1 #include "cache.h"
2 #include "exec-cmd.h"
3 #include "attr.h"
4 
5 /*
6  * Many parts of Git have subprograms communicate via pipe, expect the
7  * upstream of a pipe to die with SIGPIPE when the downstream of a
8  * pipe does not need to read all that is written.  Some third-party
9  * programs that ignore or block SIGPIPE for their own reason forget
10  * to restore SIGPIPE handling to the default before spawning Git and
11  * break this carefully orchestrated machinery.
12  *
13  * Restore the way SIGPIPE is handled to default, which is what we
14  * expect.
15  */
restore_sigpipe_to_default(void)16 static void restore_sigpipe_to_default(void)
17 {
18 	sigset_t unblock;
19 
20 	sigemptyset(&unblock);
21 	sigaddset(&unblock, SIGPIPE);
22 	sigprocmask(SIG_UNBLOCK, &unblock, NULL);
23 	signal(SIGPIPE, SIG_DFL);
24 }
25 
main(int argc,const char ** argv)26 int main(int argc, const char **argv)
27 {
28 	int result;
29 
30 	trace2_initialize_clock();
31 
32 	/*
33 	 * Always open file descriptors 0/1/2 to avoid clobbering files
34 	 * in die().  It also avoids messing up when the pipes are dup'ed
35 	 * onto stdin/stdout/stderr in the child processes we spawn.
36 	 */
37 	sanitize_stdfds();
38 	restore_sigpipe_to_default();
39 
40 	git_resolve_executable_dir(argv[0]);
41 
42 	git_setup_gettext();
43 
44 	initialize_the_repository();
45 
46 	attr_start();
47 
48 	trace2_initialize();
49 	trace2_cmd_start(argv);
50 	trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP);
51 
52 	result = cmd_main(argc, argv);
53 
54 	trace2_cmd_exit(result);
55 
56 	return result;
57 }
58