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