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
  37 #include "util.h"
  38
  39 void pa_make_nonblock_fd(int fd) {
  40     int v;
  41
  42     if ((v = fcntl(fd, F_GETFL)) >= 0)
  43         if (!(v & O_NONBLOCK))
  44             fcntl(fd, F_SETFL, v|O_NONBLOCK);
  45 }
  46
  47 int pa_make_secure_dir(const char* dir) {
  48     struct stat st;
  49
  50     if (mkdir(dir, 0700) < 0)
  51         if (errno != EEXIST)
  52             return -1;
  53
  54     if (lstat(dir, &st) < 0)
  55         goto fail;
  56
  57     if (!S_ISDIR(st.st_mode) || (st.st_uid != getuid()) || ((st.st_mode & 0777) != 0700))
  58         goto fail;
  59
  60     return 0;
  61
  62 fail:
  63     rmdir(dir);
  64     return -1;
  65 }
  66
  67 ssize_t pa_loop_read(int fd, void*data, size_t size) {
  68     ssize_t ret = 0;
  69     assert(fd >= 0 && data && size);
  70
  71     while (size > 0) {
  72         ssize_t r;
  73
  74         if ((r = read(fd, data, size)) < 0)
  75             return r;
  76
  77         if (r == 0)
  78             break;
  79
  80         ret += r;
  81         data += r;
  82         size -= r;
  83     }
  84
  85     return ret;
  86 }
  87
  88 ssize_t pa_loop_write(int fd, const void*data, size_t size) {
  89     ssize_t ret = 0;
  90     assert(fd >= 0 && data && size);
  91
  92     while (size > 0) {
  93         ssize_t r;
  94
  95         if ((r = write(fd, data, size)) < 0)
  96             return r;
  97
  98         if (r == 0)
  99             break;
 100
 101         ret += r;
 102         data += r;
 103         size -= r;
 104     }
 105
 106     return ret;
 107 }
 108
 109 void pa_check_for_sigpipe(void) {
 110     struct sigaction sa;
 111
 112     if (sigaction(SIGPIPE, NULL, &sa) < 0) {
 113         fprintf(stderr, __FILE__": sigaction() failed: %s\n", strerror(errno));
 114         return;
 115     }
 116
 117     if (sa.sa_handler == SIG_DFL)
 118         fprintf(stderr, "polypaudio: WARNING: SIGPIPE is not trapped. This might cause malfunction!\n");
 119 }
 120
 121 /* The following is based on an example from the GNU libc documentation */
 122 char *pa_sprintf_malloc(const char *format, ...) {
 123     int  size = 100;
 124     char *c = NULL;
 125
 126     assert(format);
 127
 128     for(;;) {
 129         int r;
 130         va_list ap;
 131
 132         c = realloc(c, size);
 133         assert(c);
 134
 135         va_start(ap, format);
 136         r = vsnprintf(c, size, format, ap);
 137         va_end(ap);
 138
 139         if (r > -1 && r < size)
 140             return c;
 141
 142         if (r > -1)    /* glibc 2.1 */
 143             size = r+1;
 144         else           /* glibc 2.0 */
 145             size *= 2;
 146     }
 147 }