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86a4c67f | 1 | /* pthread_getname_np -- Get thread name. Linux version |
d4697bc9 | 2 | Copyright (C) 2010-2014 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 | |
31 | pthread_getname_np (th, buf, len) | |
32 | pthread_t th; | |
33 | char *buf; | |
34 | size_t len; | |
35 | { | |
36 | const struct pthread *pd = (const struct pthread *) th; | |
37 | ||
38 | /* Unfortunately the kernel headers do not export the TASK_COMM_LEN | |
39 | macro. So we have to define it here. */ | |
40 | #define TASK_COMM_LEN 16 | |
41 | if (len < TASK_COMM_LEN) | |
42 | return ERANGE; | |
43 | ||
e8ee8bdf | 44 | if (pd == THREAD_SELF) |
5d7a6541 | 45 | return prctl (PR_GET_NAME, buf) ? errno : 0; |
86a4c67f UD |
46 | |
47 | #define FMT "/proc/self/task/%u/comm" | |
48 | char fname[sizeof (FMT) + 8]; | |
49 | sprintf (fname, FMT, (unsigned int) pd->tid); | |
50 | ||
51 | int fd = open_not_cancel_2 (fname, O_RDONLY); | |
52 | if (fd == -1) | |
53 | return errno; | |
54 | ||
55 | int res = 0; | |
56 | ssize_t n = TEMP_FAILURE_RETRY (read_not_cancel (fd, buf, len)); | |
57 | if (n < 0) | |
58 | res = errno; | |
60e8585f UD |
59 | else |
60 | { | |
61 | if (buf[n - 1] == '\n') | |
62 | buf[n - 1] = '\0'; | |
63 | else if (n == len) | |
64 | res = ERANGE; | |
65 | else | |
66 | buf[n] = '\0'; | |
67 | } | |
86a4c67f UD |
68 | |
69 | close_not_cancel_no_status (fd); | |
70 | ||
71 | return res; | |
72 | } |