*: introduce and use xfork() and xvfork()

function                                             old     new   delta
launch_helper                                        170     169      -1
setup_heredoc                                        312     302     -10
handle_dir_common                                    367     354     -13
expand_vars_to_list                                 2456    2443     -13
open_transformer                                      89      74     -15
data_extract_to_command                              439     423     -16
do_ipaddr                                           1406    1389     -17
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/7 up/down: 0/-85)             Total: -85 bytes

Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 12 insertions, 15 deletions

diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index 8102ea2dc..5c2c529c9 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/libbb/vfork_daemon_rexec.c
@@ -224,26 +224,12 @@ pid_t FAST_FUNC fork_or_rexec(char **argv)
         /* Maybe we are already re-execed and come here again? */
         if (re_execed)
                 return 0;
-        pid = vfork();
-        if (pid < 0) /* wtf? */
-                bb_perror_msg_and_die("vfork");
+        pid = xvfork();
         if (pid) /* parent */
                 return pid;
         /* child - re-exec ourself */
         re_exec(argv);
 }
-#else
-/* Dance around (void)...*/
-#undef fork_or_rexec
-pid_t FAST_FUNC fork_or_rexec(void)
-{
-        pid_t pid;
-        pid = fork();
-        if (pid < 0) /* wtf? */
-                bb_perror_msg_and_die("fork");
-        return pid;
-}
-#define fork_or_rexec(argv) fork_or_rexec()
 #endif
 
 /* Due to a #define in libbb.h on MMU systems we actually have 1 argument -
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index f021493b1..7069a7c8e 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -589,3 +589,14 @@ void FAST_FUNC generate_uuid(uint8_t *buf)
         /* variant = 10x */
         buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80;
 }
+
+#if BB_MMU
+pid_t FAST_FUNC xfork(void)
+{
+        pid_t pid;
+        pid = fork();
+        if (pid < 0) /* wtf? */
+                bb_perror_msg_and_die("vfork"+1);
+        return pid;
+}
+#endif