10 * Many parts of Git have subprograms communicate via pipe, expect the
11 * upstream of a pipe to die with SIGPIPE when the downstream of a
12 * pipe does not need to read all that is written. Some third-party
13 * programs that ignore or block SIGPIPE for their own reason forget
14 * to restore SIGPIPE handling to the default before spawning Git and
15 * break this carefully orchestrated machinery.
17 * Restore the way SIGPIPE is handled to default, which is what we
20 static void restore_sigpipe_to_default(void)
24 sigemptyset(&unblock
);
25 sigaddset(&unblock
, SIGPIPE
);
26 sigprocmask(SIG_UNBLOCK
, &unblock
, NULL
);
27 signal(SIGPIPE
, SIG_DFL
);
30 int main(int argc
, const char **argv
)
33 struct strbuf tmp
= STRBUF_INIT
;
35 trace2_initialize_clock();
38 * Always open file descriptors 0/1/2 to avoid clobbering files
39 * in die(). It also avoids messing up when the pipes are dup'ed
40 * onto stdin/stdout/stderr in the child processes we spawn.
43 restore_sigpipe_to_default();
45 git_resolve_executable_dir(argv
[0]);
47 setlocale(LC_CTYPE
, "");
50 initialize_the_repository();
55 trace2_cmd_start(argv
);
56 trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP
);
58 if (!strbuf_getcwd(&tmp
))
59 tmp_original_cwd
= strbuf_detach(&tmp
, NULL
);
61 result
= cmd_main(argc
, argv
);
63 /* Not exit(3), but a wrapper calling our common_exit() */
67 static void check_bug_if_BUG(void)
69 if (!bug_called_must_BUG
)
71 BUG("on exit(): had bug() call(s) in this process without explicit BUG_if_bug()");
74 /* We wrap exit() to call common_exit() in git-compat-util.h */
75 int common_exit(const char *file
, int line
, int code
)
78 * For non-POSIX systems: Take the lowest 8 bits of the "code"
79 * to e.g. turn -1 into 255. On a POSIX system this is
80 * redundant, see exit(3) and wait(2), but as it doesn't harm
81 * anything there we don't need to guard this with an "ifdef".
86 trace2_cmd_exit_fl(file
, line
, code
);