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- /* pthread_getname_np -- Get thread name. Linux version
- Copyright (C) 2010-2016 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_not_cancel_2 (fname, O_RDONLY);
- if (fd == -1)
- return errno;
- int res = 0;
- ssize_t n = TEMP_FAILURE_RETRY (read_not_cancel (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_not_cancel_no_status (fd);
- return res;
- }
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