common-main.c

   1 #include "cache.h"
   2 #include "exec_cmd.h"
   3
   4 /*
   5  * Many parts of Git have subprograms communicate via pipe, expect the
   6  * upstream of a pipe to die with SIGPIPE when the downstream of a
   7  * pipe does not need to read all that is written.  Some third-party
   8  * programs that ignore or block SIGPIPE for their own reason forget
   9  * to restore SIGPIPE handling to the default before spawning Git and
  10  * break this carefully orchestrated machinery.
  11  *
  12  * Restore the way SIGPIPE is handled to default, which is what we
  13  * expect.
  14  */
  15 static void restore_sigpipe_to_default(void)
  16 {
  17         sigset_t unblock;
  18
  19         sigemptyset(&unblock);
  20         sigaddset(&unblock, SIGPIPE);
  21         sigprocmask(SIG_UNBLOCK, &unblock, NULL);
  22         signal(SIGPIPE, SIG_DFL);
  23 }
  24
  25 int main(int argc, const char **argv)
  26 {
  27         /*
  28          * Always open file descriptors 0/1/2 to avoid clobbering files
  29          * in die().  It also avoids messing up when the pipes are dup'ed
  30          * onto stdin/stdout/stderr in the child processes we spawn.
  31          */
  32         sanitize_stdfds();
  33
  34         git_setup_gettext();
  35
  36         argv[0] = git_extract_argv0_path(argv[0]);
  37
  38         restore_sigpipe_to_default();
  39
  40         return cmd_main(argc, argv);
  41 }