code.delx.au - pulseaudio/blob - polyp/util.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdarg.h>
  27 #include <stdlib.h>
  28 #include <signal.h>
  29 #include <errno.h>
  30 #include <assert.h>
  31 #include <string.h>
  32 #include <stdio.h>
  33 #include <fcntl.h>
  34 #include <unistd.h>
  35 #include <sys/types.h>
  36 #include <pwd.h>
  37 #include <signal.h>
  38 #include <pthread.h>
  39 #include <sys/time.h>
  40 #include <sched.h>
  41 #include <sys/resource.h>
  42 #include <limits.h>
  43
  44 #include <samplerate.h>
  45
  46 #include "util.h"
  47 #include "xmalloc.h"
  48 #include "log.h"
  49
  50 void pa_make_nonblock_fd(int fd) {
  51     int v;
  52
  53     if ((v = fcntl(fd, F_GETFL)) >= 0)
  54         if (!(v & O_NONBLOCK))
  55             fcntl(fd, F_SETFL, v|O_NONBLOCK);
  56 }
  57
  58 int pa_make_secure_dir(const char* dir) {
  59     struct stat st;
  60
  61     if (mkdir(dir, 0700) < 0)
  62         if (errno != EEXIST)
  63             return -1;
  64
  65     if (lstat(dir, &st) < 0)
  66         goto fail;
  67
  68     if (!S_ISDIR(st.st_mode) || (st.st_uid != getuid()) || ((st.st_mode & 0777) != 0700))
  69         goto fail;
  70
  71     return 0;
  72
  73 fail:
  74     rmdir(dir);
  75     return -1;
  76 }
  77
  78 ssize_t pa_loop_read(int fd, void*data, size_t size) {
  79     ssize_t ret = 0;
  80     assert(fd >= 0 && data && size);
  81
  82     while (size > 0) {
  83         ssize_t r;
  84
  85         if ((r = read(fd, data, size)) < 0)
  86             return r;
  87
  88         if (r == 0)
  89             break;
  90
  91         ret += r;
  92         data = (uint8_t*) data + r;
  93         size -= r;
  94     }
  95
  96     return ret;
  97 }
  98
  99 ssize_t pa_loop_write(int fd, const void*data, size_t size) {
 100     ssize_t ret = 0;
 101     assert(fd >= 0 && data && size);
 102
 103     while (size > 0) {
 104         ssize_t r;
 105
 106         if ((r = write(fd, data, size)) < 0)
 107             return r;
 108
 109         if (r == 0)
 110             break;
 111
 112         ret += r;
 113         data = (uint8_t*) data + r;
 114         size -= r;
 115     }
 116
 117     return ret;
 118 }
 119
 120 void pa_check_signal_is_blocked(int sig) {
 121     struct sigaction sa;
 122     sigset_t set;
 123
 124 #ifdef HAVE_PTHREAD
 125     if (pthread_sigmask(SIG_SETMASK, NULL, &set) < 0) {
 126 #endif
 127         if (sigprocmask(SIG_SETMASK, NULL, &set) < 0) {
 128             pa_log(__FILE__": sigprocmask() failed: %s\n", strerror(errno));
 129             return;
 130         }
 131 #ifdef HAVE_PTHREAD
 132     }
 133 #endif
 134
 135     if (sigismember(&set, sig))
 136         return;
 137
 138     if (sigaction(sig, NULL, &sa) < 0) {
 139         pa_log(__FILE__": sigaction() failed: %s\n", strerror(errno));
 140         return;
 141     }
 142
 143     if (sa.sa_handler != SIG_DFL)
 144         return;
 145
 146     pa_log(__FILE__": WARNING: %s is not trapped. This might cause malfunction!\n", pa_strsignal(sig));
 147 }
 148
 149 /* The following is based on an example from the GNU libc documentation */
 150 char *pa_sprintf_malloc(const char *format, ...) {
 151     int  size = 100;
 152     char *c = NULL;
 153
 154     assert(format);
 155
 156     for(;;) {
 157         int r;
 158         va_list ap;
 159
 160         c = pa_xrealloc(c, size);
 161
 162         va_start(ap, format);
 163         r = vsnprintf(c, size, format, ap);
 164         va_end(ap);
 165
 166         if (r > -1 && r < size)
 167             return c;
 168
 169         if (r > -1)    /* glibc 2.1 */
