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 "util.h"
  45 #include "xmalloc.h"
  46 #include "log.h"
  47
  48 void pa_make_nonblock_fd(int fd) {
  49     int v;
  50
  51     if ((v = fcntl(fd, F_GETFL)) >= 0)
  52         if (!(v & O_NONBLOCK))
  53             fcntl(fd, F_SETFL, v|O_NONBLOCK);
  54 }
  55
  56 int pa_make_secure_dir(const char* dir) {
  57     struct stat st;
  58
  59     if (mkdir(dir, 0700) < 0)
  60         if (errno != EEXIST)
  61             return -1;
  62
  63     if (lstat(dir, &st) < 0)
  64         goto fail;
  65
  66     if (!S_ISDIR(st.st_mode) || (st.st_uid != getuid()) || ((st.st_mode & 0777) != 0700))
  67         goto fail;
  68
  69     return 0;
  70
  71 fail:
  72     rmdir(dir);
  73     return -1;
  74 }
  75
  76 ssize_t pa_loop_read(int fd, void*data, size_t size) {
  77     ssize_t ret = 0;
  78     assert(fd >= 0 && data && size);
  79
  80     while (size > 0) {
  81         ssize_t r;
  82
  83         if ((r = read(fd, data, size)) < 0)
  84             return r;
  85
  86         if (r == 0)
  87             break;
  88
  89         ret += r;
  90         data = (uint8_t*) data + r;
  91         size -= r;
  92     }
  93
  94     return ret;
  95 }
  96
  97 ssize_t pa_loop_write(int fd, const void*data, size_t size) {
  98     ssize_t ret = 0;
  99     assert(fd >= 0 && data && size);
 100
 101     while (size > 0) {
 102         ssize_t r;
 103
 104         if ((r = write(fd, data, size)) < 0)
 105             return r;
 106
 107         if (r == 0)
 108             break;
 109
 110         ret += r;
 111         data = (uint8_t*) data + r;
 112         size -= r;
 113     }
 114
 115     return ret;
 116 }
 117
 118 void pa_check_for_sigpipe(void) {
 119     struct sigaction sa;
 120     sigset_t set;
 121
 122 #ifdef HAVE_PTHREAD
 123     if (pthread_sigmask(SIG_SETMASK, NULL, &set) < 0) {
 124 #endif
 125         if (sigprocmask(SIG_SETMASK, NULL, &set) < 0) {
 126             pa_log(__FILE__": sigprocmask() failed: %s\n", strerror(errno));
 127             return;
 128         }
 129 #ifdef HAVE_PTHREAD
 130     }
 131 #endif
 132
 133     if (sigismember(&set, SIGPIPE))
 134         return;
 135
 136     if (sigaction(SIGPIPE, NULL, &sa) < 0) {
 137         pa_log(__FILE__": sigaction() failed: %s\n", strerror(errno));
 138         return;
 139     }
 140
 141     if (sa.sa_handler != SIG_DFL)
 142         return;
 143
 144     pa_log(__FILE__": WARNING: SIGPIPE is not trapped. This might cause malfunction!\n");
 145 }
 146
 147 /* The following is based on an example from the GNU libc documentation */
 148 char *pa_sprintf_malloc(const char *format, ...) {
 149     int  size = 100;
 150     char *c = NULL;
 151
 152     assert(format);
 153
 154     for(;;) {
 155         int r;
 156         va_list ap;
 157
 158         c = pa_xrealloc(c, size);
 159
 160         va_start(ap, format);
 161         r = vsnprintf(c, size, format, ap);
 162         va_end(ap);
 163
 164         if (r > -1 && r < size)
 165             return c;
 166
 167         if (r > -1)    /* glibc 2.1 */
 168             size = r+1;
 169         else           /* glibc 2.0 */
 170             size *= 2;
 171     }
 172 }
 173
 174 char *pa_vsprintf_malloc(const char *format, va_list ap) {
 175     int  size = 100;
 176     char *c = NULL;
 177
 178     assert(format);
 179
 180     for(;;) {
 181         int r;
 182         va_list ap;
 183
 184         c = pa_xrealloc(c, size);
 185         r = vsnprintf(c, size, format, ap);
 186
 187         if (r > -1 && r < size)
 188             return c;
 189
 190         if (r > -1)    /* glibc 2.1 */
 191             size = r+1;
 192         else           /* glibc 2.0 */
 193             size *= 2;
 194     }
 195 }
 196
 197
 198 char *pa_get_user_name(char *s, size_t l) {
 199     struct passwd pw, *r;
 200     char buf[1024];
 201     char *p;
 202
 203     if (!(p = getenv("USER")))
 204         if (!(p = getenv("LOGNAME")))
 205             if (!(p = getenv("USERNAME"))) {
 206
 207                 if (getpwuid_r(getuid(), &pw, buf, sizeof(buf), &r) != 0 || !r) {
 208                     snprintf(s, l, "%lu", (unsigned long) getuid());
 209                     return s;
 210                 }
 211
 212                 p = r->pw_name;
 213             }
 214
 215     snprintf(s, l, "%s", p);
 216     return s;
 217 }
 218
 219 char *pa_get_host_name(char *s, size_t l) {
 220     gethostname(s, l);
