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
  19 #include "common.h"
  20
  21 #include <unistd.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26 #include <sys/time.h>
  27 #include <signal.h>
  28
  29 #include "syscalls.h"
  30 #include "log.h"
  31 #include "printf.h"
  32
  33 int mustnotbeminus1(const char *what, int ret) {
  34   if(ret == -1)
  35     fatal(errno, "error calling %s", what);
  36   return ret;
  37 }
  38
  39 pid_t xfork(void) {
  40   pid_t pid;
  41
  42   if((pid = fork()) < 0) fatal(errno, "error calling fork");
  43   return pid;
  44 }
  45
  46 void xclose_guts(const char *path, int line, int fd) {
  47   if(close(fd) < 0)
  48     fatal(errno, "%s:%d: close %d", path, line, fd);
  49 }
  50
  51 void xdup2(int fd1, int fd2) {
  52   mustnotbeminus1("dup2", dup2(fd1, fd2));
  53 }
  54
  55 void xpipe(int *fdp) {
  56   mustnotbeminus1("pipe", pipe(fdp));
  57 }
  58
  59 void nonblock(int fd) {
  60   mustnotbeminus1("fcntl F_SETFL",
  61                   fcntl(fd, F_SETFL,
  62                         mustnotbeminus1("fcntl F_GETFL",
  63                                         fcntl(fd, F_GETFL)) | O_NONBLOCK));
  64 }
  65
  66 void blocking(int fd) {
  67   mustnotbeminus1("fcntl F_SETFL",
  68                   fcntl(fd, F_SETFL,
  69                         mustnotbeminus1("fcntl F_GETFL",
  70                                         fcntl(fd, F_GETFL)) & ~O_NONBLOCK));
  71 }
  72
  73 void cloexec(int fd) {
  74   mustnotbeminus1("fcntl F_SETFD",
  75                   fcntl(fd, F_SETFD,
  76                         mustnotbeminus1("fcntl F_GETFD",
  77                                         fcntl(fd, F_GETFD)) | FD_CLOEXEC));
  78 }
  79
  80 void xlisten(int fd, int q) {
  81   mustnotbeminus1("listen", listen(fd, q));
  82 }
  83
  84 void xshutdown(int fd, int how) {
  85   mustnotbeminus1("shutdown", shutdown(fd, how));
  86 }
  87
  88 void xsetsockopt(int fd, int l, int o, const void *v, socklen_t vl) {
  89   mustnotbeminus1("setsockopt", setsockopt(fd, l, o, v, vl));
  90 }
  91
  92 int xsocket(int d, int t, int p) {
  93   return mustnotbeminus1("socket", socket(d, t, p));
  94 }
  95
  96 void xconnect(int fd, const struct sockaddr *sa, socklen_t sl) {
  97   mustnotbeminus1("connect", connect(fd, sa, sl));
  98 }
  99
 100 void xsigprocmask(int how, const sigset_t *set, sigset_t *oldset) {
 101   mustnotbeminus1("sigprocmask", sigprocmask(how, set, oldset));
 102 }
 103
 104 void xsigaction(int sig, const struct sigaction *sa, struct sigaction *oldsa) {
 105   mustnotbeminus1("sigaction", sigaction(sig, sa, oldsa));
 106 }
 107
 108 int xprintf(const char *fmt, ...) {
 109   va_list ap;
 110   int n;
 111
 112   va_start(ap, fmt);
 113   n = mustnotbeminus1("byte_vfprintf", byte_vfprintf(stdout, fmt, ap));
 114   va_end(ap);
 115   return n;
 116 }
 117
 118 void xfclose(FILE *fp) {
 119   mustnotbeminus1("fclose", fclose(fp));
 120 }
 121
 122 int xstrtol(long *n, const char *s, char **ep, int base) {
 123   errno = 0;
 124   *n = strtol(s, ep, base);
 125   return errno;
 126 }
 127
 128 int xstrtoll(long_long *n, const char *s, char **ep, int base) {
 129   errno = 0;
 130   *n = strtoll(s, ep, base);
 131   return errno;
 132 }
 133
 134 int xnice(int inc) {
 135   int ret;
 136
 137   /* some versions of nice() return the new nice value which in principle could
 138    * be -1 */
 139   errno = 0;
 140   ret = nice(inc);
 141   if(errno) fatal(errno, "error calling nice");
 142   return ret;
 143 }
 144
 145 void xgettimeofday(struct timeval *tv, struct timezone *tz) {
 146   mustnotbeminus1("gettimeofday", gettimeofday(tv, tz));
 147 }
 148
 149 /*
 150 Local Variables:
 151 c-basic-offset:2
 152 comment-column:40
 153 End:
 154 */