| /* |
| * 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/bionic_defs.h" |
| #include "private/ErrnoRestorer.h" |
| #include "pthread_internal.h" |
| |
| // This value is not exported by kernel headers. |
| #define MAX_TASK_COMM_LEN 16 |
| |
| static int __open_task_comm_fd(pthread_t t, int flags, const char* caller) { |
| char comm_name[64]; |
| snprintf(comm_name, sizeof(comm_name), "/proc/self/task/%d/comm", |
| __pthread_internal_gettid(t, caller)); |
| return open(comm_name, O_CLOEXEC | flags); |
| } |
| |
| __BIONIC_WEAK_FOR_NATIVE_BRIDGE |
| int pthread_getname_np(pthread_t t, char* buf, size_t buf_size) { |
| ErrnoRestorer errno_restorer; |
| |
| if (buf_size < MAX_TASK_COMM_LEN) return ERANGE; |
| |
| // Getting our own name is an easy special case. |
| if (t == pthread_self()) { |
| return prctl(PR_GET_NAME, buf) ? errno : 0; |
| } |
| |
| // We have to get another thread's name. |
| int fd = __open_task_comm_fd(t, O_RDONLY, "pthread_getname_np"); |
| if (fd == -1) return errno; |
| |
| ssize_t n = TEMP_FAILURE_RETRY(read(fd, buf, buf_size)); |
| close(fd); |
| |
| if (n == -1) return errno; |
| |
| // The kernel adds a trailing '\n' to the /proc file, |
| // so this is actually the normal case for short names. |
| if (n > 0 && buf[n - 1] == '\n') { |
| buf[n - 1] = '\0'; |
| return 0; |
| } |
| |
| if (n == static_cast<ssize_t>(buf_size)) return ERANGE; |
| buf[n] = '\0'; |
| return 0; |
| } |
| |
| __BIONIC_WEAK_FOR_NATIVE_BRIDGE |
| 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; |
| |
| // Setting our own name is an easy special case. |
| if (t == pthread_self()) { |
| return prctl(PR_SET_NAME, thread_name) ? errno : 0; |
| } |
| |
| // We have to set another thread's name. |
| int fd = __open_task_comm_fd(t, O_WRONLY, "pthread_setname_np"); |
| if (fd == -1) return errno; |
| |
| ssize_t n = TEMP_FAILURE_RETRY(write(fd, thread_name, thread_name_len)); |
| close(fd); |
| |
| if (n == -1) return errno; |
| if (n != static_cast<ssize_t>(thread_name_len)) return EIO; |
| return 0; |
| } |