Simplify vss_preselect().
[paraslash.git] / audioc.c
1 /*
2 * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audioc.c the client program used to connect to para_audiod */
8
9 #include <sys/types.h>
10 #include <dirent.h>
11
12 #include "audioc.cmdline.h"
13 #include "para.h"
14 #include "error.h"
15 #include "net.h"
16 #include "string.h"
17 #include "fd.h"
18
19 INIT_AUDIOC_ERRLISTS;
20
21 /** the gengetopt structure containing command line args */
22 struct audioc_args_info conf;
23
24 INIT_STDERR_LOGGING(conf.loglevel_arg);
25
26 static char *concat_args(unsigned argc, char * const *argv)
27 {
28 int i; char *buf = NULL;
29 for (i = 0; i < argc; i++) {
30 buf = para_strcat(buf, argv[i]);
31 if (i != argc - 1)
32 buf = para_strcat(buf, "\n");
33 }
34 return buf;
35 }
36
37 static char *configfile_exists(void)
38 {
39 static char *config_file;
40 struct stat statbuf;
41
42
43 if (!config_file) {
44 char *home = para_homedir();
45 config_file = make_message("%s/.paraslash/audioc.conf", home);
46 free(home);
47 }
48 if (!stat(config_file, &statbuf))
49 return config_file;
50 return NULL;
51 }
52
53 /**
54 * the client program to connect to para_audiod
55 *
56 * \param argc usual argument count
57 * \param argv usual argument vector
58 *
59 * It creates a temporary local socket in order to communicate with para_audiod.
60 * Authentication consists in sending a ucred buffer that contains the user id.
61 *
62 * Any output received through the local socket is sent to stdout.
63 *
64 * \return EXIT_SUCCESS or EXIT_FAILURE
65 *
66 * \sa send_cred_buffer(), para_audioc(1), para_audiod(1).
67 */
68 int main(int argc, char *argv[])
69 {
70 int ret = -E_AUDIOC_SYNTAX, fd;
71 char *cf, *buf = NULL, *args;
72 size_t bufsize, loaded = 0;
73
74 if (audioc_cmdline_parser(argc, argv, &conf))
75 goto out;
76 HANDLE_VERSION_FLAG("audioc", conf);
77 cf = configfile_exists();
78 if (cf) {
79 struct audioc_cmdline_parser_params params = {
80 .override = 0,
81 .initialize = 0,
82 .check_required = 0,
83 .check_ambiguity = 0
84 };
85 if (audioc_cmdline_parser_config_file(cf, &conf, &params)) {
86 fprintf(stderr, "parse error in config file\n");
87 exit(EXIT_FAILURE);
88 }
89 }
90 args = conf.inputs_num?
91 concat_args(conf.inputs_num, conf.inputs) :
92 para_strdup("stat");
93 bufsize = conf.bufsize_arg;
94 buf = para_malloc(bufsize);
95
96 if (conf.socket_given) {
97 ret = create_remote_socket(conf.socket_arg);
98 } else {
99 char *hn = para_hostname(),
100 *socket_name = make_message("/var/paraslash/audiod_socket.%s", hn);
101
102 ret = create_remote_socket(socket_name);
103 free(hn);
104 free(socket_name);
105 }
106 if (ret < 0)
107 goto out;
108 fd = ret;
109 ret = mark_fd_nonblocking(fd);
110 if (ret < 0)
111 goto out;
112 ret = mark_fd_nonblocking(STDOUT_FILENO);
113 if (ret < 0)
114 goto out;
115 ret = send_cred_buffer(fd, args);
116 if (ret < 0)
117 goto out;
118 for (;;) {
119 int max_fileno = -1, check_write = 0;
120 ssize_t len;
121 fd_set rfd, wfd;
122 FD_ZERO(&rfd);
123 FD_ZERO(&wfd);
124 if (loaded < bufsize)
125 para_fd_set(fd, &rfd, &max_fileno);
126 if (loaded > 0) {
127 para_fd_set(STDOUT_FILENO, &wfd, &max_fileno);
128 check_write = 1;
129 }
130 ret = -E_AUDIOC_OVERRUN;
131 if (max_fileno < 0)
132 goto out;
133 ret = para_select(max_fileno + 1, &rfd, &wfd, NULL);
134 if (ret < 0)
135 goto out;
136 if (loaded < bufsize && FD_ISSET(fd, &rfd)) {
137 len = recv_bin_buffer(fd, buf + loaded,
138 bufsize - loaded);
139 if (len <= 0) {
140 ret = len < 0? -E_AUDIOC_READ : 0;
141 goto out;
142 }
143 loaded += len;
144 }
145 if (check_write && FD_ISSET(STDOUT_FILENO, &wfd)) {
146 ret = write(STDOUT_FILENO, buf, loaded);
147 if (ret < 0) {
148 ret = -E_AUDIOC_WRITE;
149 goto out;
150 }
151 loaded -= ret;
152 }
153 }
154 out:
155 if (!ret && loaded && buf)
156 ret = write(STDOUT_FILENO, buf, loaded);
157 if (ret < 0)
158 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
159 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
160 }