para_write: Return proper error code.
[paraslash.git] / para.h
1 /*
2 * Copyright (C) 1997-2011 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file para.h global paraslash definitions */
8
9 #include "config.h"
10
11 #include <sys/stat.h>
12 #include <fcntl.h>
13 #include <sys/wait.h>
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <time.h> /* time(), localtime() */
17 #include <unistd.h>
18 #include <errno.h>
19 #include <limits.h>
20 #include <stdarg.h>
21 #include <ctype.h>
22 #include <netinet/in.h>
23 #include <arpa/inet.h>
24 #include <sys/socket.h>
25 #include <sys/un.h> /* needed by create_pf_socket */
26 #include <string.h>
27 #include <assert.h>
28 #include "gcc-compat.h"
29
30 /** used in various contexts */
31 #define MAXLINE 255
32
33 /** Compute the minimum of \a x and \a y. */
34 #define PARA_MIN(x, y) ({ \
35 typeof(x) _min1 = (x); \
36 typeof(y) _min2 = (y); \
37 (void) (&_min1 == &_min2); \
38 _min1 < _min2 ? _min1 : _min2; })
39
40 /** Compute the maximum of \a x and \a y. */
41 #define PARA_MAX(x, y) ({ \
42 typeof(x) _max1 = (x); \
43 typeof(y) _max2 = (y); \
44 (void) (&_max1 == &_max2); \
45 _max1 < _max2 ? _max2 : _max1; })
46
47 /** Compute the absolute value of \a x. */
48 #define PARA_ABS(x) ({ \
49 typeof(x) _x = (x); \
50 _x > 0? _x : -_x; })
51
52 /**
53 * Define a standard log function that always writes to stderr.
54 *
55 * \param loglevel_barrier If the loglevel of the current message
56 * is less than that, the message is going to be ignored.
57 *
58 */
59 #define INIT_STDERR_LOGGING(loglevel_barrier) \
60 __printf_2_3 void para_log(int ll, const char* fmt,...) \
61 { \
62 va_list argp; \
63 if (ll < loglevel_barrier) \
64 return; \
65 va_start(argp, fmt); \
66 vfprintf(stderr, fmt, argp); \
67 va_end(argp); \
68 }
69
70 /** Version text used by various commands if -V switch was given. */
71 #define VERSION_TEXT(prefix) "para_" prefix " " PACKAGE_VERSION \
72 " (" GIT_VERSION ": " CODENAME ")" "\n" \
73 "Copyright (C) 2011 Andre Noll\n" \
74 "This is free software with ABSOLUTELY NO WARRANTY." \
75 " See COPYING for details.\n" \
76 "Written by Andre Noll.\n" \
77 "Report bugs to <maan@systemlinux.org>.\n"
78
79 /** Print out \p VERSION_TEXT and exit if version flag was given. */
80 #define HANDLE_VERSION_FLAG(_prefix, _args_info_struct) \
81 if (_args_info_struct.version_given) { \
82 printf("%s", VERSION_TEXT(_prefix)); \
83 exit(EXIT_SUCCESS); \
84 }
85
86 /** Sent by para_client to initiate the authentication procedure. */
87 #define AUTH_REQUEST_MSG "auth rsa "
88 /** Sent by para_server for commands that expect a data file. */
89 #define AWAITING_DATA_MSG "\nAwaiting Data."
90 /** Sent by para_server if authentication was successful. */
91 #define PROCEED_MSG "Proceed."
92 /** Length of the \p PROCEED_MSG string. */
93 #define PROCEED_MSG_LEN strlen(PROCEED_MSG)
94 /** Sent by para_client to indicate the end of the command line. */
95 #define EOC_MSG "\nEnd of Command."
