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