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
  43 #include "util.h"
  44 #include "xmalloc.h"
  45 #include "log.h"
  46
  47 void pa_make_nonblock_fd(int fd) {
  48     int v;
  49
  50     if ((v = fcntl(fd, F_GETFL)) >= 0)
  51         if (!(v & O_NONBLOCK))
  52             fcntl(fd, F_SETFL, v|O_NONBLOCK);
  53 }
  54
  55 int pa_make_secure_dir(const char* dir) {
  56     struct stat st;
  57
  58     if (mkdir(dir, 0700) < 0)
  59         if (errno != EEXIST)
  60             return -1;
  61
  62     if (lstat(dir, &st) < 0)
  63         goto fail;
  64
  65     if (!S_ISDIR(st.st_mode) || (st.st_uid != getuid()) || ((st.st_mode & 0777) != 0700))
  66         goto fail;
  67
  68     return 0;
  69
  70 fail:
  71     rmdir(dir);
  72     return -1;
  73 }
  74
  75 ssize_t pa_loop_read(int fd, void*data, size_t size) {
  76     ssize_t ret = 0;
  77     assert(fd >= 0 && data && size);
  78
  79     while (size > 0) {
  80         ssize_t r;
  81
  82         if ((r = read(fd, data, size)) < 0)
  83             return r;
  84
  85         if (r == 0)
  86             break;
  87
  88         ret += r;
  89         data = (uint8_t*) data + r;
  90         size -= r;
  91     }
  92
  93     return ret;
  94 }
  95
  96 ssize_t pa_loop_write(int fd, const void*data, size_t size) {
  97     ssize_t ret = 0;
  98     assert(fd >= 0 && data && size);
  99
 100     while (size > 0) {
 101         ssize_t r;
 102
 103         if ((r = write(fd, data, size)) < 0)
 104             return r;
 105
 106         if (r == 0)
 107             break;
 108
 109         ret += r;
 110         data = (uint8_t*) data + r;
 111         size -= r;
 112     }
 113
 114     return ret;
 115 }
 116
 117 void pa_check_for_sigpipe(void) {
 118     struct sigaction sa;
 119     sigset_t set;
 120
 121 #ifdef HAVE_PTHREAD
 122     if (pthread_sigmask(SIG_SETMASK, NULL, &set) < 0) {
 123 #endif
 124         if (sigprocmask(SIG_SETMASK, NULL, &set) < 0) {
 125             pa_log(__FILE__": sigprocmask() failed: %s\n", strerror(errno));
 126             return;
 127         }
 128 #ifdef HAVE_PTHREAD
 129     }
 130 #endif
 131
 132     if (sigismember(&set, SIGPIPE))
 133         return;
 134
 135     if (sigaction(SIGPIPE, NULL, &sa) < 0) {
 136         pa_log(__FILE__": sigaction() failed: %s\n", strerror(errno));
 137         return;
 138     }
 139
 140     if (sa.sa_handler != SIG_DFL)
 141         return;
 142
 143     pa_log(__FILE__": WARNING: SIGPIPE is not trapped. This might cause malfunction!\n");
 144 }
 145
 146 /* The following is based on an example from the GNU libc documentation */
 147 char *pa_sprintf_malloc(const char *format, ...) {
 148     int  size = 100;
 149     char *c = NULL;
 150
 151     assert(format);
 152
 153     for(;;) {
 154         int r;
 155         va_list ap;
 156
 157         c = pa_xrealloc(c, size);
 158
 159         va_start(ap, format);
 160         r = vsnprintf(c, size, format, ap);
 161         va_end(ap);
 162
 163         if (r > -1 && r < size)
 164             return c;
 165
 166         if (r > -1)    /* glibc 2.1 */
 167             size = r+1;
 168         else           /* glibc 2.0 */
 169             size *= 2;
 170     }
 171 }
 172
 173 char *pa_vsprintf_malloc(const char *format, va_list ap) {
