format-patch: improve head calculation for cover-letter

diff --git a/write_or_die.c b/write_or_die.c
index 960f448cffd9ffd4e53763dfed3669bc374b8620..b50f99a9361926d2116c85e3e90a132fb9dab742 100644 (file)
--- a/write_or_die.c
+++ b/write_or_die.c
@@ -1,5 +1,15 @@
 #include "cache.h"
 
+static void check_pipe(int err)
+{
+       if (err == EPIPE) {
+               signal(SIGPIPE, SIG_DFL);
+               raise(SIGPIPE);
+               /* Should never happen, but just in case... */
+               exit(141);
+       }
+}
+
 /*
  * Some cases use stdio, but want to flush after the write
  * to get error handling (and to get better interactive
@@ -34,8 +44,7 @@ void maybe_flush_or_die(FILE *f, const char *desc)
                        return;
        }
        if (fflush(f)) {
-               if (errno == EPIPE)
-                       exit(0);
+               check_pipe(errno);
                die_errno("write failure on '%s'", desc);
        }
 }
@@ -50,8 +59,7 @@ void fsync_or_die(int fd, const char *msg)
 void write_or_die(int fd, const void *buf, size_t count)
 {
        if (write_in_full(fd, buf, count) < 0) {
-               if (errno == EPIPE)
-                       exit(0);
+               check_pipe(errno);
                die_errno("write error");
        }
 }
@@ -59,8 +67,7 @@ void write_or_die(int fd, const void *buf, size_t count)
 int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
 {
        if (write_in_full(fd, buf, count) < 0) {
-               if (errno == EPIPE)
-                       exit(0);
+               check_pipe(errno);
                fprintf(stderr, "%s: write error (%s)\n",
                        msg, strerror(errno));
                return 0;