 221     s[l-1] = 0;
 222     return s;
 223 }
 224
 225 pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b) {
 226     pa_usec_t r;
 227     assert(a && b);
 228
 229     if (pa_timeval_cmp(a, b) < 0) {
 230         const struct timeval *c;
 231         c = a;
 232         a = b;
 233         b = c;
 234     }
 235
 236     r = ((pa_usec_t) a->tv_sec - b->tv_sec)* 1000000;
 237
 238     if (a->tv_usec > b->tv_usec)
 239         r += ((pa_usec_t) a->tv_usec - b->tv_usec);
 240     else if (a->tv_usec < b->tv_usec)
 241         r -= ((pa_usec_t) b->tv_usec - a->tv_usec);
 242
 243     return r;
 244 }
 245
 246 int pa_timeval_cmp(const struct timeval *a, const struct timeval *b) {
 247     assert(a && b);
 248
 249     if (a->tv_sec < b->tv_sec)
 250         return -1;
 251
 252     if (a->tv_sec > b->tv_sec)
 253         return 1;
 254
 255     if (a->tv_usec < b->tv_usec)
 256         return -1;
 257
 258     if (a->tv_usec > b->tv_usec)
 259         return 1;
 260
 261     return 0;
 262 }
 263
 264 pa_usec_t pa_age(const struct timeval *tv) {
 265     struct timeval now;
 266     assert(tv);
 267     gettimeofday(&now, NULL);
 268     return pa_timeval_diff(&now, tv);
 269 }
 270
 271 void pa_timeval_add(struct timeval *tv, pa_usec_t v) {
 272     unsigned long secs;
 273     assert(tv);
 274
 275     secs = (v/1000000);
 276     tv->tv_sec += (unsigned long) secs;
 277     v -= secs*1000000;
 278
 279     tv->tv_usec += v;
 280
 281     while (tv->tv_usec >= 1000000) {
 282         tv->tv_sec++;
 283         tv->tv_usec -= 1000000;
 284     }
 285 }
 286
 287 #define NICE_LEVEL (-15)
 288
 289 void pa_raise_priority(void) {
 290     if (setpriority(PRIO_PROCESS, 0, NICE_LEVEL) < 0)
 291         pa_log(__FILE__": setpriority() failed: %s\n", strerror(errno));
 292     else
 293         pa_log(__FILE__": Successfully gained nice level %i.\n", NICE_LEVEL);
 294
 295 #ifdef _POSIX_PRIORITY_SCHEDULING
 296     {
 297         struct sched_param sp;
 298
 299         if (sched_getparam(0, &sp) < 0) {
 300             pa_log(__FILE__": sched_getparam() failed: %s\n", strerror(errno));
 301             return;
 302         }
 303
 304         sp.sched_priority = 1;
 305         if (sched_setscheduler(0, SCHED_FIFO, &sp) < 0) {
 306             pa_log(__FILE__": sched_setscheduler() failed: %s\n", strerror(errno));
 307             return;
 308         }
 309
 310         pa_log(__FILE__": Successfully enabled SCHED_FIFO scheduling.\n");
 311     }
 312 #endif
 313 }
 314
 315 void pa_reset_priority(void) {
 316 #ifdef _POSIX_PRIORITY_SCHEDULING
 317     {
 318         struct sched_param sp;
 319         sched_getparam(0, &sp);
 320         sp.sched_priority = 0;
 321         sched_setscheduler(0, SCHED_OTHER, &sp);
 322     }
 323 #endif
 324
 325     setpriority(PRIO_PROCESS, 0, 0);
 326 }
 327
 328 int pa_fd_set_cloexec(int fd, int b) {
 329     int v;
 330     assert(fd >= 0);
 331
 332     if ((v = fcntl(fd, F_GETFD, 0)) < 0)
 333         return -1;
 334
 335     v = (v & ~FD_CLOEXEC) | (b ? FD_CLOEXEC : 0);
 336
 337     if (fcntl(fd, F_SETFD, v) < 0)
 338         return -1;
 339
 340     return 0;
 341 }
 342
 343 char *pa_get_binary_name(char *s, size_t l) {
 344     char path[PATH_MAX];
 345     int i;
 346     assert(s && l);
 347
 348     /* This works on Linux only */
 349
 350     snprintf(path, sizeof(path), "/proc/%u/exe", (unsigned) getpid());
 351     if ((i = readlink(path, s, l-1)) < 0)
 352         return NULL;
 353
 354     s[i] = 0;
 355     return s;
 356 }
 357
 358 char *pa_path_get_filename(const char *p) {
 359     char *fn;
 360
 361     if ((fn = strrchr(p, '/')))
 362         return fn+1;
 363
 364     return (char*) p;
 365 }
 366
 367 int pa_parse_boolean(const char *v) {
 368
 369     if (!strcmp(v, "1") || !strcasecmp(v, "yes") || !strcasecmp(v, "y") || !strcasecmp(v, "on"))
 370         return 1;
 371     else if (!strcmp(v, "0") || !strcasecmp(v, "no") || !strcasecmp(v, "n") || !strcasecmp(v, "off"))
 372         return 0;
 373
 374     return -1;
 375 }
 376
 377 char *pa_split(const char *c, const char *delimiter, const char**state) {
 378     const char *current = *state ? *state : c;
 379     size_t l;
 380
 381     if (!*current)
 382         return NULL;
 383
 384     l = strcspn(current, delimiter);
 385     *state = current+l;
 386
 387     if (**state)
 388         *state++;
 389
 390     return pa_xstrndup(current, l);
 391 }