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add pthread_setname_np

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the thread name is displayed by gdb's "info threads".
This commit is contained in:
Felix Janda 2016-09-16 20:54:00 -04:00 committed by Rich Felker
parent 3ca2d2d4ae
commit 8fb28b0b3e
2 changed files with 27 additions and 0 deletions
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1
include/pthread.h
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@ -214,6 +214,7 @@ struct cpu_set_t;
int pthread_getaffinity_np(pthread_t, size_t, struct cpu_set_t *);
int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
int pthread_getattr_np(pthread_t, pthread_attr_t *);
int pthread_setname_np(pthread_t, const char *);
int pthread_tryjoin_np(pthread_t, void **);
int pthread_timedjoin_np(pthread_t, void **, const struct timespec *);
#endif

26
src/thread/pthread_setname_np.c Normal file
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@ -0,0 +1,26 @@
#define _GNU_SOURCE
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/prctl.h>
#include "pthread_impl.h"
int pthread_setname_np(pthread_t thread, const char *name)
{
int fd, cs, status = 0;
char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
size_t len;
if ((len = strnlen(name, 16)) > 15) return ERANGE;
if (thread == pthread_self())
return prctl(PR_SET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
if ((fd = open(f, O_WRONLY)) < 0 || write(fd, name, len) < 0) status = errno;
if (fd >= 0) close(fd);
pthread_setcancelstate(cs, 0);
return status;
}