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

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2005, 2007-9, 2013 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 #if HAVE_UNISTD_H
  24 # include <unistd.h>
  25 #endif
  26 #include <errno.h>
  27 #include <fcntl.h>
  28 #include <sys/types.h>
  29 #if HAVE_SYS_SOCKET_H
  30 # include <sys/socket.h>
  31 #endif
  32 #if HAVE_SYS_TIME_H
  33 # include <sys/time.h>
  34 #endif
  35 #include <signal.h>
  36 #include <time.h>
  37
  38 #include "syscalls.h"
  39 #include "log.h"
  40 #include "printf.h"
  41
  42 int mustnotbeminus1(const char *what, int ret) {
  43   if(ret == -1)
  44     disorder_fatal(errno, "error calling %s", what);
  45   return ret;
  46 }
  47
  48 pid_t xfork(void) {
  49   pid_t pid;
  50
  51   if((pid = fork()) < 0)
  52     disorder_fatal(errno, "error calling fork");
  53   return pid;
  54 }
  55
  56 void xclose_guts(const char *path, int line, int fd) {
  57   if(close(fd) < 0)
  58     disorder_fatal(errno, "%s:%d: close %d", path, line, fd);
  59 }
  60
  61 void xdup2(int fd1, int fd2) {
  62   mustnotbeminus1("dup2", dup2(fd1, fd2));
  63 }
  64
  65 void xpipe(int *fdp) {
  66   mustnotbeminus1("pipe", pipe(fdp));
  67 }
  68
  69 void nonblock(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 blocking(int fd) {
  77   mustnotbeminus1("fcntl F_SETFL",
  78                   fcntl(fd, F_SETFL,
  79                         mustnotbeminus1("fcntl F_GETFL",
  80                                         fcntl(fd, F_GETFL)) & ~O_NONBLOCK));
  81 }
  82
  83 void cloexec(int fd) {
  84   mustnotbeminus1("fcntl F_SETFD",
  85                   fcntl(fd, F_SETFD,
  86                         mustnotbeminus1("fcntl F_GETFD",
  87                                         fcntl(fd, F_GETFD)) | FD_CLOEXEC));
  88 }
  89
  90 void xlisten(int fd, int q) {
  91   mustnotbeminus1("listen", listen(fd, q));
  92 }
  93
  94 void xshutdown(int fd, int how) {
  95   mustnotbeminus1("shutdown", shutdown(fd, how));
  96 }
  97
  98 void xsetsockopt(int fd, int l, int o, const void *v, socklen_t vl) {
  99   mustnotbeminus1("setsockopt", setsockopt(fd, l, o, v, vl));
 100 }
 101
 102 int xsocket(int d, int t, int p) {
 103   return mustnotbeminus1("socket", socket(d, t, p));
 104 }
 105
 106 void xconnect(int fd, const struct sockaddr *sa, socklen_t sl) {
 107   mustnotbeminus1("connect", connect(fd, sa, sl));
 108 }
 109
 110 void xsigprocmask(int how, const sigset_t *set, sigset_t *oldset) {
 111   mustnotbeminus1("sigprocmask", sigprocmask(how, set, oldset));
 112 }
 113
 114 void xsigaction(int sig, const struct sigaction *sa, struct sigaction *oldsa) {
 115   mustnotbeminus1("sigaction", sigaction(sig, sa, oldsa));
 116 }
 117
 118 int xprintf(const char *fmt, ...) {
 119   va_list ap;
 120   int n;
 121
 122   va_start(ap, fmt);
 123   n = mustnotbeminus1("byte_vfprintf", byte_vfprintf(stdout, fmt, ap));
 124   va_end(ap);
 125   return n;
 126 }
 127
 128 void xfclose(FILE *fp) {
 129   mustnotbeminus1("fclose", fclose(fp));
 130 }
 131
 132 int xstrtol(long *n, const char *s, char **ep, int base) {
 133   errno = 0;
 134   *n = strtol(s, ep, base);
 135   return errno;
 136 }
 137
 138 int xstrtoll(long_long *n, const char *s, char **ep, int base) {
 139   errno = 0;
 140   *n = strtoll(s, ep, base);
 141   return errno;
 142 }
 143
 144 int xnice(int inc) {
 145   int ret;
 146
 147   /* some versions of nice() return the new nice value which in principle could
 148    * be -1 */
 149   errno = 0;
 150   ret = nice(inc);
 151   if(errno)
 152     disorder_fatal(errno, "error calling nice");
 153   return ret;
 154 }
 155
 156 void xgettimeofday(struct timeval *tv, struct timezone *tz) {
 157   mustnotbeminus1("gettimeofday", gettimeofday(tv, tz));
 158 }
 159
 160 time_t xtime(time_t *whenp) {
 161   struct timeval tv;
 162
 163   xgettimeofday(&tv, NULL);
 164   if(whenp)
 165     *whenp = tv.tv_sec;
 166   return tv.tv_sec;
 167 }
 168
 169 void xnanosleep(const struct timespec *req, struct timespec *rem) {
 170   mustnotbeminus1("nanosleep", nanosleep(req, rem));
 171 }
 172
 173 /*
 174 Local Variables:
 175 c-basic-offset:2
 176 comment-column:40
 177 End:
 178 */