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add pthread_getname_np function

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based on the pthread_setname_np implementation
This commit is contained in:
Érico Rolim 2021-04-20 16:15:15 -03:00 committed by Rich Felker
parent e1a51185ce
commit bd3b9c4ca5
2 changed files with 26 additions and 0 deletions
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1
include/pthread.h
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@ -221,6 +221,7 @@ 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_getname_np(pthread_t, char *, size_t);
int pthread_getattr_default_np(pthread_attr_t *);
int pthread_setattr_default_np(const pthread_attr_t *);
int pthread_tryjoin_np(pthread_t, void **);

25
src/thread/pthread_getname_np.c Normal file
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@ -0,0 +1,25 @@
#define _GNU_SOURCE
#include <fcntl.h>
#include <unistd.h>
#include <sys/prctl.h>
#include "pthread_impl.h"
int pthread_getname_np(pthread_t thread, char *name, size_t len)
{
int fd, cs, status = 0;
char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
if (len < 16) return ERANGE;
if (thread == pthread_self())
return prctl(PR_GET_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_RDONLY|O_CLOEXEC)) < 0 || (len = read(fd, name, len)) < 0) status = errno;
else name[len-1] = 0; /* remove trailing new line only if successful */
if (fd >= 0) close(fd);
pthread_setcancelstate(cs, 0);
return status;
}