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 | */ |
132a5a4a RK |
18 | /** @file lib/logfd.c |
19 | * @brief Redirect subprocess stderr to DisOrder server's log | |
20 | */ | |
460b9539 | 21 | |
05b75f8d | 22 | #include "common.h" |
460b9539 | 23 | |
24 | #include <unistd.h> | |
460b9539 | 25 | #include <errno.h> |
26 | ||
27 | #include "syscalls.h" | |
28 | #include "logfd.h" | |
29 | #include "event.h" | |
30 | #include "log.h" | |
31 | ||
00682707 | 32 | /** @brief Called when a log FD is readable */ |
460b9539 | 33 | static int logfd_readable(ev_source attribute((unused)) *ev, |
34 | ev_reader *reader, | |
460b9539 | 35 | void *ptr, |
36 | size_t bytes, | |
37 | int eof, | |
38 | void *u) { | |
39 | char *nl; | |
40 | const char *tag = u; | |
41 | int len; | |
42 | ||
43 | while((nl = memchr(ptr, '\n', bytes))) { | |
44 | len = nl - (char *)ptr; | |
45 | ev_reader_consume(reader, len + 1); | |
2e9ba080 | 46 | disorder_info("%s: %.*s", tag, len, (char *)ptr); |
460b9539 | 47 | ptr = nl + 1; |
48 | bytes -= len + 1; | |
49 | } | |
50 | if(eof && bytes) { | |
2e9ba080 | 51 | disorder_info("%s: %.*s", tag, (int)bytes, (char *)ptr); |
460b9539 | 52 | ev_reader_consume(reader, bytes); |
53 | } | |
460b9539 | 54 | return 0; |
55 | } | |
56 | ||
00682707 | 57 | /** @brief Called when a log FD errors */ |
460b9539 | 58 | static int logfd_error(ev_source attribute((unused)) *ev, |
460b9539 | 59 | int errno_value, |
60 | void *u) { | |
61 | const char *tag = u; | |
62 | ||
2e9ba080 | 63 | disorder_error(errno_value, "error reading log pipe from %s", tag); |
460b9539 | 64 | return 0; |
65 | } | |
66 | ||
75d64210 RK |
67 | /** @brief Create file descriptor for a subprocess to log to |
68 | * @param ev Event loop | |
69 | * @param tag Tag for this log | |
70 | * @return File descriptor | |
71 | * | |
72 | * Returns a file descriptor which a subprocess can log to. The normal thing | |
73 | * to do would be to dup2() this fd onto the subprocess's stderr (and to close | |
74 | * it in the parent). | |
75 | * | |
76 | * Any lines written to this fd (i.e. by the subprocess) will be logged via | |
2e9ba080 | 77 | * disorder_info(), with @p tag included. |
75d64210 | 78 | */ |
460b9539 | 79 | int logfd(ev_source *ev, const char *tag) { |
80 | int p[2]; | |
81 | ||
82 | xpipe(p); | |
83 | cloexec(p[0]); | |
84 | nonblock(p[0]); | |
e8c92ba7 RK |
85 | if(!ev_reader_new(ev, p[0], logfd_readable, logfd_error, (void *)tag, |
86 | "logfd")) | |
2e9ba080 | 87 | disorder_fatal(errno, "error calling ev_reader_new"); |
460b9539 | 88 | return p[1]; |
89 | } | |
90 | ||
91 | /* | |
92 | Local Variables: | |
93 | c-basic-offset:2 | |
94 | comment-column:40 | |
95 | fill-column:79 | |
96 | indent-tabs-mode:nil | |
97 | End: | |
98 | */ |