]>
Commit | Line | Data |
---|---|---|
91b6eb11 | 1 | /* Capture output from a subprocess. |
d614a753 | 2 | Copyright (C) 2017-2020 Free Software Foundation, Inc. |
91b6eb11 FW |
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 | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the 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 | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
91b6eb11 | 18 | |
0e169691 | 19 | #include <support/subprocess.h> |
91b6eb11 FW |
20 | #include <support/capture_subprocess.h> |
21 | ||
22 | #include <errno.h> | |
23 | #include <stdlib.h> | |
24 | #include <support/check.h> | |
25 | #include <support/xunistd.h> | |
26 | #include <support/xsocket.h> | |
0e169691 | 27 | #include <support/xspawn.h> |
91b6eb11 FW |
28 | |
29 | static void | |
30 | transfer (const char *what, struct pollfd *pfd, struct xmemstream *stream) | |
31 | { | |
32 | if (pfd->revents != 0) | |
33 | { | |
34 | char buf[1024]; | |
35 | ssize_t ret = TEMP_FAILURE_RETRY (read (pfd->fd, buf, sizeof (buf))); | |
36 | if (ret < 0) | |
37 | { | |
38 | support_record_failure (); | |
39 | printf ("error: reading from subprocess %s: %m", what); | |
40 | pfd->events = 0; | |
41 | pfd->revents = 0; | |
42 | } | |
43 | else if (ret == 0) | |
44 | { | |
45 | /* EOF reached. Stop listening. */ | |
46 | pfd->events = 0; | |
47 | pfd->revents = 0; | |
48 | } | |
49 | else | |
50 | /* Store the data just read. */ | |
51 | TEST_VERIFY (fwrite (buf, ret, 1, stream->out) == 1); | |
52 | } | |
53 | } | |
54 | ||
0e169691 AZ |
55 | static void |
56 | support_capture_poll (struct support_capture_subprocess *result, | |
57 | struct support_subprocess *proc) | |
91b6eb11 | 58 | { |
91b6eb11 FW |
59 | struct pollfd fds[2] = |
60 | { | |
0e169691 AZ |
61 | { .fd = proc->stdout_pipe[0], .events = POLLIN }, |
62 | { .fd = proc->stderr_pipe[0], .events = POLLIN }, | |
91b6eb11 FW |
63 | }; |
64 | ||
65 | do | |
66 | { | |
67 | xpoll (fds, 2, -1); | |
0e169691 AZ |
68 | transfer ("stdout", &fds[0], &result->out); |
69 | transfer ("stderr", &fds[1], &result->err); | |
91b6eb11 FW |
70 | } |
71 | while (fds[0].events != 0 || fds[1].events != 0); | |
91b6eb11 | 72 | |
0e169691 AZ |
73 | xfclose_memstream (&result->out); |
74 | xfclose_memstream (&result->err); | |
75 | ||
76 | result->status = support_process_wait (proc); | |
77 | } | |
78 | ||
79 | struct support_capture_subprocess | |
80 | support_capture_subprocess (void (*callback) (void *), void *closure) | |
81 | { | |
82 | struct support_capture_subprocess result; | |
83 | xopen_memstream (&result.out); | |
84 | xopen_memstream (&result.err); | |
85 | ||
86 | struct support_subprocess proc = support_subprocess (callback, closure); | |
87 | ||
88 | support_capture_poll (&result, &proc); | |
89 | return result; | |
90 | } | |
91 | ||
92 | struct support_capture_subprocess | |
93 | support_capture_subprogram (const char *file, char *const argv[]) | |
94 | { | |
95 | struct support_capture_subprocess result; | |
96 | xopen_memstream (&result.out); | |
97 | xopen_memstream (&result.err); | |
98 | ||
99 | struct support_subprocess proc = support_subprogram (file, argv); | |
100 | ||
101 | support_capture_poll (&result, &proc); | |
91b6eb11 FW |
102 | return result; |
103 | } | |
104 | ||
105 | void | |
106 | support_capture_subprocess_free (struct support_capture_subprocess *p) | |
107 | { | |
108 | free (p->out.buffer); | |
109 | free (p->err.buffer); | |
110 | } |