecCommand *command,
int *fds, unsigned n_fds,
bool apply_permissions,
bool apply_chroot,
bool confirm_spawn,
CGroupBonding *cgroup_bondings,
pid_t *ret) {
@ -485,6 +676,8 @@ int exec_spawn(ExecCommand *command,
gid_t gid = (gid_t) -1;
char **our_env = NULL, **final_env = NULL;
unsigned n_env = 0;
int saved_stdout = -1, saved_stdin = -1;
bool keep_stdout = false, keep_stdin = false;
/* child */
@ -494,27 +687,59 @@ int exec_spawn(ExecCommand *command,
goto fail;
}
if (context->new_session) {
if (setsid() < 0) {
r = EXIT_SETSID;
goto fail;
}
} else {
if (setpgid(0, 0) < 0) {
r = EXIT_PGID;
goto fail;
}
if (setsid() < 0) {
r = EXIT_SETSID;
goto fail;
}
umask(context->umask);
if (setup_input(context) < 0) {
r = EXIT_INPUT;
goto fail;
if (confirm_spawn) {
char response;
/* Set up terminal for the question */
if ((r = setup_confirm_stdio(context,
&saved_stdin, &saved_stdout)))
goto fail;
/* Now ask the question. */
if (!(line = exec_command_line(command))) {
r = EXIT_MEMORY;
goto fail;
}
r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line);
free(line);
if (r < 0 || response == 'n') {
r = EXIT_CONFIRM;
goto fail;
} else if (response == 's') {
r = 0;
goto fail;
}
/* Release terminal for the question */
if ((r = restore_conform_stdio(context,
&saved_stdin, &saved_stdout,
&keep_stdin, &keep_stdout)))
goto fail;
}
if (setup_output(context, file_name_from_path(command->path)) < 0) {
r = EXIT_OUTPUT;
if (!keep_stdin)
if (setup_input(context) < 0) {
r = EXIT_STDIN;
goto fail;
}
if (!keep_stdout)
if (setup_output(context, file_name_from_path(command->path)) < 0) {
r = EXIT_STDOUT;
goto fail;
}
if (setup_error(context, file_name_from_path(command->path)) < 0) {
r = EXIT_STDERR;
goto fail;
}
@ -697,9 +922,25 @@ int exec_spawn(ExecCommand *command,
strv_free(our_env);
strv_free(final_env);
if (saved_stdin >= 0)
close_nointr_nofail(saved_stdin);
if (saved_stdout >= 0)
close_nointr_nofail(saved_stdout);
_exit(r);
}
/* We add the new process to the cgroup both in the child (so
* that we can be sure that no user code is ever executed
* outside of the cgroup) and in the parent (so that we can be
* sure that when we kill the cgroup the process will be
* killed too). */
if (cgroup_bondings)
if ((r = cgroup_bonding_install_list(cgroup_bondings, pid)) < 0) {
r = EXIT_CGROUP;
goto fail;
}
log_debug("Forked %s as %llu", command->path, (unsigned long long) pid);
@ -730,10 +971,10 @@ void exec_context_init(ExecContext *c) {
c->cpu_sched_reset_on_fork = false;
c->non_blocking = false;
c->new_session = false;
c->input = 0;
c->output = 0;
c->std_input = 0;
c->std_output = 0;
c->std_error = 0;
c->syslog_priority = LOG_DAEMON|LOG_INFO;
c->secure_bits = 0;
@ -758,6 +999,9 @@ void exec_context_done(ExecContext *c) {
free(c->root_directory);
c->root_directory = NULL;
free(c->tty_path);
c->tty_path = NULL;
free(c->syslog_identifier);
c->syslog_identifier = NULL;
@ -826,13 +1070,11 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
"%sUMask: %04o\n"
"%sWorkingDirectory: %s\n"
"%sRootDirectory: %s\n"
"%sNonBlocking: %s\n"
"%sNewSession: %s\n",
"%sNonBlocking: %s\n",
prefix, c->umask,
prefix, c->working_directory ? c->working_directory : "/",
prefix, c->root_directory ? c->root_directory : "/",
prefix, yes_no(c->non_blocking),
prefix, yes_no(c->new_session));
prefix, yes_no(c->non_blocking));
if (c->environment)
for (e = c->environment; *e; e++)
@ -880,12 +1122,20 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns);
fprintf(f,
"%sInput: %s\n"
"%sOutput: %s\n",
prefix, exec_input_to_string(c->input),
prefix, exec_output_to_string(c->output));
"%sStandardInput: %s\n"
"%sStandardOutput: %s\n"
"%sStandardError: %s\n",
prefix, exec_input_to_string(c->std_input),
prefix, exec_output_to_string(c->std_output),
prefix, exec_output_to_string(c->std_error));
if (c->output == EXEC_OUTPUT_SYSLOG || c->output == EXEC_OUTPUT_KERNEL)
if (c->tty_path)
fprintf(f,
"%sTTYPath: %s\n",
prefix, c->tty_path);
if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KERNEL ||
c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KERNEL)
fprintf(f,
"%sSyslogFacility: %s\n"
"%sSyslogLevel: %s\n",
@ -1104,18 +1354,122 @@ int exec_command_set(ExecCommand *c, const char *path, ...) {
return 0;
}
const char* exit_status_to_string(ExitStatus status) {
switch (status) {
case EXIT_SUCCESS:
return "SUCCESS";
case EXIT_FAILURE:
return "FAILURE";
case EXIT_INVALIDARGUMENT:
return "INVALIDARGUMENT";
case EXIT_NOTIMPLEMENTED:
return "NOTIMPLEMENTED";
case EXIT_NOPERMISSION:
return "NOPERMISSION";
case EXIT_NOTINSTALLED:
return "NOTINSSTALLED";
case EXIT_NOTCONFIGURED:
return "NOTCONFIGURED";
case EXIT_NOTRUNNING:
return "NOTRUNNING";
case EXIT_CHDIR:
return "CHDIR";
case EXIT_NICE:
return "NICE";
case EXIT_FDS:
return "FDS";
case EXIT_EXEC:
return "EXEC";
case EXIT_MEMORY:
return "MEMORY";
case EXIT_LIMITS:
return "LIMITS";
case EXIT_OOM_ADJUST:
return "OOM_ADJUST";
case EXIT_SIGNAL_MASK:
return "SIGNAL_MASK";
case EXIT_STDIN:
return "STDIN";
case EXIT_STDOUT:
return "STDOUT";
case EXIT_CHROOT:
return "CHROOT";
case EXIT_IOPRIO:
return "IOPRIO";
case EXIT_TIMERSLACK:
return "TIMERSLACK";
case EXIT_SECUREBITS:
return "SECUREBITS";
case EXIT_SETSCHEDULER:
return "SETSCHEDULER";
case EXIT_CPUAFFINITY:
return "CPUAFFINITY";
case EXIT_GROUP:
return "GROUP";
case EXIT_USER:
return "USER";
case EXIT_CAPABILITIES:
return "CAPABILITIES";
case EXIT_CGROUP:
return "CGROUP";
case EXIT_SETSID:
return "SETSID";
case EXIT_CONFIRM:
return "CONFIRM";
case EXIT_STDERR:
return "STDERR";
default:
return NULL;
}
}
static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
[EXEC_INPUT_NULL] = "null",
[EXEC_INPUT_TTY] = "tty",
[EXEC_INPUT_TTY_FORCE] = "tty-force",
[EXEC_INPUT_TTY_FAIL] = "tty-fail"
};
static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
[EXEC_OUTPUT_CONSOLE] = "console",
[EXEC_OUTPUT_INHERIT] = "inherit",
[EXEC_OUTPUT_NULL] = "null",
[EXEC_OUTPUT_TTY] = "tty",
[EXEC_OUTPUT_SYSLOG] = "syslog",
[EXEC_OUTPUT_KERNEL] = "kernel"
};
DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
[EXEC_INPUT_NULL] = "null",
[EXEC_INPUT_CONSOLE] = "console"
};
DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);

