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     disorder_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)
  45     disorder_fatal(errno, "error calling fork");
  46   return pid;
  47 }
  48
  49 void xclose_guts(const char *path, int line, int fd) {
  50   if(close(fd) < 0)
  51     disorder_fatal(errno, "%s:%d: close %d", path, line, 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 blocking(int fd) {
  70   mustnotbeminus1("fcntl F_SETFL",
  71                   fcntl(fd, F_SETFL,
  72                         mustnotbeminus1("fcntl F_GETFL",
  73                                         fcntl(fd, F_GETFL)) & ~O_NONBLOCK));
  74 }
  75
  76 void cloexec(int fd) {
  77   mustnotbeminus1("fcntl F_SETFD",
  78                   fcntl(fd, F_SETFD,
  79                         mustnotbeminus1("fcntl F_GETFD",
  80                                         fcntl(fd, F_GETFD)) | FD_CLOEXEC));
  81 }
  82
  83 void xlisten(int fd, int q) {
  84   mustnotbeminus1("listen", listen(fd, q));
  85 }
  86
  87 void xshutdown(int fd, int how) {
  88   mustnotbeminus1("shutdown", shutdown(fd, how));
  89 }
  90
  91 void xsetsockopt(int fd, int l, int o, const void *v, socklen_t vl) {
  92   mustnotbeminus1("setsockopt", setsockopt(fd, l, o, v, vl));
  93 }
  94
  95 int xsocket(int d, int t, int p) {
  96   return mustnotbeminus1("socket", socket(d, t, p));
  97 }
  98
  99 void xconnect(int fd, const struct sockaddr *sa, socklen_t sl) {
 100   mustnotbeminus1("connect", connect(fd, sa, sl));
 101 }
 102
 103 void xsigprocmask(int how, const sigset_t *set, sigset_t *oldset) {
 104   mustnotbeminus1("sigprocmask", sigprocmask(how, set, oldset));
 105 }
 106
 107 void xsigaction(int sig, const struct sigaction *sa, struct sigaction *oldsa) {
 108   mustnotbeminus1("sigaction", sigaction(sig, sa, oldsa));
 109 }
 110
 111 int xprintf(const char *fmt, ...) {
 112   va_list ap;
 113   int n;
 114
 115   va_start(ap, fmt);
 116   n = mustnotbeminus1("byte_vfprintf", byte_vfprintf(stdout, fmt, ap));
 117   va_end(ap);
 118   return n;
 119 }
 120
 121 void xfclose(FILE *fp) {
 122   mustnotbeminus1("fclose", fclose(fp));
 123 }
 124
 125 int xstrtol(long *n, const char *s, char **ep, int base) {
 126   errno = 0;
 127   *n = strtol(s, ep, base);
 128   return errno;
 129 }
 130
 131 int xstrtoll(long_long *n, const char *s, char **ep, int base) {
 132   errno = 0;
 133   *n = strtoll(s, ep, base);
 134   return errno;
 135 }
 136
 137 int xnice(int inc) {
 138   int ret;
 139
 140   /* some versions of nice() return the new nice value which in principle could
 141    * be -1 */
 142   errno = 0;
 143   ret = nice(inc);
 144   if(errno)
 145     disorder_fatal(errno, "error calling nice");
 146   return ret;
 147 }
 148
 149 void xgettimeofday(struct timeval *tv, struct timezone *tz) {
 150   mustnotbeminus1("gettimeofday", gettimeofday(tv, tz));
 151 }
 152
 153 time_t xtime(time_t *whenp) {
 154   struct timeval tv;
 155
 156   xgettimeofday(&tv, NULL);
 157   if(whenp)
 158     *whenp = tv.tv_sec;
 159   return tv.tv_sec;
 160 }
 161
 162 /*
 163 Local Variables:
 164 c-basic-offset:2
 165 comment-column:40
 166 End:
 167 */