1 /* pthread_getname_np -- Get thread name. Linux version
2 Copyright (C) 2010-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, see <https://www.gnu.org/licenses/>. */
25 #include <sys/prctl.h>
27 #include <not-cancel.h>
31 pthread_getname_np (pthread_t th
, char *buf
, size_t len
)
33 const struct pthread
*pd
= (const struct pthread
*) th
;
35 /* Unfortunately the kernel headers do not export the TASK_COMM_LEN
36 macro. So we have to define it here. */
37 #define TASK_COMM_LEN 16
38 if (len
< TASK_COMM_LEN
)
41 if (pd
== THREAD_SELF
)
42 return prctl (PR_GET_NAME
, buf
) ? errno
: 0;
44 #define FMT "/proc/self/task/%u/comm"
45 char fname
[sizeof (FMT
) + 8];
46 sprintf (fname
, FMT
, (unsigned int) pd
->tid
);
48 int fd
= __open64_nocancel (fname
, O_RDONLY
);
53 ssize_t n
= TEMP_FAILURE_RETRY (__read_nocancel (fd
, buf
, len
));
58 if (buf
[n
- 1] == '\n')
66 __close_nocancel_nostatus (fd
);