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/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <pthread.h>
#include <fcntl.h>
#include <stdio.h> // For snprintf.
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "private/ErrnoRestorer.h"
#include "pthread_internal.h"
// This value is not exported by kernel headers.
#define MAX_TASK_COMM_LEN 16
#define TASK_COMM_FMT "/proc/self/task/%d/comm"
int pthread_setname_np(pthread_t t, const char* thread_name) {
ErrnoRestorer errno_restorer;
size_t thread_name_len = strlen(thread_name);
if (thread_name_len >= MAX_TASK_COMM_LEN) {
return ERANGE;
}
// Changing our own name is an easy special case.
if (t == pthread_self()) {
return prctl(PR_SET_NAME, thread_name) ? errno : 0;
}
// We have to change another thread's name.
pthread_internal_t* thread = __pthread_internal_find(t);
if (thread == NULL) {
return ENOENT;
}
pid_t tid = thread->tid;
char comm_name[sizeof(TASK_COMM_FMT) + 8];
snprintf(comm_name, sizeof(comm_name), TASK_COMM_FMT, tid);
int fd = open(comm_name, O_CLOEXEC | O_WRONLY);
if (fd == -1) {
return errno;
}
ssize_t n = TEMP_FAILURE_RETRY(write(fd, thread_name, thread_name_len));
close(fd);
if (n < 0) {
return errno;
} else if (n != static_cast<ssize_t>(thread_name_len)) {
return EIO;
}
return 0;
}
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