glibc/nptl/pthread_setname.c
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

64 lines
1.8 KiB
C

/* pthread_setname_np -- Set thread name. Linux version
Copyright (C) 2010-2021 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 <https://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_setname_np (pthread_t th, const char *name)
{
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
size_t name_len = strlen (name);
if (name_len >= TASK_COMM_LEN)
return ERANGE;
if (pd == THREAD_SELF)
return prctl (PR_SET_NAME, name) ? errno : 0;
#define FMT "/proc/self/task/%u/comm"
char fname[sizeof (FMT) + 8];
sprintf (fname, FMT, (unsigned int) pd->tid);
int fd = __open64_nocancel (fname, O_RDWR);
if (fd == -1)
return errno;
int res = 0;
ssize_t n = TEMP_FAILURE_RETRY (__write_nocancel (fd, name, name_len));
if (n < 0)
res = errno;
else if (n != name_len)
res = EIO;
__close_nocancel_nostatus (fd);
return res;
}