 170             size = r+1;
 171         else           /* glibc 2.0 */
 172             size *= 2;
 173     }
 174 }
 175
 176 char *pa_vsprintf_malloc(const char *format, va_list ap) {
 177     int  size = 100;
 178     char *c = NULL;
 179
 180     assert(format);
 181
 182     for(;;) {
 183         int r;
 184         va_list ap;
 185
 186         c = pa_xrealloc(c, size);
 187         r = vsnprintf(c, size, format, ap);
 188
 189         if (r > -1 && r < size)
 190             return c;
 191
 192         if (r > -1)    /* glibc 2.1 */
 193             size = r+1;
 194         else           /* glibc 2.0 */
 195             size *= 2;
 196     }
 197 }
 198
 199
 200 char *pa_get_user_name(char *s, size_t l) {
 201     struct passwd pw, *r;
 202     char buf[1024];
 203     char *p;
 204
 205     if (!(p = getenv("USER")))
 206         if (!(p = getenv("LOGNAME")))
 207             if (!(p = getenv("USERNAME"))) {
 208
 209                 if (getpwuid_r(getuid(), &pw, buf, sizeof(buf), &r) != 0 || !r) {
 210                     snprintf(s, l, "%lu", (unsigned long) getuid());
 211                     return s;
 212                 }
 213
 214                 p = r->pw_name;
 215             }
 216
 217     snprintf(s, l, "%s", p);
 218     return s;
 219 }
 220
 221 char *pa_get_host_name(char *s, size_t l) {
 222     gethostname(s, l);
 223     s[l-1] = 0;
 224     return s;
 225 }
 226
 227 pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b) {
 228     pa_usec_t r;
 229     assert(a && b);
 230
 231     if (pa_timeval_cmp(a, b) < 0) {
 232         const struct timeval *c;
 233         c = a;
 234         a = b;
 235         b = c;
 236     }
 237
 238     r = ((pa_usec_t) a->tv_sec - b->tv_sec)* 1000000;
 239
 240     if (a->tv_usec > b->tv_usec)
 241         r += ((pa_usec_t) a->tv_usec - b->tv_usec);
 242     else if (a->tv_usec < b->tv_usec)
 243         r -= ((pa_usec_t) b->tv_usec - a->tv_usec);
 244
 245     return r;
 246 }
 247
 248 int pa_timeval_cmp(const struct timeval *a, const struct timeval *b) {
 249     assert(a && b);
 250
 251     if (a->tv_sec < b->tv_sec)
 252         return -1;
 253
 254     if (a->tv_sec > b->tv_sec)
 255         return 1;
 256
 257     if (a->tv_usec < b->tv_usec)
 258         return -1;
 259
 260     if (a->tv_usec > b->tv_usec)
 261         return 1;
 262
 263     return 0;
 264 }
 265
 266 pa_usec_t pa_age(const struct timeval *tv) {
 267     struct timeval now;
 268     assert(tv);
 269     gettimeofday(&now, NULL);
 270     return pa_timeval_diff(&now, tv);
 271 }
 272
 273 void pa_timeval_add(struct timeval *tv, pa_usec_t v) {
 274     unsigned long secs;
 275     assert(tv);
 276
 277     secs = (v/1000000);
 278     tv->tv_sec += (unsigned long) secs;
 279     v -= secs*1000000;
 280
 281     tv->tv_usec += v;
 282
 283     while (tv->tv_usec >= 1000000) {
 284         tv->tv_sec++;
 285         tv->tv_usec -= 1000000;
 286     }
 287 }
 288
 289 #define NICE_LEVEL (-15)
 290
 291 void pa_raise_priority(void) {
 292     if (setpriority(PRIO_PROCESS, 0, NICE_LEVEL) < 0)
 293         pa_log(__FILE__": setpriority() failed: %s\n", strerror(errno));
 294     else
 295         pa_log(__FILE__": Successfully gained nice level %i.\n", NICE_LEVEL);
 296
 297 #ifdef _POSIX_PRIORITY_SCHEDULING
 298     {
 299         struct sched_param sp;
 300
 301         if (sched_getparam(0, &sp) < 0) {
 302             pa_log(__FILE__": sched_getparam() failed: %s\n", strerror(errno));
 303             return;
 304         }
 305
 306         sp.sched_priority = 1;
 307         if (sched_setscheduler(0, SCHED_FIFO, &sp) < 0) {
