chiark / gitweb /
Fiddle with CSS+HTML in effort to get more consistent buttons
[disorder] / lib / logfd.c
CommitLineData
460b9539 1/*
2 * This file is part of DisOrder
38b8221f 3 * Copyright (C) 2005, 2007 Richard Kettlewell
460b9539 4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
05b75f8d 21#include "common.h"
460b9539 22
23#include <unistd.h>
460b9539 24#include <errno.h>
25
26#include "syscalls.h"
27#include "logfd.h"
28#include "event.h"
29#include "log.h"
30
460b9539 31/* called when bytes are available and at eof */
32static int logfd_readable(ev_source attribute((unused)) *ev,
33 ev_reader *reader,
460b9539 34 void *ptr,
35 size_t bytes,
36 int eof,
37 void *u) {
38 char *nl;
39 const char *tag = u;
40 int len;
41
42 while((nl = memchr(ptr, '\n', bytes))) {
43 len = nl - (char *)ptr;
44 ev_reader_consume(reader, len + 1);
45 info("%s: %.*s", tag, len, (char *)ptr);
46 ptr = nl + 1;
47 bytes -= len + 1;
48 }
49 if(eof && bytes) {
50 info("%s: %.*s", tag, (int)bytes, (char *)ptr);
51 ev_reader_consume(reader, bytes);
52 }
460b9539 53 return 0;
54}
55
56/* called when a read error occurs */
57static int logfd_error(ev_source attribute((unused)) *ev,
460b9539 58 int errno_value,
59 void *u) {
60 const char *tag = u;
61
62 error(errno_value, "error reading log pipe from %s", tag);
460b9539 63 return 0;
64}
65
75d64210
RK
66/** @brief Create file descriptor for a subprocess to log to
67 * @param ev Event loop
68 * @param tag Tag for this log
69 * @return File descriptor
70 *
71 * Returns a file descriptor which a subprocess can log to. The normal thing
72 * to do would be to dup2() this fd onto the subprocess's stderr (and to close
73 * it in the parent).
74 *
75 * Any lines written to this fd (i.e. by the subprocess) will be logged via
76 * info(), with @p tag included.
77 */
460b9539 78int logfd(ev_source *ev, const char *tag) {
79 int p[2];
80
81 xpipe(p);
82 cloexec(p[0]);
83 nonblock(p[0]);
e8c92ba7
RK
84 if(!ev_reader_new(ev, p[0], logfd_readable, logfd_error, (void *)tag,
85 "logfd"))
460b9539 86 fatal(errno, "error calling ev_reader_new");
87 return p[1];
88}
89
90/*
91Local Variables:
92c-basic-offset:2
93comment-column:40
94fill-column:79
95indent-tabs-mode:nil
96End:
97*/