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
  40 #include "util.h"
  41 #include "xmalloc.h"
  42
  43 void pa_make_nonblock_fd(int fd) {
  44     int v;
  45
  46     if ((v = fcntl(fd, F_GETFL)) >= 0)
  47         if (!(v & O_NONBLOCK))
  48             fcntl(fd, F_SETFL, v|O_NONBLOCK);
  49 }
  50
  51 int pa_make_secure_dir(const char* dir) {
  52     struct stat st;
  53
  54     if (mkdir(dir, 0700) < 0)
  55         if (errno != EEXIST)
  56             return -1;
  57
  58     if (lstat(dir, &st) < 0)
  59         goto fail;
  60
  61     if (!S_ISDIR(st.st_mode) || (st.st_uid != getuid()) || ((st.st_mode & 0777) != 0700))
  62         goto fail;
  63
  64     return 0;
  65
  66 fail:
  67     rmdir(dir);
  68     return -1;
  69 }
  70
  71 ssize_t pa_loop_read(int fd, void*data, size_t size) {
  72     ssize_t ret = 0;
  73     assert(fd >= 0 && data && size);
  74
  75     while (size > 0) {
  76         ssize_t r;
  77
  78         if ((r = read(fd, data, size)) < 0)
  79             return r;
  80
  81         if (r == 0)
  82             break;
  83
  84         ret += r;
  85         data += r;
  86         size -= r;
  87     }
  88
  89     return ret;
  90 }
  91
  92 ssize_t pa_loop_write(int fd, const void*data, size_t size) {
  93     ssize_t ret = 0;
  94     assert(fd >= 0 && data && size);
  95
  96     while (size > 0) {
  97         ssize_t r;
  98
  99         if ((r = write(fd, data, size)) < 0)
 100             return r;
 101
 102         if (r == 0)
 103             break;
 104
 105         ret += r;
 106         data += r;
 107         size -= r;
 108     }
 109
 110     return ret;
 111 }
 112
 113 void pa_check_for_sigpipe(void) {
 114     struct sigaction sa;
 115     sigset_t set;
 116
 117     if (pthread_sigmask(SIG_SETMASK, NULL, &set) < 0) {
 118         if (sigprocmask(SIG_SETMASK, NULL, &set) < 0) {
 119             fprintf(stderr, __FILE__": sigprocmask() failed: %s\n", strerror(errno));
 120             return;
 121         }
 122     }
 123
 124     if (sigismember(&set, SIGPIPE))
 125         return;
 126
 127     if (sigaction(SIGPIPE, NULL, &sa) < 0) {
 128         fprintf(stderr, __FILE__": sigaction() failed: %s\n", strerror(errno));
 129         return;
 130     }
 131
 132     if (sa.sa_handler != SIG_DFL)
 133         return;
 134
 135     fprintf(stderr, "polypaudio: WARNING: SIGPIPE is not trapped. This might cause malfunction!\n");
 136 }
 137
 138 /* The following is based on an example from the GNU libc documentation */
 139 char *pa_sprintf_malloc(const char *format, ...) {
 140     int  size = 100;
 141     char *c = NULL;
 142
 143     assert(format);
 144
 145     for(;;) {
 146         int r;
 147         va_list ap;
 148
 149         c = pa_xrealloc(c, size);
 150
 151         va_start(ap, format);
 152         r = vsnprintf(c, size, format, ap);
 153         va_end(ap);
 154
 155         if (r > -1 && r < size)
 156             return c;
 157
 158         if (r > -1)    /* glibc 2.1 */
 159             size = r+1;
 160         else           /* glibc 2.0 */
 161             size *= 2;
 162     }
 163 }
 164
 165 char *pa_get_user_name(char *s, size_t l) {
 166     struct passwd pw, *r;
 167     char buf[1024];
 168     char *p;
 169
 170     if (!(p = getenv("USER")))
 171         if (!(p = getenv("LOGNAME")))
 172             if (!(p = getenv("USERNAME"))) {
 173
 174                 if (getpwuid_r(getuid(), &pw, buf, sizeof(buf), &r) != 0 || !r) {
 175                     snprintf(s, l, "%lu", (unsigned long) getuid());
 176                     return s;
 177                 }
 178
 179                 p = r->pw_name;
 180             }
 181
 182     snprintf(s, l, "%s", p);
 183     return s;
 184 }
 185
 186 char *pa_get_host_name(char *s, size_t l) {
 187     gethostname(s, l);
 188     s[l-1] = 0;
 189     return s;
 190 }