1#define _GNU_SOURCE
 2#include <fcntl.h>
 3#include <unistd.h>
 4#include <sys/prctl.h>
 5
 6#include "pthread_impl.h"
 7
 8int pthread_getname_np(pthread_t thread, char *name, size_t len)
 9{
10	int fd, cs, status = 0;
11	char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
12
13	if (len < 16) return ERANGE;
14
15	if (thread == pthread_self())
16		return prctl(PR_GET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
17
18	snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
19	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
20	if ((fd = open(f, O_RDONLY|O_CLOEXEC)) < 0 || (len = read(fd, name, len)) == -1) status = errno;
21	else name[len-1] = 0; /* remove trailing new line only if successful */
22	if (fd >= 0) close(fd);
23	pthread_setcancelstate(cs, 0);
24	return status;
25}