43
execute.h
View File

@ -41,22 +41,25 @@ struct CGroupBonding;
/* Abstract namespace! */
#define LOGGER_SOCKET "/org/freedesktop/systemd1/logger"
typedef enum ExecInput {
EXEC_INPUT_NULL,
EXEC_INPUT_TTY,
EXEC_INPUT_TTY_FORCE,
EXEC_INPUT_TTY_FAIL,
_EXEC_INPUT_MAX,
_EXEC_INPUT_INVALID = -1
} ExecInput;
typedef enum ExecOutput {
EXEC_OUTPUT_CONSOLE,
EXEC_OUTPUT_INHERIT,
EXEC_OUTPUT_NULL,
EXEC_OUTPUT_TTY,
EXEC_OUTPUT_SYSLOG,
EXEC_OUTPUT_KERNEL,
_EXEC_OUTPUT_MAX,
_EXEC_OUTPUT_INVALID = -1
} ExecOutput;
typedef enum ExecInput {
EXEC_INPUT_NULL,
EXEC_INPUT_CONSOLE,
_EXEC_INPUT_MAX,
_EXEC_INPUT_INVALID = -1
} ExecInput;
struct ExecStatus {
pid_t pid;
usec_t start_timestamp;
@ -94,10 +97,13 @@ struct ExecContext {
bool cpu_sched_reset_on_fork;
bool non_blocking;
bool new_session;
ExecInput input;
ExecOutput output;
ExecInput std_input;
ExecOutput std_output;
ExecOutput std_error;
char *tty_path;
int syslog_priority;
char *syslog_identifier;
@ -138,10 +144,9 @@ typedef enum ExitStatus {
EXIT_LIMITS,
EXIT_OOM_ADJUST,
EXIT_SIGNAL_MASK,
EXIT_INPUT,
EXIT_OUTPUT,
EXIT_STDIN,
EXIT_STDOUT,
EXIT_CHROOT, /* 210 */
EXIT_PGID,
EXIT_IOPRIO,
EXIT_TIMERSLACK,
EXIT_SECUREBITS,
@ -150,8 +155,11 @@ typedef enum ExitStatus {
EXIT_GROUP,
EXIT_USER,
EXIT_CAPABILITIES,
EXIT_CGROUP, /* 220 */
EXIT_SETSID
EXIT_CGROUP,
EXIT_SETSID, /* 220 */
EXIT_CONFIRM,
EXIT_STDERR
} ExitStatus;
int exec_spawn(ExecCommand *command,
@ -159,6 +167,7 @@ int exec_spawn(ExecCommand *command,
int *fds, unsigned n_fds,
bool apply_permissions,
bool apply_chroot,
bool confirm_spawn,
struct CGroupBonding *cgroup_bondings,
pid_t *ret);
@ -187,4 +196,6 @@ int exec_output_from_string(const char *s);
const char* exec_input_to_string(ExecInput i);
int exec_input_from_string(const char *s);
const char* exit_status_to_string(ExitStatus status);
#endif

9
load-fragment.c
View File

@ -1227,8 +1227,10 @@ static int load_from_path(Unit *u, const char *path) {
{ "CPUAffinity", config_parse_cpu_affinity, &(context), section }, \
{ "UMask", config_parse_mode, &(context).umask, section }, \
{ "Environment", config_parse_strv, &(context).environment, section }, \
{ "Output", config_parse_output, &(context).output, section }, \
{ "Input", config_parse_input, &(context).input, section }, \
{ "StandardInput", config_parse_input, &(context).std_input, section }, \
{ "StandardOutput", config_parse_output, &(context).std_output, section }, \
{ "StandardError", config_parse_output, &(context).std_output, section }, \
{ "TTYPath", config_parse_path, &(context).tty_path, section }, \
{ "SyslogIdentifier", config_parse_string, &(context).syslog_identifier, section }, \
{ "SyslogFacility", config_parse_facility, &(context).syslog_priority, section }, \
{ "SyslogLevel", config_parse_level, &(context).syslog_priority, section }, \
@ -1252,8 +1254,7 @@ static int load_from_path(Unit *u, const char *path) {
{ "LimitNICE", config_parse_limit, &(context).rlimit[RLIMIT_NICE], section }, \
{ "LimitRTPRIO", config_parse_limit, &(context).rlimit[RLIMIT_RTPRIO], section }, \
{ "LimitRTTIME", config_parse_limit, &(context).rlimit[RLIMIT_RTTIME], section }, \
{ "ControlGroup", config_parse_cgroup, u, section }, \
{ "NewSession", config_parse_bool, &(context).new_session, section }
{ "ControlGroup", config_parse_cgroup, u, section }
const ConfigItem items[] = {
{ "Names", config_parse_names, u, "Meta" },

