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systemd/util.c
Lennart Poettering 44d8db9e5a various cleanups
2010-01-26 07:02:51 +01:00

405 lines
8.5 KiB
C

/*-*- Mode: C; c-basic-offset: 8 -*-*/
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include "macro.h"
#include "util.h"
usec_t now(clockid_t clock) {
struct timespec ts;
assert_se(clock_gettime(clock, &ts) == 0);
return timespec_load(&ts);
}
usec_t timespec_load(const struct timespec *ts) {
assert(ts);
return
(usec_t) ts->tv_sec * USEC_PER_SEC +
(usec_t) ts->tv_nsec / NSEC_PER_USEC;
}
struct timespec *timespec_store(struct timespec *ts, usec_t u) {
assert(ts);
ts->tv_sec = (time_t) (u / USEC_PER_SEC);
ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
return ts;
}
usec_t timeval_load(const struct timeval *tv) {
assert(tv);
return
(usec_t) tv->tv_sec * USEC_PER_SEC +
(usec_t) tv->tv_usec;
}
struct timeval *timeval_store(struct timeval *tv, usec_t u) {
assert(tv);
tv->tv_sec = (time_t) (u / USEC_PER_SEC);
tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
return tv;
}
bool endswith(const char *s, const char *postfix) {
size_t sl, pl;
assert(s);
assert(postfix);
sl = strlen(s);
pl = strlen(postfix);
if (sl < pl)
return false;
return memcmp(s + sl - pl, postfix, pl) == 0;
}
bool startswith(const char *s, const char *prefix) {
size_t sl, pl;
assert(s);
assert(prefix);
sl = strlen(s);
pl = strlen(prefix);
if (sl < pl)
return false;
return memcmp(s, prefix, pl) == 0;
}
int close_nointr(int fd) {
assert(fd >= 0);
for (;;) {
int r;
if ((r = close(fd)) >= 0)
return r;
if (errno != EINTR)
return r;
}
}
int parse_boolean(const char *v) {
assert(v);
if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
return 1;
else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
return 0;
return -EINVAL;
}
int safe_atou(const char *s, unsigned *ret_u) {
char *x = NULL;
unsigned long l;
assert(s);
assert(ret_u);
errno = 0;
l = strtoul(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
if ((unsigned long) (unsigned) l != l)
return -ERANGE;
*ret_u = (unsigned) l;
return 0;
}
int safe_atoi(const char *s, int *ret_i) {
char *x = NULL;
long l;
assert(s);
assert(ret_i);
errno = 0;
l = strtol(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
if ((long) (int) l != l)
return -ERANGE;
*ret_i = (int) l;
return 0;
}
int safe_atolu(const char *s, long unsigned *ret_lu) {
char *x = NULL;
unsigned long l;
assert(s);
assert(ret_lu);
errno = 0;
l = strtoul(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
*ret_lu = l;
return 0;
}
int safe_atoli(const char *s, long int *ret_li) {
char *x = NULL;
long l;
assert(s);
assert(ret_li);
errno = 0;
l = strtol(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
*ret_li = l;
return 0;
}
int safe_atollu(const char *s, long long unsigned *ret_llu) {
char *x = NULL;
unsigned long long l;
assert(s);
assert(ret_llu);
errno = 0;
l = strtoull(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
*ret_llu = l;
return 0;
}
int safe_atolli(const char *s, long long int *ret_lli) {
char *x = NULL;
long long l;
assert(s);
assert(ret_lli);
errno = 0;
l = strtoll(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
*ret_lli = l;
return 0;
}
/* Split a string into words. */
char *split_spaces(const char *c, size_t *l, char **state) {
char *current;
current = *state ? *state : (char*) c;
if (!*current || *c == 0)
return NULL;
current += strspn(current, WHITESPACE);
*l = strcspn(current, WHITESPACE);
*state = current+*l;
return (char*) current;
}
/* Split a string into words, but consider strings enclosed in '' and
* "" as words even if they include spaces. */
char *split_quoted(const char *c, size_t *l, char **state) {
char *current;
current = *state ? *state : (char*) c;
if (!*current || *c == 0)
return NULL;
current += strspn(current, WHITESPACE);
if (*current == '\'') {
current ++;
*l = strcspn(current, "'");
*state = current+*l;
if (**state == '\'')
(*state)++;
} else if (*current == '\"') {
current ++;
*l = strcspn(current+1, "\"");
*state = current+*l;
if (**state == '\"')
(*state)++;
} else {
*l = strcspn(current, WHITESPACE);
*state = current+*l;
}
/* FIXME: Cannot deal with strings that have spaces AND ticks
* in them */
return (char*) current;
}
const char *sigchld_code(int code) {
if (code == CLD_EXITED)
return "exited";
else if (code == CLD_KILLED)
return "killed";
else if (code == CLD_DUMPED)
return "dumped";
else if (code == CLD_TRAPPED)
return "trapped";
else if (code == CLD_STOPPED)
return "stopped";
else if (code == CLD_CONTINUED)
return "continued";
return "unknown";
}
int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
int r;
FILE *f;
char fn[132], line[256], *p;
long long unsigned ppid;
assert(pid >= 0);
assert(_ppid);
assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%llu/stat", (unsigned long long) pid) < (int) (sizeof(fn)-1));
fn[sizeof(fn)-1] = 0;
if (!(f = fopen(fn, "r")))
return -errno;
if (!(fgets(line, sizeof(line), f))) {
r = -errno;
fclose(f);
return r;
}
fclose(f);
/* Let's skip the pid and comm fields. The latter is enclosed
* in () but does not escape any () in its value, so let's
* skip over it manually */
if (!(p = strrchr(line, ')')))
return -EIO;
p++;
if (sscanf(p, " "
"%*c " /* state */
"%llu ", /* ppid */
&ppid) != 1)
return -EIO;
if ((long long unsigned) (pid_t) ppid != ppid)
return -ERANGE;
*_ppid = (pid_t) ppid;
return 0;
}
int write_one_line_file(const char *fn, const char *line) {
FILE *f;
int r;
assert(fn);
assert(line);
if (!(f = fopen(fn, "we")))
return -errno;
if (fputs(line, f) < 0) {
r = -errno;
goto finish;
}
r = 0;
finish:
fclose(f);
return r;
}
int read_one_line_file(const char *fn, char **line) {
FILE *f;
int r;
char t[64], *c;
assert(fn);
assert(line);
if (!(f = fopen(fn, "re")))
return -errno;
if (!(fgets(t, sizeof(t), f))) {
r = -errno;
goto finish;
}
if (!(c = strdup(t))) {
r = -ENOMEM;
goto finish;
}
*line = c;
r = 0;
finish:
fclose(f);
return r;
}
char *strappend(const char *s, const char *suffix) {
size_t a, b;
char *r;
assert(s);
assert(suffix);
a = strlen(s);
b = strlen(suffix);
if (!(r = new(char, a+b+1)))
return NULL;
memcpy(r, s, a);
memcpy(r+a, suffix, b);
r[a+b] = 0;
return r;
}