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| author | Leah Neukirchen <leah@vuxu.org> | 2018-09-17 13:08:14 +0200 |
|---|---|---|
| committer | Leah Neukirchen <leah@vuxu.org> | 2018-09-17 13:08:14 +0200 |
| commit | fffd96ebd5148e1ac6e73250f06a132ab36443b6 (patch) | |
| tree | 55aadcb631cf478578d06721953c31034d60cee8 /extrace.c | |
| parent | 0dcdc241208ab35654a9261d5e1cfa7b49da3212 (diff) | |
| download | extrace-fffd96ebd5148e1ac6e73250f06a132ab36443b6.tar.gz extrace-fffd96ebd5148e1ac6e73250f06a132ab36443b6.tar.xz extrace-fffd96ebd5148e1ac6e73250f06a132ab36443b6.zip | |
extract: verify pid exists
Diffstat (limited to 'extrace.c')
| -rw-r--r-- | extrace.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/extrace.c b/extrace.c index 24c5d84..e28a29c 100644 --- a/extrace.c +++ b/extrace.c @@ -443,6 +443,29 @@ handle_msg(struct cn_msg *cn_hdr) } } +static pid_t +parse_pid(char *s) +{ + pid_t pid; + char *end; + + errno = 0; + pid = strtol(s, &end, 10); + if (pid <= 0 || *end || errno != 0) { + fprintf(stderr, "extrace: %s: invalid process id\n", s); + exit(1); + } + + errno = 0; + kill(pid, 0); + if (errno == ESRCH) { + fprintf(stderr, "extrace: %s: no such process\n", s); + exit(1); + } + + return pid; +} + int main(int argc, char *argv[]) { @@ -465,7 +488,7 @@ main(int argc, char *argv[]) case 'e': show_env = 1; break; case 'f': flat = 1; break; case 'l': full_path = 1; break; - case 'p': parent = atoi(optarg); break; + case 'p': parent = parse_pid(optarg); break; case 'q': show_args = 0; break; case 't': show_exit = 1; break; case 'o': |