76
main.c
View File

@ -30,6 +30,7 @@
#include <getopt.h>
#include <signal.h>
#include <sys/wait.h>
#include <fcntl.h>
#include "manager.h"
#include "log.h"
@ -51,6 +52,8 @@ static bool dump_core = true;
static bool crash_shell = false;
static int crash_chvt = -1;
static bool confirm_spawn = false;
_noreturn static void freeze(void) {
for (;;)
pause();
@ -134,6 +137,53 @@ static void install_crash_handler(void) {
assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
}
static int console_setup(void) {
int tty_fd = -1, null_fd = -1, r = 0;
/* If we are init, we connect stdout/stderr to /dev/console
* and stdin to /dev/null and make sure we don't have a
* controlling tty. */
release_terminal();
if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
r = -tty_fd;
goto finish;
}
if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
log_error("Failed to open /dev/null: %m");
r = -errno;
goto finish;
}
assert(tty_fd >= 3);
assert(null_fd >= 3);
if (reset_terminal(tty_fd) < 0)
log_error("Failed to reset /dev/console: %m");
if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
dup2(tty_fd, STDERR_FILENO) < 0 ||
dup2(null_fd, STDIN_FILENO) < 0) {
log_error("Failed to dup2() device: %m");
r = -errno;
goto finish;
}
r = 0;
finish:
if (tty_fd >= 0)
close_nointr(tty_fd);
if (null_fd >= 0)
close_nointr(null_fd);
return r;
}
static int set_default_unit(const char *u) {
char *c;
@ -264,7 +314,8 @@ static int parse_argv(int argc, char *argv[]) {
ARG_DEFAULT,
ARG_RUNNING_AS,
ARG_TEST,
ARG_DUMP_CONFIGURATION_ITEMS
ARG_DUMP_CONFIGURATION_ITEMS,
ARG_CONFIRM_SPAWN
};
static const struct option options[] = {
@ -275,6 +326,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "test", no_argument, NULL, ARG_TEST },
{ "help", no_argument, NULL, 'h' },
{ "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
{ "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
{ NULL, 0, NULL, 0 }
};
@ -333,6 +385,10 @@ static int parse_argv(int argc, char *argv[]) {
action = ACTION_DUMP_CONFIGURATION_ITEMS;
break;
case ARG_CONFIRM_SPAWN:
confirm_spawn = true;
break;
case 'h':
action = ACTION_HELP;
break;
@ -357,7 +413,8 @@ static int help(void) {
" --log-target=TARGET Set log target (console, syslog, kmsg)\n"
" --running-as=AS Set running as (init, system, session)\n"
" --test Determine startup sequence, dump it and exit\n"
" --dump-configuration-items Dump understood unit configuration items\n",
" --dump-configuration-items Dump understood unit configuration items\n"
" --confirm-spawn Ask for confirmation when spawning processes\n",
__progname);
return 0;
@ -422,11 +479,16 @@ int main(int argc, char *argv[]) {
/* Move out of the way, so that we won't block unmounts */
assert_se(chdir("/") == 0);
/* Become a session leader if we aren't one yet. */
setsid();
if (running_as != MANAGER_SESSION) {
/* Become a session leader if we aren't one yet. */
setsid();
/* Disable the umask logic */
umask(0);
/* Disable the umask logic */
umask(0);
}
if (running_as == MANAGER_INIT)
console_setup();
/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
dbus_connection_set_change_sigpipe(FALSE);
@ -445,7 +507,7 @@ int main(int argc, char *argv[]) {
if (running_as == MANAGER_INIT)
hostname_setup();
if ((r = manager_new(running_as, &m)) < 0) {
if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
log_error("Failed to allocate manager object: %s", strerror(-r));
goto finish;
}

44
manager.c
View File

@ -33,6 +33,8 @@
#include <sys/ioctl.h>
#include <linux/kd.h>
#include <libcgroup.h>
#include <termios.h>
#include <fcntl.h>
#include "manager.h"
#include "hashmap.h"
@ -45,6 +47,28 @@
#include "mount-setup.h"
#include "utmp-wtmp.h"
static int enable_special_signals(Manager *m) {
char fd;
assert(m);
/* Enable that we get SIGINT on control-alt-del */
if (reboot(RB_DISABLE_CAD) < 0)
log_warning("Failed to enable ctrl-alt-del handling: %m");
if ((fd = open_terminal("/dev/tty0", O_RDWR)) < 0)
log_warning("Failed to open /dev/tty0: %m");
else {
/* Enable that we get SIGWINCH on kbrequest */
if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
close_nointr_nofail(fd);
}
return 0;
}
static int manager_setup_signals(Manager *m) {
sigset_t mask;
struct epoll_event ev;
@ -73,15 +97,8 @@ static int manager_setup_signals(Manager *m) {
if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->signal_watch.fd, &ev) < 0)
return -errno;
if (m->running_as == MANAGER_INIT) {
/* Enable that we get SIGINT on control-alt-del */
if (reboot(RB_DISABLE_CAD) < 0)
log_warning("Failed to enable ctrl-alt-del handling: %s", strerror(errno));
/* Enable that we get SIGWINCH on kbrequest */
if (ioctl(0, KDSIGACCEPT, SIGWINCH) < 0)
log_warning("Failed to enable kbrequest handling: %s", strerror(errno));
}
if (m->running_as == MANAGER_INIT)
return enable_special_signals(m);
return 0;
}
@ -280,7 +297,7 @@ static int manager_find_paths(Manager *m) {
return 0;
}
int manager_new(ManagerRunningAs running_as, Manager **_m) {
int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **_m) {
Manager *m;
int r = -ENOMEM;
@ -294,6 +311,8 @@ int manager_new(ManagerRunningAs running_as, Manager **_m) {
m->boot_timestamp = now(CLOCK_REALTIME);
m->running_as = running_as;
m->confirm_spawn = confirm_spawn;
m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = -1;
m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
@ -1553,13 +1572,8 @@ static int manager_process_signal_fd(Manager *m, bool *quit) {
break;
case SIGUSR1:
printf("→ By units:\n");
manager_dump_units(m, stdout, "\t");
printf("→ By jobs:\n");
manager_dump_jobs(m, stdout, "\t");
break;
default:

6
manager.h
View File

@ -35,7 +35,7 @@ typedef struct Watch Watch;
typedef enum ManagerRunningAs {
MANAGER_INIT, /* root and pid=1 */
MANAGER_SYSTEM, /* root and pid!=1 */
MANAGER_SESSION, /* non-root */
MANAGER_SESSION, /* non-root, for a session */
_MANAGER_RUNNING_AS_MAX,
_MANAGER_RUNNING_AS_INVALID = -1
} ManagerRunningAs;
@ -152,6 +152,8 @@ struct Manager {
bool utmp_reboot_written:1;
bool confirm_spawn:1;
Hashmap *watch_pids; /* pid => Unit object n:1 */
int epoll_fd;
@ -183,7 +185,7 @@ struct Manager {
usec_t boot_timestamp;
};
int manager_new(ManagerRunningAs running_as, Manager **m);
int manager_new(ManagerRunningAs running_as, bool confirm_spawn, Manager **m);
void manager_free(Manager *m);
int manager_coldplug(Manager *m);

