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process-util: shortcut get_process_comm() for our own process

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Let's bypass /proc if we can.
This commit is contained in:
Lennart Poettering 2019-11-25 14:58:24 +01:00
parent aad3a64d63
commit cde93ba2a5
1 changed files with 20 additions and 9 deletions
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29
src/basic/process-util.c
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@ -81,24 +81,35 @@ static int get_process_state(pid_t pid) {
int get_process_comm(pid_t pid, char **ret) {
_cleanup_free_ char *escaped = NULL, *comm = NULL;
const char *p;
int r;
assert(ret);
assert(pid >= 0);
if (pid == 0 || pid == getpid_cached()) {
comm = new0(char, TASK_COMM_LEN + 1); /* Must fit in 16 byte according to prctl(2) */
if (!comm)
return -ENOMEM;
if (prctl(PR_GET_NAME, comm) < 0)
return -errno;
} else {
const char *p;
p = procfs_file_alloca(pid, "comm");
/* Note that process names of kernel threads can be much longer than TASK_COMM_LEN */
r = read_one_line_file(p, &comm);
if (r == -ENOENT)
return -ESRCH;
if (r < 0)
return r;
}
escaped = new(char, COMM_MAX_LEN);
if (!escaped)
return -ENOMEM;
p = procfs_file_alloca(pid, "comm");
r = read_one_line_file(p, &comm);
if (r == -ENOENT)
return -ESRCH;
if (r < 0)
return r;
/* Escape unprintable characters, just in case, but don't grow the string beyond the underlying size */
cellescape(escaped, COMM_MAX_LEN, comm);