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86a4c67f | 1 | /* pthread_setname_np -- Set thread name. Linux version |
bfff8b1b | 2 | Copyright (C) 2010-2017 Free Software Foundation, Inc. |
86a4c67f UD |
3 | This file is part of the GNU C Library. |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
16 | License along with the GNU C Library; see the file COPYING.LIB. If |
17 | not, see <http://www.gnu.org/licenses/>. */ | |
86a4c67f UD |
18 | |
19 | #include <errno.h> | |
20 | #include <fcntl.h> | |
21 | #include <pthreadP.h> | |
22 | #include <stdio.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/prctl.h> | |
26 | ||
27 | #include <not-cancel.h> | |
28 | ||
29 | ||
30 | int | |
bd2260a2 | 31 | pthread_setname_np (pthread_t th, const char *name) |
86a4c67f UD |
32 | { |
33 | const struct pthread *pd = (const struct pthread *) th; | |
34 | ||
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 | size_t name_len = strlen (name); | |
39 | if (name_len >= TASK_COMM_LEN) | |
40 | return ERANGE; | |
41 | ||
42 | if (pd == THREAD_SELF) | |
43 | return prctl (PR_SET_NAME, name) ? errno : 0; | |
44 | ||
45 | #define FMT "/proc/self/task/%u/comm" | |
46 | char fname[sizeof (FMT) + 8]; | |
47 | sprintf (fname, FMT, (unsigned int) pd->tid); | |
48 | ||
49 | int fd = open_not_cancel_2 (fname, O_RDWR); | |
50 | if (fd == -1) | |
51 | return errno; | |
52 | ||
53 | int res = 0; | |
54 | ssize_t n = TEMP_FAILURE_RETRY (write_not_cancel (fd, name, name_len)); | |
55 | if (n < 0) | |
56 | res = errno; | |
57 | else if (n != name_len) | |
58 | res = EIO; | |
59 | ||
60 | close_not_cancel_no_status (fd); | |
61 | ||
62 | return res; | |
63 | } |