46
mount.c
View File

@ -367,6 +367,7 @@ static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
NULL, 0,
true,
true,
UNIT(m)->meta.manager->confirm_spawn,
UNIT(m)->meta.cgroup_bondings,
&pid)) < 0)
goto fail;
@ -436,21 +437,28 @@ static void mount_enter_dead(Mount *m, bool success) {
mount_set_state(m, m->failure ? MOUNT_MAINTAINANCE : MOUNT_DEAD);
}
static void mount_enter_mounted(Mount *m, bool success) {
assert(m);
if (!success)
m->failure = true;
mount_set_state(m, MOUNT_MOUNTED);
}
static void mount_enter_signal(Mount *m, MountState state, bool success) {
int r;
bool sent = false;
assert(m);
if (!success)
m->failure = true;
if (m->control_pid > 0) {
int sig;
bool sent = false;
sig = (state == MOUNT_MOUNTING_SIGTERM ||
state == MOUNT_UNMOUNTING_SIGTERM ||
state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
if (m->kill_mode != KILL_NONE) {
int sig = (state == MOUNT_MOUNTING_SIGTERM ||
state == MOUNT_UNMOUNTING_SIGTERM ||
state == MOUNT_REMOUNTING_SIGTERM) ? SIGTERM : SIGKILL;
if (m->kill_mode == KILL_CONTROL_GROUP) {
@ -461,32 +469,32 @@ static void mount_enter_signal(Mount *m, MountState state, bool success) {
sent = true;
}
if (!sent)
if (!sent && m->control_pid > 0)
if (kill(m->kill_mode == KILL_PROCESS ? m->control_pid : -m->control_pid, sig) < 0 && errno != ESRCH) {
r = -errno;
goto fail;
}
}
mount_set_state(m, state);
if (sent) {
if ((r = unit_watch_timer(UNIT(m), m->timeout_usec, &m->timer_watch)) < 0)
goto fail;
if (m->control_pid <= 0)
mount_set_state(m, state);
} else if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
mount_enter_mounted(m, true);
else
mount_enter_dead(m, true);
return;
fail:
log_warning("%s failed to kill processes: %s", unit_id(UNIT(m)), strerror(-r));
mount_enter_dead(m, false);
}
static void mount_enter_mounted(Mount *m, bool success) {
assert(m);
if (!success)
m->failure = true;
mount_set_state(m, MOUNT_MOUNTED);
if (state == MOUNT_REMOUNTING_SIGTERM || state == MOUNT_REMOUNTING_SIGKILL)
mount_enter_mounted(m, false);
else
mount_enter_dead(m, false);
}
static void mount_enter_unmounting(Mount *m, bool success) {

