github.com/afumu/libc@v0.0.6/musl/src/thread/pthread_setname_np.c (about)

     1  #define _GNU_SOURCE
     2  #include <fcntl.h>
     3  #include <string.h>
     4  #include <unistd.h>
     5  #include <sys/prctl.h>
     6  
     7  #include "pthread_impl.h"
     8  
     9  int pthread_setname_np(pthread_t thread, const char *name)
    10  {
    11  	int fd, cs, status = 0;
    12  	char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
    13  	size_t len;
    14  
    15  	if ((len = strnlen(name, 16)) > 15) return ERANGE;
    16  
    17  	if (thread == pthread_self())
    18  		return prctl(PR_SET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
    19  
    20  	snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
    21  	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
    22  	if ((fd = open(f, O_WRONLY)) < 0 || write(fd, name, len) < 0) status = errno;
    23  	if (fd >= 0) close(fd);
    24  	pthread_setcancelstate(cs, 0);
    25  	return status;
    26  }