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

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2005 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 2 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, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * 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, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include <config.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 #include <stdio.h>
  31 #include <stdlib.h>
  32
  33 #include "syscalls.h"
  34 #include "log.h"
  35 #include "printf.h"
  36
  37 int mustnotbeminus1(const char *what, int ret) {
  38   if(ret == -1)
  39     fatal(errno, "error calling %s", what);
  40   return ret;
  41 }
  42
  43 pid_t xfork(void) {
  44   pid_t pid;
  45
  46   if((pid = fork()) < 0) fatal(errno, "error calling fork");
  47   return pid;
  48 }
  49
  50 void xclose(int fd) {
  51   mustnotbeminus1("close", close(fd));
  52 }
  53
  54 void xdup2(int fd1, int fd2) {
  55   mustnotbeminus1("dup2", dup2(fd1, fd2));
  56 }
  57
  58 void xpipe(int *fdp) {
  59   mustnotbeminus1("pipe", pipe(fdp));
  60 }
  61
  62 void nonblock(int fd) {
  63   mustnotbeminus1("fcntl F_SETFL",
  64                   fcntl(fd, F_SETFL,
  65                         mustnotbeminus1("fcntl F_GETFL",
  66                                         fcntl(fd, F_GETFL)) | O_NONBLOCK));
  67 }
  68
  69 void cloexec(int fd) {
  70   mustnotbeminus1("fcntl F_SETFD",
  71                   fcntl(fd, F_SETFD,
  72                         mustnotbeminus1("fcntl F_GETFD",
  73                                         fcntl(fd, F_GETFD)) | FD_CLOEXEC));
  74 }
  75
  76 void xlisten(int fd, int q) {
  77   mustnotbeminus1("listen", listen(fd, q));
  78 }
  79
  80 void xshutdown(int fd, int how) {
  81   mustnotbeminus1("shutdown", shutdown(fd, how));
  82 }
  83
  84 void xsetsockopt(int fd, int l, int o, const void *v, socklen_t vl) {
  85   mustnotbeminus1("setsockopt", setsockopt(fd, l, o, v, vl));
  86 }
  87
  88 int xsocket(int d, int t, int p) {
  89   return mustnotbeminus1("socket", socket(d, t, p));
  90 }
  91
  92 void xconnect(int fd, const struct sockaddr *sa, socklen_t sl) {
  93   mustnotbeminus1("connect", connect(fd, sa, sl));
  94 }
  95
  96 void xsigprocmask(int how, const sigset_t *set, sigset_t *oldset) {
  97   mustnotbeminus1("sigprocmask", sigprocmask(how, set, oldset));
  98 }
  99
 100 void xsigaction(int sig, const struct sigaction *sa, struct sigaction *oldsa) {
 101   mustnotbeminus1("sigaction", sigaction(sig, sa, oldsa));
 102 }
 103
 104 int xprintf(const char *fmt, ...) {
 105   va_list ap;
 106   int n;
 107
 108   va_start(ap, fmt);
 109   n = mustnotbeminus1("byte_vfprintf", byte_vfprintf(stdout, fmt, ap));
 110   va_end(ap);
 111   return n;
 112 }
 113
 114 void xfclose(FILE *fp) {
 115   mustnotbeminus1("fclose", fclose(fp));
 116 }
 117
 118 int xstrtol(long *n, const char *s, char **ep, int base) {
 119   errno = 0;
 120   *n = strtol(s, ep, base);
 121   return errno;
 122 }
 123
 124 int xstrtoll(long_long *n, const char *s, char **ep, int base) {
 125   errno = 0;
 126   *n = strtoll(s, ep, base);
 127   return errno;
 128 }
 129
 130 int xnice(int inc) {
 131   int ret;
 132
 133   /* some versions of nice() return the new nice value which in principle could
 134    * be -1 */
 135   errno = 0;
 136   ret = nice(inc);
 137   if(errno) fatal(errno, "error calling nice");
 138   return ret;
 139 }
 140
 141 void xgettimeofday(struct timeval *tv, struct timezone *tz) {
 142   mustnotbeminus1("gettimeofday", gettimeofday(tv, tz));
 143 }
 144
 145 /*
 146 Local Variables:
 147 c-basic-offset:2
 148 comment-column:40
 149 End:
 150 */