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util: add functions getting proc cwd and root

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/proc/[pid]/cwd and /proc/[pid]/root are symliks to corresponding
directories

The added functions returns values of that symlinks.
This commit is contained in:
Jakub Filak 2014-11-19 11:01:19 +01:00 committed by Lennart Poettering
parent 1c6eb4e36b
commit ad450c3e04
3 changed files with 49 additions and 5 deletions
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39
src/shared/util.c
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@ -797,19 +797,30 @@ int get_process_capeff(pid_t pid, char **capeff) {
return get_status_field(p, "\nCapEff:", capeff);
}
static int get_process_link_contents(const char *proc_file, char **name) {
int r;
assert(proc_file);
assert(name);
r = readlink_malloc(proc_file, name);
if (r < 0)
return r == -ENOENT ? -ESRCH : r;
return 0;
}
int get_process_exe(pid_t pid, char **name) {
const char *p;
char *d;
int r;
assert(pid >= 0);
assert(name);
p = procfs_file_alloca(pid, "exe");
r = readlink_malloc(p, name);
r = get_process_link_contents(p, name);
if (r < 0)
return r == -ENOENT ? -ESRCH : r;
return r;
d = endswith(*name, " (deleted)");
if (d)
@ -861,6 +872,26 @@ int get_process_gid(pid_t pid, gid_t *gid) {
return get_process_id(pid, "Gid:", gid);
}
int get_process_cwd(pid_t pid, char **cwd) {
const char *p;
assert(pid >= 0);
p = procfs_file_alloca(pid, "cwd");
return get_process_link_contents(p, cwd);
}
int get_process_root(pid_t pid, char **root) {
const char *p;
assert(pid >= 0);
p = procfs_file_alloca(pid, "root");
return get_process_link_contents(p, root);
}
char *strnappend(const char *s, const char *suffix, size_t b) {
size_t a;
char *r;

2
src/shared/util.h
View File

@ -295,6 +295,8 @@ int get_process_exe(pid_t pid, char **name);
int get_process_uid(pid_t pid, uid_t *uid);
int get_process_gid(pid_t pid, gid_t *gid);
int get_process_capeff(pid_t pid, char **capeff);
int get_process_cwd(pid_t pid, char **cwd);
int get_process_root(pid_t pid, char **root);
char hexchar(int x) _const_;
int unhexchar(char c) _const_;

13
src/test/test-util.c
View File

@ -490,13 +490,14 @@ static void test_u64log2(void) {
static void test_get_process_comm(void) {
struct stat st;
_cleanup_free_ char *a = NULL, *c = NULL, *d = NULL, *f = NULL, *i = NULL;
_cleanup_free_ char *a = NULL, *c = NULL, *d = NULL, *f = NULL, *i = NULL, *cwd = NULL, *root = NULL;
unsigned long long b;
pid_t e;
uid_t u;
gid_t g;
dev_t h;
int r;
pid_t me;
if (stat("/proc/1/comm", &st) == 0) {
assert_se(get_process_comm(1, &a) >= 0);
@ -532,6 +533,16 @@ static void test_get_process_comm(void) {
log_info("pid1 gid: "GID_FMT, g);
assert_se(g == 0);
me = getpid();
r = get_process_cwd(me, &cwd);
assert_se(r >= 0 || r == -EACCES);
log_info("pid1 cwd: '%s'", cwd);
r = get_process_root(me, &root);
assert_se(r >= 0 || r == -EACCES);
log_info("pid1 root: '%s'", root);
assert_se(get_ctty_devnr(1, &h) == -ENOENT);
getenv_for_pid(1, "PATH", &i);