96
97 /* exec */
98 int para_exec_cmdline_pid(pid_t *pid, const char *cmdline, int *fds);
99
100 /* time */
101 int tv_diff(const struct timeval *b, const struct timeval *a, struct timeval *diff);
102 long unsigned tv2ms(const struct timeval*);
103 void d2tv(double, struct timeval*);
104 void tv_add(const struct timeval*, const struct timeval *, struct timeval *);
105 void tv_scale(const unsigned long, const struct timeval *, struct timeval *);
106 void tv_divide(const unsigned long divisor, const struct timeval *tv,
107 struct timeval *result);
108 int tv_convex_combination(const long a, const struct timeval *tv1,
109 const long b, const struct timeval *tv2,
110 struct timeval *result);
111 void ms2tv(const long unsigned n, struct timeval *tv);
112 void compute_chunk_time(long unsigned chunk_num,
113 struct timeval *chunk_tv, struct timeval *stream_start,
114 struct timeval *result);
115
116 /** The enum of all status items. */
117 enum status_items {STATUS_ITEM_ENUM NUM_STAT_ITEMS};
118 extern const char *status_item_list[];
119 /** Loop over each status item. */
120 #define FOR_EACH_STATUS_ITEM(i) for (i = 0; i < NUM_STAT_ITEMS; i++)
121 int for_each_stat_item(char *item_buf, size_t num_bytes,
122 int (*item_handler)(int, char *));
123
124 __printf_2_3 void para_log(int, const char*, ...);
125
126 /**
127 * Write a log message to a dynamically allocated string.
128 *
129 * \param fmt Usual format string.
130 * \param p Result pointer.
131 *
132 * \sa printf(3). */
133 #define PARA_VSPRINTF(fmt, p) \
134 { \
135 int n; \
136 size_t size = 100; \
137 p = para_malloc(size); \
138 while (1) { \
139 va_list ap; \
140 /* Try to print in the allocated space. */ \
141 va_start(ap, fmt); \
142 n = vsnprintf(p, size, fmt, ap); \
143 va_end(ap); \
144 /* If that worked, return the string. */ \
145 if (n > -1 && n < size) \
146 break; \
147 /* Else try again with more space. */ \
148 if (n > -1) /* glibc 2.1 */ \
149 size = n + 1; /* precisely what is needed */ \
150 else /* glibc 2.0 */ \
151 size *= 2; /* twice the old size */ \
152 p = para_realloc(p, size); \
153 } \
154 }
155
156 /**
157 * Return a random non-negative integer in an interval.
158 *
159 * \param max Determines maximal possible return value.
160 *
161 * \return An integer between zero and \p max - 1, inclusively.
162 */
163 _static_inline_ long int para_random(unsigned max)
164 {
165 return ((max + 0.0) * (random() / (RAND_MAX + 1.0)));
166 }
167
168 /** Round up x to next multiple of y. */
169 #define ROUND_UP(x, y) ({ \
170 const typeof(y) _divisor = y; \
171 ((x) + _divisor - 1) / _divisor * _divisor; })
172
173 /** Round down x to multiple of y. */
174 #define ROUND_DOWN(x, y) ({ \
175 const typeof(y) _divisor = y; \
176 (x) / _divisor * _divisor; })
177
178 /** Divide and round up to next integer. */
179 #define DIV_ROUND_UP(x, y) ({ \
180 typeof(y) _divisor = y; \
181 ((x) + _divisor - 1) / _divisor; })
182
183 /**
184 * Assert a build-time dependency, as an expression.
185 *
186 * \param cond The compile-time condition which must be true.
187 *
188 * Compilation will fail if the condition isn't true, or can't be evaluated by
189 * the compiler. This can be used in an expression: its value is "0".
190 *
191 * Taken from ccan.
192 */
193 #define EXPR_BUILD_ASSERT(cond) (sizeof(char [1 - 2 * !(cond)]) - 1)
194
195 /* &a[0] degrades to a pointer: a different type from an array */
196 #define _array_size_chk(arr) EXPR_BUILD_ASSERT(\
197 !__builtin_types_compatible_p(typeof(arr), typeof(&(arr)[0])))
198 /** Get the size of an array */
199 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + _array_size_chk(arr))
200
201 /**
202 * Wrapper for isspace.
203 * NetBSD needs this.
204 */
205 /*
206 * The values should be cast to an unsigned char first, then to int.
207 * Why? Because the isdigit (as do all other is/to functions/macros)
208 * expect a number from 0 upto and including 255 as their (int) argument.
209 * Because char is signed on most systems, casting it to int immediately
210 * gives the functions an argument between -128 and 127 (inclusive),
211 * which they will use as an array index, and which will thus fail
212 * horribly for characters which have their most significant bit set.
