pthread_getname_np.c raw

   1  #define _GNU_SOURCE
   2  #include <fcntl.h>
   3  #include <unistd.h>
   4  #include <sys/prctl.h>
   5  
   6  #include "pthread_impl.h"
   7  
   8  int 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  }
  26