218
service.c
View File

@ -52,6 +52,7 @@ static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = {
[SERVICE_START] = UNIT_ACTIVATING,
[SERVICE_START_POST] = UNIT_ACTIVATING,
[SERVICE_RUNNING] = UNIT_ACTIVE,
[SERVICE_EXITED] = UNIT_ACTIVE,
[SERVICE_RELOAD] = UNIT_ACTIVE_RELOADING,
[SERVICE_STOP] = UNIT_DEACTIVATING,
[SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING,
@ -619,6 +620,9 @@ static int service_load_sysv_path(Service *s, const char *path) {
goto finish;
}
/* Special setting for all SysV services */
s->valid_no_process = true;
u->meta.load_state = UNIT_LOADED;
r = 0;
@ -1097,6 +1101,7 @@ static int service_spawn(
fds, n_fds,
apply_permissions,
apply_chroot,
UNIT(s)->meta.manager->confirm_spawn,
UNIT(s)->meta.cgroup_bondings,
&pid)) < 0)
goto fail;
@ -1119,6 +1124,41 @@ fail:
return r;
}
static int main_pid_good(Service *s) {
assert(s);
/* Returns 0 if the pid is dead, 1 if it is good, -1 if we
* don't know */
/* If we know the pid file, then lets just check if it is
* still valid */
if (s->main_pid_known)
return s->main_pid > 0;
/* We don't know the pid */
return -EAGAIN;
}
static int control_pid_good(Service *s) {
assert(s);
return s->control_pid > 0;
}
static int cgroup_good(Service *s) {
int r;
assert(s);
if (s->valid_no_process)
return -EAGAIN;
if ((r = cgroup_bonding_is_empty_list(UNIT(s)->meta.cgroup_bondings)) < 0)
return r;
return !r;
}
static void service_enter_dead(Service *s, bool success, bool allow_restart) {
int r;
assert(s);
@ -1155,7 +1195,7 @@ static void service_enter_stop_post(Service *s, bool success) {
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST]))
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST])) {
if ((r = service_spawn(s,
s->control_command,
true,
@ -1166,15 +1206,14 @@ static void service_enter_stop_post(Service *s, bool success) {
goto fail;
service_set_state(s, SERVICE_STOP_POST);
if (!s->control_command)
service_enter_dead(s, true, true);
service_set_state(s, SERVICE_STOP_POST);
} else
service_enter_signal(s, SERVICE_FINAL_SIGTERM, true);
return;
fail:
log_warning("%s failed to run stop executable: %s", unit_id(UNIT(s)), strerror(-r));
log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
}
@ -1187,10 +1226,8 @@ static void service_enter_signal(Service *s, ServiceState state, bool success) {
if (!success)
s->failure = true;
if (s->main_pid > 0 || s->control_pid > 0) {
int sig;
sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
if (s->kill_mode != KILL_NONE) {
int sig = (state == SERVICE_STOP_SIGTERM || state == SERVICE_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
if (s->kill_mode == KILL_CONTROL_GROUP) {
@ -1203,6 +1240,7 @@ static void service_enter_signal(Service *s, ServiceState state, bool success) {
if (!sent) {
r = 0;
if (s->main_pid > 0) {
if (kill(s->kill_mode == KILL_PROCESS ? s->main_pid : -s->main_pid, sig) < 0 && errno != ESRCH)
r = -errno;
@ -1222,9 +1260,14 @@ static void service_enter_signal(Service *s, ServiceState state, bool success) {
}
}
service_set_state(s, state);
if (sent) {
if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
goto fail;
if (s->main_pid <= 0 && s->control_pid <= 0)
service_set_state(s, state);
} else if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
service_enter_stop_post(s, true);
else
service_enter_dead(s, true, true);
return;
@ -1232,10 +1275,7 @@ static void service_enter_signal(Service *s, ServiceState state, bool success) {
fail:
log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
if (sent) {
s->failure = true;
service_set_state(s, state);
} else if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
if (state == SERVICE_STOP_SIGTERM || state == SERVICE_STOP_SIGKILL)
service_enter_stop_post(s, false);
else
service_enter_dead(s, false, true);
@ -1250,7 +1290,7 @@ static void service_enter_stop(Service *s, bool success) {
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP]))
if ((s->control_command = s->exec_command[SERVICE_EXEC_STOP])) {
if ((r = service_spawn(s,
s->control_command,
true,
@ -1260,9 +1300,8 @@ static void service_enter_stop(Service *s, bool success) {
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_STOP);
if (!s->control_command)
service_set_state(s, SERVICE_STOP);
} else
service_enter_signal(s, SERVICE_STOP_SIGTERM, true);
return;
@ -1272,13 +1311,27 @@ fail:
service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
}
static void service_enter_running(Service *s, bool success) {
assert(s);
if (!success)
s->failure = true;
if (main_pid_good(s) != 0 && cgroup_good(s) != 0)
service_set_state(s, SERVICE_RUNNING);
else if (s->valid_no_process)
service_set_state(s, SERVICE_EXITED);
else
service_enter_stop(s, true);
}
static void service_enter_start_post(Service *s) {
int r;
assert(s);
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_POST]))
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_POST])) {
if ((r = service_spawn(s,
s->control_command,
true,
@ -1289,10 +1342,9 @@ static void service_enter_start_post(Service *s) {
goto fail;
service_set_state(s, SERVICE_START_POST);
if (!s->control_command)
service_set_state(s, SERVICE_RUNNING);
service_set_state(s, SERVICE_START_POST);
} else
service_enter_running(s, true);
return;
@ -1310,6 +1362,11 @@ static void service_enter_start(Service *s) {
assert(s->exec_command[SERVICE_EXEC_START]);
assert(!s->exec_command[SERVICE_EXEC_START]->command_next);
if (s->type == SERVICE_FORKING)
service_unwatch_control_pid(s);
else
service_unwatch_main_pid(s);
if ((r = service_spawn(s,
s->exec_command[SERVICE_EXEC_START],
s->type == SERVICE_FORKING,
@ -1319,16 +1376,13 @@ static void service_enter_start(Service *s) {
&pid)) < 0)
goto fail;
service_set_state(s, SERVICE_START);
if (s->type == SERVICE_SIMPLE) {
/* For simple services we immediately start
* the START_POST binaries. */
service_unwatch_main_pid(s);
s->main_pid = pid;
s->main_pid_known = true;
service_enter_start_post(s);
} else if (s->type == SERVICE_FORKING) {
@ -1336,20 +1390,21 @@ static void service_enter_start(Service *s) {
/* For forking services we wait until the start
* process exited. */
service_unwatch_control_pid(s);
s->control_pid = pid;
s->control_command = s->exec_command[SERVICE_EXEC_START];
service_set_state(s, SERVICE_START);
} else if (s->type == SERVICE_FINISH) {
/* For finishing services we wait until the start
* process exited, too, but it is our main process. */
service_unwatch_main_pid(s);
s->main_pid = pid;
s->main_pid_known = true;
s->control_command = s->exec_command[SERVICE_EXEC_START];
service_set_state(s, SERVICE_START);
} else
assert_not_reached("Unknown service type");
@ -1357,7 +1412,7 @@ static void service_enter_start(Service *s) {
fail:
log_warning("%s failed to run start exectuable: %s", unit_id(UNIT(s)), strerror(-r));
service_enter_stop(s, false);
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
}
static void service_enter_start_pre(Service *s) {
@ -1367,7 +1422,7 @@ static void service_enter_start_pre(Service *s) {
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_PRE]))
if ((s->control_command = s->exec_command[SERVICE_EXEC_START_PRE])) {
if ((r = service_spawn(s,
s->control_command,
true,
@ -1377,9 +1432,8 @@ static void service_enter_start_pre(Service *s) {
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_START_PRE);
if (!s->control_command)
service_set_state(s, SERVICE_START_PRE);
} else
service_enter_start(s);
return;
@ -1413,7 +1467,7 @@ static void service_enter_reload(Service *s) {
service_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SERVICE_EXEC_RELOAD]))
if ((s->control_command = s->exec_command[SERVICE_EXEC_RELOAD])) {
if ((r = service_spawn(s,
s->control_command,
true,
@ -1423,10 +1477,9 @@ static void service_enter_reload(Service *s) {
&s->control_pid)) < 0)
goto fail;
service_set_state(s, SERVICE_RELOAD);
if (!s->control_command)
service_set_state(s, SERVICE_RUNNING);
service_set_state(s, SERVICE_RELOAD);
} else
service_enter_running(s, true);
return;
@ -1463,8 +1516,10 @@ static void service_run_next(Service *s, bool success) {
fail:
log_warning("%s failed to run spawn next executable: %s", unit_id(UNIT(s)), strerror(-r));
if (s->state == SERVICE_STOP)
service_enter_stop_post(s, false);
if (s->state == SERVICE_START_PRE)
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
else if (s->state == SERVICE_STOP)
service_enter_signal(s, SERVICE_STOP_SIGTERM, false);
else if (s->state == SERVICE_STOP_POST)
service_enter_dead(s, false, true);
else
@ -1533,7 +1588,7 @@ static int service_stop(Unit *u) {
return 0;
}
assert(s->state == SERVICE_RUNNING);
assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
service_enter_stop(s, true);
return 0;
@ -1544,7 +1599,7 @@ static int service_reload(Unit *u) {
assert(s);
assert(s->state == SERVICE_RUNNING);
assert(s->state == SERVICE_RUNNING || s->state == SERVICE_EXITED);
service_enter_reload(s);
return 0;
@ -1564,36 +1619,6 @@ static UnitActiveState service_active_state(Unit *u) {
return state_translation_table[SERVICE(u)->state];
}
static int main_pid_good(Service *s) {
assert(s);
/* Returns 0 if the pid is dead, 1 if it is good, -1 if we
* don't know */
/* If we know the pid file, then lets just check if it is
* still valid */
if (s->main_pid_known)
return s->main_pid > 0;
/* We don't know the pid */
return -EAGAIN;
}
static bool control_pid_good(Service *s) {
assert(s);
return s->control_pid > 0;
}
static int cgroup_good(Service *s) {
assert(s);
if (s->valid_no_process)
return -EAGAIN;
return cgroup_bonding_is_empty_list(UNIT(s)->meta.cgroup_bondings);
}
static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
Service *s = SERVICE(u);
bool success;
@ -1635,11 +1660,11 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
if (success)
service_enter_start_post(s);
else
service_enter_stop(s, false);
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_RUNNING:
service_enter_stop(s, success);
service_enter_running(s, success);
break;
case SERVICE_STOP_SIGTERM:
@ -1666,15 +1691,15 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
/* If we are shutting things down anyway we
* don't care about failing commands. */
if (s->control_command->command_next &&
(success || (s->state == SERVICE_STOP || s->state == SERVICE_STOP_POST)))
if (s->control_command->command_next && success) {
/* There is another command to *
* execute, so let's do that. */
log_debug("%s running next command for state %s", unit_id(u), service_state_to_string(s->state));
service_run_next(s, success);
else {
} else {
/* No further commands for this step, so let's
* figure out what to do next */
@ -1686,7 +1711,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
if (success)
service_enter_start(s);
else
service_enter_stop(s, false);
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_START:
@ -1705,7 +1730,7 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
service_enter_start_post(s);
} else
service_enter_stop(s, false);
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
@ -1725,22 +1750,15 @@ static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) {
/* Fall through */
case SERVICE_RELOAD:
if (success) {
if (main_pid_good(s) != 0 && cgroup_good(s) != 0)
service_set_state(s, SERVICE_RUNNING);
else
service_enter_stop(s, true);
} else
if (success)
service_enter_running(s, true);
else
service_enter_stop(s, false);
break;
case SERVICE_STOP:
if (main_pid_good(s) > 0)
/* Still not dead and we know the PID? Let's go hunting. */
service_enter_signal(s, SERVICE_STOP_SIGTERM, success);
else
service_enter_stop_post(s, success);
service_enter_signal(s, SERVICE_STOP_SIGTERM, success);
break;
case SERVICE_STOP_SIGTERM:
@ -1779,6 +1797,10 @@ static void service_timer_event(Unit *u, uint64_t elapsed, Watch* w) {
case SERVICE_START_PRE:
case SERVICE_START:
log_warning("%s operation timed out. Terminating.", unit_id(u));
service_enter_signal(s, SERVICE_FINAL_SIGTERM, false);
break;
case SERVICE_START_POST:
case SERVICE_RELOAD:
log_warning("%s operation timed out. Stopping.", unit_id(u));
@ -1845,10 +1867,7 @@ static void service_cgroup_notify_event(Unit *u) {
* SIGCHLD for. */
case SERVICE_RUNNING:
if (!s->valid_no_process && main_pid_good(s) <= 0)
service_enter_stop(s, true);
service_enter_running(s, true);
break;
default:
@ -1970,6 +1989,7 @@ static const char* const service_state_table[_SERVICE_STATE_MAX] = {
[SERVICE_START] = "start",
[SERVICE_START_POST] = "start-post",
[SERVICE_RUNNING] = "running",
[SERVICE_EXITED] = "exited",
[SERVICE_RELOAD] = "reload",
[SERVICE_STOP] = "stop",
[SERVICE_STOP_SIGTERM] = "stop-sigterm",

