diff options
Diffstat (limited to 'src/api.c')
| -rw-r--r-- | src/api.c | 55 |
1 files changed, 55 insertions, 0 deletions
@@ -2473,3 +2473,58 @@ int cgroup_get_task_begin(char *cgroup, char *controller, void **handle, return ret; } + +/** + * Get process data (euid and egid) from /proc/<pid>/status file. + * @param pid: The process id + * @param euid: The uid of param pid + * @param egid: The gid of param pid + * @return 0 on success, > 0 on error. + */ +int cgroup_get_uid_gid_from_procfs(pid_t pid, uid_t *euid, gid_t *egid) +{ + FILE *f; + char path[FILENAME_MAX]; + char buf[4092]; + uid_t ruid, suid, fsuid; + gid_t rgid, sgid, fsgid; + bool found_euid = false; + bool found_egid = false; + + sprintf(path, "/proc/%d/status", pid); + f = fopen(path, "r"); + if (!f) + return ECGROUPNOTEXIST; + + while (fgets(buf, sizeof(buf), f)) { + if (!strncmp(buf, "Uid:", 4)) { + if (sscanf((buf + 5), "%d%d%d%d", &ruid, euid, + &suid, &fsuid) != 4) + break; + cgroup_dbg("Scanned proc values are %d %d %d %d\n", + ruid, *euid, suid, fsuid); + found_euid = true; + } else if (!strncmp(buf, "Gid:", 4)) { + if (sscanf((buf + 5), "%d%d%d%d", &rgid, egid, + &sgid, &fsgid) != 4) + break; + cgroup_dbg("Scanned proc values are %d %d %d %d\n", + rgid, *egid, sgid, fsgid); + found_egid = true; + } + if (found_euid && found_egid) + break; + } + fclose(f); + if (!found_euid || !found_egid) { + /* + * This method doesn't match the file format of + * /proc/<pid>/status. The format has been changed + * and we should catch up the change. + */ + cgroup_dbg("The invlid file format of /proc/%d/status.\n", pid); + return ECGFAIL; + } + return 0; +} + |