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fe2c818f75
Also return EINVAL if the thread is already terminated at the time of the call. Checked on x86_64-linux-gnu.
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* pthread_getname_np -- Get thread name. Linux version
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Copyright (C) 2010-2025 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 <https://www.gnu.org/licenses/>. */
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#include <intprops.h>
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#include <libc-lock.h>
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#include <not-cancel.h>
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#include <pthreadP.h>
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#include <shlib-compat.h>
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#include <stdio.h>
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#include <sys/prctl.h>
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static int
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getname (pid_t tid, char *buf, size_t len)
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{
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char fname[sizeof ("/proc/self/task//comm") + INT_BUFSIZE_BOUND (pid_t)];
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__snprintf (fname, sizeof (fname), "/proc/self/task/%d/comm", tid);
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int fd = __open64_nocancel (fname, O_RDONLY);
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if (fd == -1)
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return EINVAL;
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int res = 0;
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ssize_t n = TEMP_FAILURE_RETRY (__read_nocancel (fd, buf, len));
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if (n > 0)
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{
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if (buf[n - 1] == '\n')
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buf[n - 1] = '\0';
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else if (n == len)
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res = ERANGE;
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else
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buf[n] = '\0';
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}
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else
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res = errno == ENOENT ? EINVAL : errno;;
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__close_nocancel_nostatus (fd);
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return res;
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}
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int
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__pthread_getname_np (pthread_t th, char *buf, size_t len)
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{
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struct pthread *pd = (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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if (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_GET_NAME, buf) ? errno : 0;
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/* Block all signals, as required by pd->exit_lock. */
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internal_sigset_t old_mask;
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internal_signal_block_all (&old_mask);
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__libc_lock_lock (pd->exit_lock);
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int res = pd->tid > 0 ? getname (pd->tid, buf, len) : EINVAL;
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__libc_lock_unlock (pd->exit_lock);
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internal_signal_restore_set (&old_mask);
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return res;
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}
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versioned_symbol (libc, __pthread_getname_np, pthread_getname_np,
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GLIBC_2_34);
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#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_12, GLIBC_2_34)
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compat_symbol (libpthread, __pthread_getname_np, pthread_getname_np,
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GLIBC_2_12);
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#endif
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