mdw@git.distorted.org.uk Git - disorder/blob - lib/syscalls.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2005, 2007, 2008 Richard Kettlewell
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file lib/syscalls.c
  19  * @brief Error-checking library call wrappers
  20  */
  21 #include "common.h"
  22
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <sys/time.h>
  29 #include <signal.h>
  30
  31 #include "syscalls.h"
  32 #include "log.h"
  33 #include "printf.h"
  34
  35 int mustnotbeminus1(const char *what, int ret) {
  36   if(ret == -1)
  37     fatal(errno, "error calling %s", what);
  38   return ret;
  39 }
  40
  41 pid_t xfork(void) {
  42   pid_t pid;
  43
  44   if((pid = fork()) < 0) fatal(errno, "error calling fork");
  45   return pid;
  46 }
  47
  48 void xclose_guts(const char *path, int line, int fd) {
  49   if(close(fd) < 0)
  50     fatal(errno, "%s:%d: close %d", path, line, fd);
  51 }
  52
  53 void xdup2(int fd1, int fd2) {
  54   mustnotbeminus1("dup2", dup2(fd1, fd2));
  55 }
  56
  57 void xpipe(int *fdp) {
  58   mustnotbeminus1("pipe", pipe(fdp));
  59 }
  60
  61 void nonblock(int fd) {
  62   mustnotbeminus1("fcntl F_SETFL",
  63                   fcntl(fd, F_SETFL,
  64                         mustnotbeminus1("fcntl F_GETFL",
  65                                         fcntl(fd, F_GETFL)) | O_NONBLOCK));
  66 }
  67
  68 void blocking(int fd) {
  69   mustnotbeminus1("fcntl F_SETFL",
  70                   fcntl(fd, F_SETFL,
  71                         mustnotbeminus1("fcntl F_GETFL",
  72                                         fcntl(fd, F_GETFL)) & ~O_NONBLOCK));
  73 }
  74
  75 void cloexec(int fd) {
  76   mustnotbeminus1("fcntl F_SETFD",
  77                   fcntl(fd, F_SETFD,
  78                         mustnotbeminus1("fcntl F_GETFD",
  79                                         fcntl(fd, F_GETFD)) | FD_CLOEXEC));
  80 }
  81
  82 void xlisten(int fd, int q) {
  83   mustnotbeminus1("listen", listen(fd, q));
  84 }
  85
  86 void xshutdown(int fd, int how) {
  87   mustnotbeminus1("shutdown", shutdown(fd, how));
  88 }
  89
  90 void xsetsockopt(int fd, int l, int o, const void *v, socklen_t vl) {
  91   mustnotbeminus1("setsockopt", setsockopt(fd, l, o, v, vl));
  92 }
  93
  94 int xsocket(int d, int t, int p) {
  95   return mustnotbeminus1("socket", socket(d, t, p));
  96 }
  97
  98 void xconnect(int fd, const struct sockaddr *sa, socklen_t sl) {
  99   mustnotbeminus1("connect", connect(fd, sa, sl));
 100 }
 101
 102 void xsigprocmask(int how, const sigset_t *set, sigset_t *oldset) {
 103   mustnotbeminus1("sigprocmask", sigprocmask(how, set, oldset));
 104 }
 105
 106 void xsigaction(int sig, const struct sigaction *sa, struct sigaction *oldsa) {
 107   mustnotbeminus1("sigaction", sigaction(sig, sa, oldsa));
 108 }
 109
 110 int xprintf(const char *fmt, ...) {
 111   va_list ap;
 112   int n;
 113
 114   va_start(ap, fmt);
 115   n = mustnotbeminus1("byte_vfprintf", byte_vfprintf(stdout, fmt, ap));
 116   va_end(ap);
 117   return n;
 118 }
 119
 120 void xfclose(FILE *fp) {
 121   mustnotbeminus1("fclose", fclose(fp));
 122 }
 123
 124 int xstrtol(long *n, const char *s, char **ep, int base) {
 125   errno = 0;
 126   *n = strtol(s, ep, base);
 127   return errno;
 128 }
 129
 130 int xstrtoll(long_long *n, const char *s, char **ep, int base) {
 131   errno = 0;
 132   *n = strtoll(s, ep, base);
 133   return errno;
 134 }
 135
 136 int xnice(int inc) {
 137   int ret;
 138
 139   /* some versions of nice() return the new nice value which in principle could
 140    * be -1 */
 141   errno = 0;
 142   ret = nice(inc);
 143   if(errno) fatal(errno, "error calling nice");
 144   return ret;
 145 }
 146
 147 void xgettimeofday(struct timeval *tv, struct timezone *tz) {
 148   mustnotbeminus1("gettimeofday", gettimeofday(tv, tz));
 149 }
 150
 151 time_t xtime(time_t *whenp) {
 152   struct timeval tv;
 153
 154   xgettimeofday(&tv, NULL);
 155   if(whenp)
 156     *whenp = tv.tv_sec;
 157   return tv.tv_sec;
 158 }
 159
 160 /*
 161 Local Variables:
 162 c-basic-offset:2
 163 comment-column:40
 164 End:
 165 */