213 */
214 #define para_isspace(c) isspace((int)(unsigned char)(c))
215
216 /** Data that indicates an eof-condition for a fec-encoded stream. */
217 #define FEC_EOF_PACKET "\xec\x0d\xcc\xfe\0\0\0\0" \
218 "\0\0\0\0\0\0\0\0" "\0\0\0\0\0\0\0\0" "\0\0\0\0\0\0\0\0"
219 #define FEC_EOF_PACKET_LEN 32
220
221 /** Used to avoid a shortcoming in vim's syntax highlighting. */
222 #define EMBRACE(...) { __VA_ARGS__}
223
224 /**
225 * The sample formats supported by paraslash.
226 *
227 * It may be determined by one of the following sources:
228 *
229 * 1. The decoding filter (para_audiod only). In this case, it is always
230 * \p SF_S16_LE which is the canonical format used within decoders.
231 *
232 * 2. The wav header (para_write only).
233 *
234 * 3. The --format option of para_write.
235 */
236 #define SAMPLE_FORMATS \
237 SAMPLE_FORMAT(SF_S8, "8 bit signed"), \
238 SAMPLE_FORMAT(SF_U8, "8 bit unsigned"), \
239 SAMPLE_FORMAT(SF_S16_LE, "16 bit signed, little endian"), \
240 SAMPLE_FORMAT(SF_S16_BE, "16 bit signed, big endian"), \
241 SAMPLE_FORMAT(SF_U16_LE, "16 bit unsigned, little endian"), \
242 SAMPLE_FORMAT(SF_U16_BE, "16 bit unsigned, big endian"), \
243
244 #define SAMPLE_FORMAT(a, b) a
245 enum sample_format {SAMPLE_FORMATS};
246 #undef SAMPLE_FORMAT
247 #define SAMPLE_FORMAT(a, b) b
248
249 /** Debug loglevel, gets really noisy. */
250 #define LL_DEBUG 0
251 /** Still noisy, but won't fill your disk. */
252 #define LL_INFO 1
253 /** Normal, but significant event. */
254 #define LL_NOTICE 2
255 /** Unexpected event that can be handled. */
256 #define LL_WARNING 3
257 /** Unhandled error condition. */
258 #define LL_ERROR 4
259 /** System might be unreliable. */
260 #define LL_CRIT 5
261 /** Last message before exit. */
262 #define LL_EMERG 6
263 /** Number of all loglevels. */
264 #define NUM_LOGLEVELS 7
265
266 /** Log messages with lower priority than that will not be compiled in. */
267 #define COMPILE_TIME_LOGLEVEL 0
268
269 /** \cond */
270 #if LL_DEBUG >= COMPILE_TIME_LOGLEVEL
271 #define PARA_DEBUG_LOG(f,...) para_log(LL_DEBUG, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
272 #else
273 #define PARA_DEBUG_LOG(...) do {;} while (0)
274 #endif
275
276 #if LL_INFO >= COMPILE_TIME_LOGLEVEL
277 #define PARA_INFO_LOG(f,...) para_log(LL_INFO, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
278 #else
279 #define PARA_INFO_LOG(...) do {;} while (0)
280 #endif
281
282 #if LL_NOTICE >= COMPILE_TIME_LOGLEVEL
283 #define PARA_NOTICE_LOG(f,...) para_log(LL_NOTICE, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
284 #else
285 #define PARA_NOTICE_LOG(...) do {;} while (0)
286 #endif
287
288 #if LL_WARNING >= COMPILE_TIME_LOGLEVEL
289 #define PARA_WARNING_LOG(f,...) para_log(LL_WARNING, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
290 #else
291 #define PARA_WARNING_LOG(...) do {;} while (0)
292 #endif
293
294 #if LL_ERROR >= COMPILE_TIME_LOGLEVEL
295 #define PARA_ERROR_LOG(f,...) para_log(LL_ERROR, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
296 #else
297 #define PARA_ERROR_LOG(...) do {;} while (0)
298 #endif
299
300 #if LL_CRIT >= COMPILE_TIME_LOGLEVEL
301 #define PARA_CRIT_LOG(f,...) para_log(LL_CRIT, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
302 #else
303 #define PARA_CRIT_LOG(...) do {;} while (0)
304 #endif
305
306 #if LL_EMERG >= COMPILE_TIME_LOGLEVEL
307 #define PARA_EMERG_LOG(f,...) para_log(LL_EMERG, "%s: " f, __FUNCTION__, ## __VA_ARGS__)
308 #else
309 #define PARA_EMERG_LOG(...)
310 #endif
311 /** \endcond */