1
service.h
View File

@ -33,6 +33,7 @@ typedef enum ServiceState {
SERVICE_START,
SERVICE_START_POST,
SERVICE_RUNNING,
SERVICE_EXITED, /* Nothing is running anymore, but ValidNoProcess is true, ehnce this is OK */
SERVICE_RELOAD,
SERVICE_STOP, /* No STOP_PRE state, instead just register multiple STOP executables */
SERVICE_STOP_SIGTERM,

106
socket.c
View File

@ -43,8 +43,8 @@ static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
[SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
[SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
[SOCKET_STOP_POST] = UNIT_DEACTIVATING,
[SOCKET_STOP_POST_SIGTERM] = UNIT_DEACTIVATING,
[SOCKET_STOP_POST_SIGKILL] = UNIT_DEACTIVATING,
[SOCKET_FINAL_SIGTERM] = UNIT_DEACTIVATING,
[SOCKET_FINAL_SIGKILL] = UNIT_DEACTIVATING,
[SOCKET_MAINTAINANCE] = UNIT_INACTIVE,
};
@ -58,8 +58,8 @@ static const char* const state_string_table[_SOCKET_STATE_MAX] = {
[SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
[SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
[SOCKET_STOP_POST] = "stop-post",
[SOCKET_STOP_POST_SIGTERM] = "stop-post-sigterm",
[SOCKET_STOP_POST_SIGKILL] = "stop-post-sigkill",
[SOCKET_FINAL_SIGTERM] = "final-sigterm",
[SOCKET_FINAL_SIGKILL] = "final-sigkill",
[SOCKET_MAINTAINANCE] = "maintainance"
};
@ -365,8 +365,8 @@ static void socket_set_state(Socket *s, SocketState state) {
state != SOCKET_STOP_PRE_SIGTERM &&
state != SOCKET_STOP_PRE_SIGKILL &&
state != SOCKET_STOP_POST &&
state != SOCKET_STOP_POST_SIGTERM &&
state != SOCKET_STOP_POST_SIGKILL) {
state != SOCKET_FINAL_SIGTERM &&
state != SOCKET_FINAL_SIGKILL) {
unit_unwatch_timer(UNIT(s), &s->timer_watch);
socket_unwatch_control_pid(s);
s->control_command = NULL;
@ -405,6 +405,7 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
NULL, 0,
true,
true,
UNIT(s)->meta.manager->confirm_spawn,
UNIT(s)->meta.cgroup_bondings,
&pid)) < 0)
goto fail;
@ -432,6 +433,8 @@ static void socket_enter_dead(Socket *s, bool success) {
socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
}
static void socket_enter_signal(Socket *s, SocketState state, bool success);
static void socket_enter_stop_post(Socket *s, bool success) {
int r;
assert(s);
@ -441,35 +444,32 @@ static void socket_enter_stop_post(Socket *s, bool success) {
socket_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST]))
if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
goto fail;
socket_set_state(s, SOCKET_STOP_POST);
if (!s->control_command)
socket_enter_dead(s, true);
socket_set_state(s, SOCKET_STOP_POST);
} else
socket_enter_signal(s, SOCKET_FINAL_SIGTERM, true);
return;
fail:
log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
socket_enter_dead(s, false);
socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
}
static void socket_enter_signal(Socket *s, SocketState state, bool success) {
int r;
bool sent = false;
assert(s);
if (!success)
s->failure = true;
if (s->control_pid > 0) {
int sig;
bool sent = false;
sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_POST_SIGTERM) ? SIGTERM : SIGKILL;
if (s->kill_mode != KILL_NONE) {
int sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_FINAL_SIGTERM) ? SIGTERM : SIGKILL;
if (s->kill_mode == KILL_CONTROL_GROUP) {
@ -480,16 +480,21 @@ static void socket_enter_signal(Socket *s, SocketState state, bool success) {
sent = true;
}
if (!sent)
if (!sent && s->control_pid > 0)
if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
r = -errno;
goto fail;
}
}
socket_set_state(s, state);
if (sent) {
if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
goto fail;
if (s->control_pid <= 0)
socket_set_state(s, state);
} else if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
socket_enter_stop_post(s, true);
else
socket_enter_dead(s, true);
return;
@ -512,13 +517,12 @@ static void socket_enter_stop_pre(Socket *s, bool success) {
socket_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE]))
if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
goto fail;
socket_set_state(s, SOCKET_STOP_PRE);
if (!s->control_command)
socket_set_state(s, SOCKET_STOP_PRE);
} else
socket_enter_stop_post(s, true);
return;
@ -555,15 +559,14 @@ static void socket_enter_start_post(Socket *s) {
socket_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST]))
if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
goto fail;
}
socket_set_state(s, SOCKET_START_POST);
if (!s->control_command)
socket_set_state(s, SOCKET_START_POST);
} else
socket_enter_listening(s);
return;
@ -578,13 +581,12 @@ static void socket_enter_start_pre(Socket *s) {
socket_unwatch_control_pid(s);
if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE]))
if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
goto fail;
socket_set_state(s, SOCKET_START_PRE);
if (!s->control_command)
socket_set_state(s, SOCKET_START_PRE);
} else
socket_enter_start_post(s);
return;
@ -607,7 +609,7 @@ static void socket_enter_running(Socket *s) {
fail:
log_warning("%s failed to queue socket startup job: %s", unit_id(UNIT(s)), strerror(-r));
socket_enter_dead(s, false);
socket_enter_stop_pre(s, false);
}
static void socket_run_next(Socket *s, bool success) {
@ -630,12 +632,14 @@ static void socket_run_next(Socket *s, bool success) {
return;
fail:
if (s->state == SOCKET_STOP_PRE)
socket_enter_stop_post(s, false);
log_warning("%s failed to run spawn next executable: %s", unit_id(UNIT(s)), strerror(-r));
if (s->state == SOCKET_START_POST)
socket_enter_stop_pre(s, false);
else if (s->state == SOCKET_STOP_POST)
socket_enter_dead(s, false);
else
socket_enter_stop_pre(s, false);
socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
}
static int socket_start(Unit *u) {
@ -649,8 +653,8 @@ static int socket_start(Unit *u) {
s->state == SOCKET_STOP_PRE_SIGKILL ||
s->state == SOCKET_STOP_PRE_SIGTERM ||
s->state == SOCKET_STOP_POST ||
s->state == SOCKET_STOP_POST_SIGTERM ||
s->state == SOCKET_STOP_POST_SIGKILL)
s->state == SOCKET_FINAL_SIGTERM ||
s->state == SOCKET_FINAL_SIGKILL)
return -EAGAIN;
if (s->state == SOCKET_START_PRE ||
@ -691,8 +695,8 @@ static int socket_stop(Unit *u) {
s->state == SOCKET_STOP_PRE_SIGTERM ||
s->state == SOCKET_STOP_PRE_SIGKILL ||
s->state == SOCKET_STOP_POST ||
s->state == SOCKET_STOP_POST_SIGTERM ||
s->state == SOCKET_STOP_POST_SIGTERM)
s->state == SOCKET_FINAL_SIGTERM ||
s->state == SOCKET_FINAL_SIGTERM)
return 0;
assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
@ -738,9 +742,8 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
if (s->control_command->command_next &&
(success || (s->state == SOCKET_STOP_PRE || s->state == SOCKET_STOP_POST))) {
log_debug("%s running next command for the state %s", unit_id(u), state_string_table[s->state]);
if (s->control_command->command_next && success) {
log_debug("%s running next command for state %s", unit_id(u), state_string_table[s->state]);
socket_run_next(s, success);
} else {
/* No further commands for this step, so let's figure
@ -754,7 +757,7 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
if (success)
socket_enter_start_post(s);
else
socket_enter_stop_pre(s, false);
socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
break;
case SOCKET_START_POST:
@ -771,8 +774,8 @@ static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
break;
case SOCKET_STOP_POST:
case SOCKET_STOP_POST_SIGTERM:
case SOCKET_STOP_POST_SIGKILL:
case SOCKET_FINAL_SIGTERM:
case SOCKET_FINAL_SIGKILL:
socket_enter_dead(s, success);
break;
@ -792,6 +795,9 @@ static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
switch (s->state) {
case SOCKET_START_PRE:
log_warning("%s starting timed out. Terminating.", unit_id(u));
socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
case SOCKET_START_POST:
log_warning("%s starting timed out. Stopping.", unit_id(u));
socket_enter_stop_pre(s, false);
@ -814,15 +820,15 @@ static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
case SOCKET_STOP_POST:
log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
socket_enter_signal(s, SOCKET_STOP_POST_SIGTERM, false);
socket_enter_signal(s, SOCKET_FINAL_SIGTERM, false);
break;
case SOCKET_STOP_POST_SIGTERM:
case SOCKET_FINAL_SIGTERM:
log_warning("%s stopping timed out (2). Killing.", unit_id(u));
socket_enter_signal(s, SOCKET_STOP_POST_SIGKILL, false);
socket_enter_signal(s, SOCKET_FINAL_SIGKILL, false);
break;
case SOCKET_STOP_POST_SIGKILL:
case SOCKET_FINAL_SIGKILL:
log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
socket_enter_dead(s, false);
break;

