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1 | /* ioset select() backend for srvx | |
2 | * Copyright 2002-2006 srvx Development Team | |
3 | * | |
4 | * This file is part of srvx. | |
5 | * | |
6 | * srvx is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with srvx; if not, write to the Free Software Foundation, | |
18 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
19 | */ | |
20 | ||
21 | #include "ioset-impl.h" | |
22 | #include "common.h" | |
23 | #include "log.h" | |
24 | ||
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | ||
28 | #ifdef HAVE_SYS_SELECT_H | |
29 | # include <sys/select.h> | |
30 | #endif | |
31 | ||
32 | #ifdef HAVE_SYS_SOCKET_H | |
33 | # include <sys/socket.h> | |
34 | #endif | |
35 | ||
36 | extern int clock_skew; | |
37 | static struct io_fd **fds; | |
38 | static unsigned int fds_size; | |
39 | static fd_set read_fds; | |
40 | static fd_set write_fds; | |
41 | static fd_set except_fds; | |
42 | ||
43 | static int | |
44 | ioset_select_init(void) | |
45 | { | |
46 | return 1; | |
47 | } | |
48 | ||
49 | static void | |
50 | ioset_select_add(struct io_fd *fd) | |
51 | { | |
52 | if ((unsigned)fd->fd >= fds_size) { | |
53 | unsigned int old_size = fds_size; | |
54 | fds_size = fd->fd + 8; | |
55 | fds = realloc(fds, fds_size*sizeof(*fds)); | |
56 | memset(fds+old_size, 0, (fds_size-old_size)*sizeof(*fds)); | |
57 | } | |
58 | fds[fd->fd] = fd; | |
59 | } | |
60 | ||
61 | static void | |
62 | ioset_select_remove(struct io_fd *fd, int closed) | |
63 | { | |
64 | FD_CLR(fd->fd, &read_fds); | |
65 | FD_CLR(fd->fd, &write_fds); | |
66 | FD_CLR(fd->fd, &except_fds); | |
67 | fds[fd->fd] = NULL; | |
68 | (void)closed; | |
69 | } | |
70 | ||
71 | static void | |
72 | ioset_select_update(struct io_fd *fd) | |
73 | { | |
74 | (void)fd; | |
75 | } | |
76 | ||
77 | static void | |
78 | ioset_select_cleanup(void) | |
79 | { | |
80 | free(fds); | |
81 | } | |
82 | ||
83 | #if DEBUG_FDSETS | |
84 | static void | |
85 | debug_fdsets(const char *msg, int nfds, fd_set *read_fds, fd_set *write_fds, fd_set *except_fds, struct timeval *select_timeout) { | |
86 | static const char *flag_text[8] = { "---", "r", "w", "rw", "e", "er", "ew", "erw" }; | |
87 | char buf[MAXLEN]; | |
88 | int pos, ii, flags; | |
89 | struct timeval now; | |
90 | ||
91 | for (pos=ii=0; ii<nfds; ++ii) { | |
92 | flags = FD_ISSET(ii, read_fds) ? 1 : 0; | |
93 | flags |= FD_ISSET(ii, write_fds) ? 2 : 0; | |
94 | flags |= FD_ISSET(ii, except_fds) ? 4 : 0; | |
95 | if (flags) | |
96 | pos += sprintf(buf+pos, " %d%s", ii, flag_text[flags]); | |
97 | } | |
98 | gettimeofday(&now, NULL); | |
99 | if (select_timeout) { | |
100 | log_module(MAIN_LOG, LOG_DEBUG, "%s, at %lu.%06lu:%s (timeout %lu.%06lu)", msg, (unsigned long)now.tv_sec, (unsigned long)now.tv_usec, buf, (unsigned long)select_timeout->tv_sec, (unsigned long)select_timeout->tv_usec); | |
101 | } else { | |
102 | log_module(MAIN_LOG, LOG_DEBUG, "%s, at %lu.%06lu:%s (no timeout)", msg, (unsigned long)now.tv_sec, (unsigned long)now.tv_usec, buf); | |
103 | } | |
104 | } | |
105 | #else | |
106 | # define debug_fdsets(MSG, NFDS, READ_FDS, WRITE_FDS, EXCEPT_FDS, SELECT_TIMEOUT) (void)0 | |
107 | #endif | |
108 | ||
109 | static int | |
110 | ioset_select_loop(struct timeval *timeout) | |
111 | { | |
112 | struct io_fd *fd; | |
113 | unsigned int nn; | |
114 | int select_result; | |
115 | int max_fd; | |
116 | ||
117 | /* Set up read_fds and write_fds fdsets. */ | |
118 | FD_ZERO(&read_fds); | |
119 | FD_ZERO(&write_fds); | |
120 | FD_ZERO(&except_fds); | |
121 | max_fd = -1; | |
122 | for (nn=0; nn<fds_size; nn++) { | |
123 | if (!(fd = fds[nn])) | |
124 | continue; | |
125 | max_fd = nn; | |
126 | FD_SET(nn, &read_fds); | |
127 | FD_SET(nn, &except_fds); | |
128 | if (fd_wants_writes(fd)) | |
129 | FD_SET(nn, &write_fds); | |
130 | } | |
131 | ||
132 | /* Check for activity, update time. */ | |
133 | debug_fdsets("Entering select", max_fd+1, &read_fds, &write_fds, &except_fds, timeout); | |
134 | select_result = select(max_fd + 1, &read_fds, &write_fds, NULL, timeout); | |
135 | debug_fdsets("After select", max_fd+1, &read_fds, &write_fds, &except_fds, timeout); | |
136 | now = time(NULL) + clock_skew; | |
137 | if (select_result < 0) { | |
138 | if (errno != EINTR) { | |
139 | log_module(MAIN_LOG, LOG_ERROR, "select() error %d: %s", errno, strerror(errno)); | |
140 | close_socket(); | |
141 | } | |
142 | return 1; | |
143 | } | |
144 | ||
145 | /* Call back anybody that has connect or read activity and wants to know. */ | |
146 | for (nn=0; nn<fds_size; nn++) { | |
147 | ioset_events(fds[nn], FD_ISSET(nn, &read_fds) | FD_ISSET(nn, &except_fds), FD_ISSET(nn, &write_fds)); | |
148 | } | |
149 | return 0; | |
150 | } | |
151 | ||
152 | struct io_engine io_engine_select = { | |
153 | .name = "select", | |
154 | .init = ioset_select_init, | |
155 | .add = ioset_select_add, | |
156 | .remove = ioset_select_remove, | |
157 | .update = ioset_select_update, | |
158 | .loop = ioset_select_loop, | |
159 | .cleanup = ioset_select_cleanup, | |
160 | }; |