Commit | Line | Data |
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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
38b8221f | 3 | * Copyright (C) 2005, 2007 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
10 | * This program 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 | |
13 | * GNU General Public License for more details. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
18 | ||
05b75f8d | 19 | #include "common.h" |
460b9539 | 20 | |
21 | #include <unistd.h> | |
460b9539 | 22 | #include <errno.h> |
23 | ||
24 | #include "syscalls.h" | |
25 | #include "logfd.h" | |
26 | #include "event.h" | |
27 | #include "log.h" | |
28 | ||
460b9539 | 29 | /* called when bytes are available and at eof */ |
30 | static int logfd_readable(ev_source attribute((unused)) *ev, | |
31 | ev_reader *reader, | |
460b9539 | 32 | void *ptr, |
33 | size_t bytes, | |
34 | int eof, | |
35 | void *u) { | |
36 | char *nl; | |
37 | const char *tag = u; | |
38 | int len; | |
39 | ||
40 | while((nl = memchr(ptr, '\n', bytes))) { | |
41 | len = nl - (char *)ptr; | |
42 | ev_reader_consume(reader, len + 1); | |
43 | info("%s: %.*s", tag, len, (char *)ptr); | |
44 | ptr = nl + 1; | |
45 | bytes -= len + 1; | |
46 | } | |
47 | if(eof && bytes) { | |
48 | info("%s: %.*s", tag, (int)bytes, (char *)ptr); | |
49 | ev_reader_consume(reader, bytes); | |
50 | } | |
460b9539 | 51 | return 0; |
52 | } | |
53 | ||
54 | /* called when a read error occurs */ | |
55 | static int logfd_error(ev_source attribute((unused)) *ev, | |
460b9539 | 56 | int errno_value, |
57 | void *u) { | |
58 | const char *tag = u; | |
59 | ||
60 | error(errno_value, "error reading log pipe from %s", tag); | |
460b9539 | 61 | return 0; |
62 | } | |
63 | ||
75d64210 RK |
64 | /** @brief Create file descriptor for a subprocess to log to |
65 | * @param ev Event loop | |
66 | * @param tag Tag for this log | |
67 | * @return File descriptor | |
68 | * | |
69 | * Returns a file descriptor which a subprocess can log to. The normal thing | |
70 | * to do would be to dup2() this fd onto the subprocess's stderr (and to close | |
71 | * it in the parent). | |
72 | * | |
73 | * Any lines written to this fd (i.e. by the subprocess) will be logged via | |
74 | * info(), with @p tag included. | |
75 | */ | |
460b9539 | 76 | int logfd(ev_source *ev, const char *tag) { |
77 | int p[2]; | |
78 | ||
79 | xpipe(p); | |
80 | cloexec(p[0]); | |
81 | nonblock(p[0]); | |
e8c92ba7 RK |
82 | if(!ev_reader_new(ev, p[0], logfd_readable, logfd_error, (void *)tag, |
83 | "logfd")) | |
460b9539 | 84 | fatal(errno, "error calling ev_reader_new"); |
85 | return p[1]; | |
86 | } | |
87 | ||
88 | /* | |
89 | Local Variables: | |
90 | c-basic-offset:2 | |
91 | comment-column:40 | |
92 | fill-column:79 | |
93 | indent-tabs-mode:nil | |
94 | End: | |
95 | */ |