4
socket.h
View File

@ -38,8 +38,8 @@ typedef enum SocketState {
SOCKET_STOP_PRE_SIGTERM,
SOCKET_STOP_PRE_SIGKILL,
SOCKET_STOP_POST,
SOCKET_STOP_POST_SIGTERM,
SOCKET_STOP_POST_SIGKILL,
SOCKET_FINAL_SIGTERM,
SOCKET_FINAL_SIGKILL,
SOCKET_MAINTAINANCE,
_SOCKET_STATE_MAX,
_SOCKET_STATE_INVALID = -1

2
test-engine.c
View File

@ -33,7 +33,7 @@ int main(int argc, char *argv[]) {
assert_se(set_unit_path("test2") >= 0);
assert_se(manager_new(MANAGER_INIT, &m) >= 0);
assert_se(manager_new(MANAGER_INIT, false, &m) >= 0);
printf("Load1:\n");
assert_se(manager_load_unit(m, "a.service", &a) == 0);

7
unit.c
View File

@ -471,7 +471,7 @@ int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
assert(u);
assert(c);
if (c->output != EXEC_OUTPUT_KERNEL && c->output != EXEC_OUTPUT_SYSLOG)
if (c->std_output != EXEC_OUTPUT_KERNEL && c->std_output != EXEC_OUTPUT_SYSLOG)
return 0;
/* If syslog or kernel logging is requested, make sure our own
@ -1520,9 +1520,10 @@ static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);
static const char* const kill_mode_table[_KILL_MODE_MAX] = {
[KILL_PROCESS] = "process",
[KILL_CONTROL_GROUP] = "control-group",
[KILL_PROCESS_GROUP] = "process-group",
[KILL_CONTROL_GROUP] = "control-group"
[KILL_PROCESS] = "process",
[KILL_NONE] = "none"
};
DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode);

1
unit.h
View File

@ -47,6 +47,7 @@ typedef enum KillMode {
KILL_CONTROL_GROUP = 0,
KILL_PROCESS_GROUP,
KILL_PROCESS,
KILL_NONE,
_KILL_MODE_MAX,
_KILL_MODE_INVALID = -1
} KillMode;

