| /* pthread_getname_np -- Get thread name. Linux version |
| Copyright (C) 2010-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public License as |
| published by the Free Software Foundation; either version 2.1 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If |
| not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <pthreadP.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <sys/prctl.h> |
| |
| #include <not-cancel.h> |
| |
| |
| int |
| pthread_getname_np (pthread_t th, char *buf, size_t len) |
| { |
| const struct pthread *pd = (const struct pthread *) th; |
| |
| /* Unfortunately the kernel headers do not export the TASK_COMM_LEN |
| macro. So we have to define it here. */ |
| #define TASK_COMM_LEN 16 |
| if (len < TASK_COMM_LEN) |
| return ERANGE; |
| |
| if (pd == THREAD_SELF) |
| return prctl (PR_GET_NAME, buf) ? errno : 0; |
| |
| #define FMT "/proc/self/task/%u/comm" |
| char fname[sizeof (FMT) + 8]; |
| sprintf (fname, FMT, (unsigned int) pd->tid); |
| |
| int fd = __open_nocancel (fname, O_RDONLY); |
| if (fd == -1) |
| return errno; |
| |
| int res = 0; |
| ssize_t n = TEMP_FAILURE_RETRY (__read_nocancel (fd, buf, len)); |
| if (n < 0) |
| res = errno; |
| else |
| { |
| if (buf[n - 1] == '\n') |
| buf[n - 1] = '\0'; |
| else if (n == len) |
| res = ERANGE; |
| else |
| buf[n] = '\0'; |
| } |
| |
| __close_nocancel_nostatus (fd); |
| |
| return res; |
| } |