 174     int  size = 100;
 175     char *c = NULL;
 176
 177     assert(format);
 178
 179     for(;;) {
 180         int r;
 181         va_list ap;
 182
 183         c = pa_xrealloc(c, size);
 184         r = vsnprintf(c, size, format, ap);
 185
 186         if (r > -1 && r < size)
 187             return c;
 188
 189         if (r > -1)    /* glibc 2.1 */
 190             size = r+1;
 191         else           /* glibc 2.0 */
 192             size *= 2;
 193     }
 194 }
 195
 196
 197 char *pa_get_user_name(char *s, size_t l) {
 198     struct passwd pw, *r;
 199     char buf[1024];
 200     char *p;
 201
 202     if (!(p = getenv("USER")))
 203         if (!(p = getenv("LOGNAME")))
 204             if (!(p = getenv("USERNAME"))) {
 205
 206                 if (getpwuid_r(getuid(), &pw, buf, sizeof(buf), &r) != 0 || !r) {
 207                     snprintf(s, l, "%lu", (unsigned long) getuid());
 208                     return s;
 209                 }
 210
 211                 p = r->pw_name;
 212             }
 213
 214     snprintf(s, l, "%s", p);
 215     return s;
 216 }
 217
 218 char *pa_get_host_name(char *s, size_t l) {
 219     gethostname(s, l);
 220     s[l-1] = 0;
 221     return s;
 222 }
 223
 224 uint32_t pa_age(struct timeval *tv) {
 225     struct timeval now;
 226     uint32_t r;
 227     assert(tv);
 228
 229     if (tv->tv_sec == 0)
 230         return 0;
 231
 232     gettimeofday(&now, NULL);
 233
 234     r = (now.tv_sec-tv->tv_sec) * 1000000;
 235
 236     if (now.tv_usec >= tv->tv_usec)
 237         r += now.tv_usec - tv->tv_usec;
 238     else
 239         r -= tv->tv_usec - now.tv_usec;
 240
 241     return r;
 242 }
 243
 244 #define NICE_LEVEL (-15)
 245
 246 void pa_raise_priority(void) {
 247     if (setpriority(PRIO_PROCESS, 0, NICE_LEVEL) < 0)
 248         pa_log(__FILE__": setpriority() failed: %s\n", strerror(errno));
 249     else
 250         pa_log(__FILE__": Successfully gained nice level %i.\n", NICE_LEVEL);
 251
 252 #ifdef _POSIX_PRIORITY_SCHEDULING
 253     {
 254         struct sched_param sp;
 255
 256         if (sched_getparam(0, &sp) < 0) {
 257             pa_log(__FILE__": sched_getparam() failed: %s\n", strerror(errno));
 258             return;
 259         }
 260
 261         sp.sched_priority = 1;
 262         if (sched_setscheduler(0, SCHED_FIFO, &sp) < 0) {
 263             pa_log(__FILE__": sched_setscheduler() failed: %s\n", strerror(errno));
 264             return;
 265         }
 266
 267         pa_log(__FILE__": Successfully enabled SCHED_FIFO scheduling.\n");
 268     }
 269 #endif
 270 }
 271
 272 void pa_reset_priority(void) {
 273 #ifdef _POSIX_PRIORITY_SCHEDULING
 274     {
 275         struct sched_param sp;
 276         sched_getparam(0, &sp);
 277         sp.sched_priority = 0;
 278         sched_setscheduler(0, SCHED_OTHER, &sp);
 279     }
 280 #endif
 281
 282     setpriority(PRIO_PROCESS, 0, 0);
 283 }
 284
 285 int pa_fd_set_cloexec(int fd, int b) {
 286     int v;
 287     assert(fd >= 0);
 288
 289     if ((v = fcntl(fd, F_GETFD, 0)) < 0)
 290         return -1;
 291
 292     v = (v & ~FD_CLOEXEC) | (b ? FD_CLOEXEC : 0);
 293
 294     if (fcntl(fd, F_SETFD, v) < 0)
 295         return -1;
 296
 297     return 0;
 298 }