315
util.c
View File

@ -37,6 +37,10 @@
#include <sys/ioctl.h>
#include <linux/vt.h>
#include <linux/tiocl.h>
#include <termios.h>
#include <stdarg.h>
#include <sys/inotify.h>
#include <sys/poll.h>
#include "macro.h"
#include "util.h"
@ -164,11 +168,14 @@ int close_nointr(int fd) {
}
void close_nointr_nofail(int fd) {
int saved_errno = errno;
/* like close_nointr() but cannot fail, and guarantees errno
* is unchanged */
assert_se(close_nointr(fd) == 0);
errno = saved_errno;
}
int parse_boolean(const char *v) {
@ -1322,6 +1329,314 @@ int chvt(int vt) {
return r;
}
int read_one_char(FILE *f, char *ret, bool *need_nl) {
struct termios old_termios, new_termios;
char c;
char line[1024];
assert(f);
assert(ret);
if (tcgetattr(fileno(f), &old_termios) >= 0) {
new_termios = old_termios;
new_termios.c_lflag &= ~ICANON;
new_termios.c_cc[VMIN] = 1;
new_termios.c_cc[VTIME] = 0;
if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
size_t k;
k = fread(&c, 1, 1, f);
tcsetattr(fileno(f), TCSADRAIN, &old_termios);
if (k <= 0)
return -EIO;
if (need_nl)
*need_nl = c != '\n';
*ret = c;
return 0;
}
}
if (!(fgets(line, sizeof(line), f)))
return -EIO;
truncate_nl(line);
if (strlen(line) != 1)
return -EBADMSG;
if (need_nl)
*need_nl = false;
*ret = line[0];
return 0;
}
int ask(char *ret, const char *replies, const char *text, ...) {
assert(ret);
assert(replies);
assert(text);
for (;;) {
va_list ap;
char c;
int r;
bool need_nl = true;
va_start(ap, text);
vprintf(text, ap);
va_end(ap);
fflush(stdout);
if ((r = read_one_char(stdin, &c, &need_nl)) < 0) {
if (r == -EBADMSG) {
puts("Bad input, please try again.");
continue;
}
putchar('\n');
return r;
}
if (need_nl)
putchar('\n');
if (strchr(replies, c)) {
*ret = c;
return 0;
}
puts("Read unexpected character, please try again.");
}
}
int reset_terminal(int fd) {
struct termios termios;
int r = 0;
assert(fd >= 0);
/* Set terminal up for job control */
if (tcgetattr(fd, &termios) < 0) {
r = -errno;
goto finish;
}
termios.c_iflag &= ~(IGNBRK | BRKINT);
termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
termios.c_oflag |= ONLCR;
termios.c_cflag |= CREAD;
termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
termios.c_cc[VINTR] = 03; /* ^C */
termios.c_cc[VQUIT] = 034; /* ^\ */
termios.c_cc[VERASE] = 0177;
termios.c_cc[VKILL] = 025; /* ^X */
termios.c_cc[VEOF] = 04; /* ^D */
termios.c_cc[VSTART] = 021; /* ^Q */
termios.c_cc[VSTOP] = 023; /* ^S */
termios.c_cc[VSUSP] = 032; /* ^Z */
termios.c_cc[VLNEXT] = 026; /* ^V */
termios.c_cc[VWERASE] = 027; /* ^W */
termios.c_cc[VREPRINT] = 022; /* ^R */
termios.c_cc[VTIME] = 0;
termios.c_cc[VMIN] = 1;
if (tcsetattr(fd, TCSANOW, &termios) < 0)
r = -errno;
finish:
/* Just in case, flush all crap out */
tcflush(fd, TCIOFLUSH);
return r;
}
int open_terminal(const char *name, int mode) {
int fd, r;
if ((fd = open(name, mode)) < 0)
return -errno;
if ((r = isatty(fd)) < 0) {
close_nointr_nofail(fd);
return -errno;
}
if (!r) {
close_nointr_nofail(fd);
return -ENOTTY;
}
return fd;
}
int flush_fd(int fd) {
struct pollfd pollfd;
zero(pollfd);
pollfd.fd = fd;
pollfd.events = POLLIN;
for (;;) {
char buf[1024];
ssize_t l;
int r;
if ((r = poll(&pollfd, 1, 0)) < 0) {
if (errno == EINTR)
continue;
return -errno;
}
if (r == 0)
return 0;
if ((l = read(fd, buf, sizeof(buf))) < 0) {
if (errno == EINTR)
continue;
if (errno == EAGAIN)
return 0;
return -errno;
}
if (l <= 0)
return 0;
}
}
int acquire_terminal(const char *name, bool fail, bool force) {
int fd = -1, notify = -1, r, wd;
assert(name);
/* We use inotify to be notified when the tty is closed. We
* create the watch before checking if we can actually acquire
* it, so that we don't lose any event.
*
* Note: strictly speaking this actually watches for the
* device being closed, it does *not* really watch whether a
* tty loses its controlling process. However, unless some
* rogue process uses TIOCNOTTY on /dev/tty *after* closing
* its tty otherwise this will not become a problem. As long
* as the administrator makes sure not configure any service
* on the same tty as an untrusted user this should not be a
* problem. (Which he probably should not do anyway.) */
if (!fail && !force) {
if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
r = -errno;
goto fail;
}
if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) {
r = -errno;
goto fail;
}
}
for (;;) {
if ((r = flush_fd(notify)) < 0)
goto fail;
/* We pass here O_NOCTTY only so that we can check the return
* value TIOCSCTTY and have a reliable way to figure out if we
* successfully became the controlling process of the tty */
if ((fd = open_terminal(name, O_RDWR|O_NOCTTY)) < 0)
return -errno;
/* First, try to get the tty */
if ((r = ioctl(fd, TIOCSCTTY, force)) < 0 &&
(force || fail || errno != EPERM)) {
r = -errno;
goto fail;
}
if (r >= 0)
break;
assert(!fail);
assert(!force);
assert(notify >= 0);
for (;;) {
struct inotify_event e;
ssize_t l;
if ((l = read(notify, &e, sizeof(e))) != sizeof(e)) {
if (l < 0) {
if (errno == EINTR)
continue;
r = -errno;
} else
r = -EIO;
goto fail;
}
if (e.wd != wd || !(e.mask & IN_CLOSE)) {
r = -errno;
goto fail;
}
break;
}
/* We close the tty fd here since if the old session
* ended our handle will be dead. It's important that
* we do this after sleeping, so that we don't enter
* an endless loop. */
close_nointr_nofail(fd);
}
if (notify >= 0)
close_nointr(notify);
if ((r = reset_terminal(fd)) < 0)
log_warning("Failed to reset terminal: %s", strerror(-r));
return fd;
fail:
if (fd >= 0)
close_nointr(fd);
if (notify >= 0)
close_nointr(notify);
return r;
}
int release_terminal(void) {
int r = 0, fd;
if ((fd = open("/dev/tty", O_RDWR)) < 0)
return -errno;
if (ioctl(fd, TIOCNOTTY) < 0)
r = -errno;
close_nointr_nofail(fd);
return r;
}
static const char *const ioprio_class_table[] = {
[IOPRIO_CLASS_NONE] = "none",
[IOPRIO_CLASS_RT] = "realtime",

11
util.h
View File

@ -27,6 +27,7 @@
#include <sys/time.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
typedef uint64_t usec_t;
@ -200,6 +201,16 @@ bool fstype_is_network(const char *fstype);
int chvt(int vt);
int read_one_char(FILE *f, char *ret, bool *need_nl);
int ask(char *ret, const char *replies, const char *text, ...);
int reset_terminal(int fd);
int open_terminal(const char *name, int mode);
int acquire_terminal(const char *name, bool fail, bool force);
int release_terminal(void);
int flush_fd(int fd);
extern char * __progname;
const char *ioprio_class_to_string(int i);