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author | Dees Troy <dees_troy@teamw.in> | 2013-02-27 19:39:14 +0100 |
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committer | Gerrit Code Review <gerrit@5.9.244.119> | 2013-02-27 19:39:14 +0100 |
commit | 2cf31af56114cf997b10218db7c35ee047f5d400 (patch) | |
tree | 85f3b51e45ff8233922f2c0c151299868ca89371 /libblkid/procutils.c | |
parent | libtar - Fix extraction of hardlinks to use the prefix (diff) | |
parent | use libblkid to get filesystem type (diff) | |
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Diffstat (limited to 'libblkid/procutils.c')
-rw-r--r-- | libblkid/procutils.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/libblkid/procutils.c b/libblkid/procutils.c new file mode 100644 index 000000000..52e9ee383 --- /dev/null +++ b/libblkid/procutils.c @@ -0,0 +1,124 @@ +/* + * Copyright (C) 2011 Davidlohr Bueso <dave@gnu.org> + * + * procutils.c: General purpose procfs parsing utilities + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Library Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library Public License for more details. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <sys/types.h> +#include <dirent.h> +#include <ctype.h> + +#include "procutils.h" +#include "c.h" + +/* + * @pid: process ID for which we want to obtain the threads group + * + * Returns: newly allocated tasks structure + */ +struct proc_tasks *proc_open_tasks(pid_t pid) +{ + struct proc_tasks *tasks; + char path[PATH_MAX]; + + sprintf(path, "/proc/%d/task/", pid); + + tasks = malloc(sizeof(struct proc_tasks)); + if (tasks) { + tasks->dir = opendir(path); + if (tasks->dir) + return tasks; + } + + free(tasks); + return NULL; +} + +/* + * @tasks: allocated tasks structure + * + * Returns: nothing + */ +void proc_close_tasks(struct proc_tasks *tasks) +{ + if (tasks && tasks->dir) + closedir(tasks->dir); + free(tasks); +} + +/* + * @tasks: allocated task structure + * @tid: [output] one of the thread IDs belonging to the thread group + * If when an error occurs, it is set to 0. + * + * Returns: 0 on success, 1 on end, -1 on failure or no more threads + */ +int proc_next_tid(struct proc_tasks *tasks, pid_t *tid) +{ + struct dirent *d; + char *end; + + if (!tasks || !tid) + return -1; + + *tid = 0; + errno = 0; + + do { + d = readdir(tasks->dir); + if (!d) + return errno ? -1 : 1; /* error or end-of-dir */ + + if (!isdigit((unsigned char) *d->d_name)) + continue; + + *tid = (pid_t) strtol(d->d_name, &end, 10); + if (errno || d->d_name == end || (end && *end)) + return -1; + + } while (!*tid); + + return 0; +} + +#ifdef TEST_PROGRAM + +int main(int argc, char *argv[]) +{ + pid_t tid, pid; + struct proc_tasks *ts; + + if (argc != 2) { + fprintf(stderr, "usage: %s <pid>\n", argv[0]); + return EXIT_FAILURE; + } + + pid = strtol(argv[1], (char **) NULL, 10); + printf("PID=%d, TIDs:", pid); + + ts = proc_open_tasks(pid); + if (!ts) + err(EXIT_FAILURE, "open list of tasks failed"); + + while (proc_next_tid(ts, &tid) == 0) + printf(" %d", tid); + + printf("\n"); + proc_close_tasks(ts); + return EXIT_SUCCESS; +} +#endif /* TEST_PROGRAM */ |