 308             pa_log(__FILE__": sched_setscheduler() failed: %s\n", strerror(errno));
 309             return;
 310         }
 311
 312         pa_log(__FILE__": Successfully enabled SCHED_FIFO scheduling.\n");
 313     }
 314 #endif
 315 }
 316
 317 void pa_reset_priority(void) {
 318 #ifdef _POSIX_PRIORITY_SCHEDULING
 319     {
 320         struct sched_param sp;
 321         sched_getparam(0, &sp);
 322         sp.sched_priority = 0;
 323         sched_setscheduler(0, SCHED_OTHER, &sp);
 324     }
 325 #endif
 326
 327     setpriority(PRIO_PROCESS, 0, 0);
 328 }
 329
 330 int pa_fd_set_cloexec(int fd, int b) {
 331     int v;
 332     assert(fd >= 0);
 333
 334     if ((v = fcntl(fd, F_GETFD, 0)) < 0)
 335         return -1;
 336
 337     v = (v & ~FD_CLOEXEC) | (b ? FD_CLOEXEC : 0);
 338
 339     if (fcntl(fd, F_SETFD, v) < 0)
 340         return -1;
 341
 342     return 0;
 343 }
 344
 345 char *pa_get_binary_name(char *s, size_t l) {
 346     char path[PATH_MAX];
 347     int i;
 348     assert(s && l);
 349
 350     /* This works on Linux only */
 351
 352     snprintf(path, sizeof(path), "/proc/%u/exe", (unsigned) getpid());
 353     if ((i = readlink(path, s, l-1)) < 0)
 354         return NULL;
 355
 356     s[i] = 0;
 357     return s;
 358 }
 359
 360 char *pa_path_get_filename(const char *p) {
 361     char *fn;
 362
 363     if ((fn = strrchr(p, '/')))
 364         return fn+1;
 365
 366     return (char*) p;
 367 }
 368
 369 int pa_parse_boolean(const char *v) {
 370
 371     if (!strcmp(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
 372         return 1;
 373     else if (!strcmp(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
 374         return 0;
 375
 376     return -1;
 377 }
 378
 379 char *pa_split(const char *c, const char *delimiter, const char**state) {
 380     const char *current = *state ? *state : c;
 381     size_t l;
 382
 383     if (!*current)
 384         return NULL;
 385
 386     l = strcspn(current, delimiter);
 387     *state = current+l;
 388
 389     if (**state)
 390         (*state)++;
 391
 392     return pa_xstrndup(current, l);
 393 }
 394
 395 #define WHITESPACE " \t\n"
 396
 397 char *pa_split_spaces(const char *c, const char **state) {
 398     const char *current = *state ? *state : c;
 399     size_t l;
 400
 401     if (!*current)
 402         return NULL;
 403
 404     current += strspn(current, WHITESPACE);
 405     l = strcspn(current, WHITESPACE);
 406
 407     *state = current+l;
 408
 409     return pa_xstrndup(current, l);
 410 }
 411
 412 const char *pa_strsignal(int sig) {
 413     switch(sig) {
 414         case SIGINT: return "SIGINT";
 415         case SIGTERM: return "SIGTERM";
 416         case SIGUSR1: return "SIGUSR1";
 417         case SIGUSR2: return "SIGUSR2";
 418         case SIGXCPU: return "SIGXCPU";
 419         case SIGPIPE: return "SIGPIPE";
 420         case SIGCHLD: return "SIGCHLD";
 421         default: return "UNKNOWN SIGNAL";
 422     }
 423 }
 424
 425 int pa_parse_resample_method(const char *string) {
 426     assert(string);
 427
 428     if (!strcmp(string, "sinc-best-quality"))
 429         return SRC_SINC_BEST_QUALITY;
 430     else if (!strcmp(string, "sinc-medium-quality"))
 431         return SRC_SINC_MEDIUM_QUALITY;
 432     else if (!strcmp(string, "sinc-fastest"))
 433         return SRC_SINC_FASTEST;
 434     else if (!strcmp(string, "zero-order-hold"))
 435         return SRC_ZERO_ORDER_HOLD;
 436     else if (!strcmp(string, "linear"))
 437         return SRC_LINEAR;
 438     else
 439         return -1;
 440 }