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