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remove global "jmp_buf die_jmp" from !FEATURE_PREFER_APPLETS builds

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function                                             old     new   delta
xfunc_has_died                                         -      21     +21
sleep_much                                             -      12     +12
sleep10                                                -       9      +9
die_func                                               -       4      +4
fflush_stdout_and_exit                                35      36      +1
builtin_type                                         121     119      -2
die_sleep                                              4       -      -4
xfunc_die                                             60      24     -36
hush_main                                           1128    1011    -117
die_jmp                                              156       -    -156
------------------------------------------------------------------------------
(add/remove: 4/2 grow/shrink: 1/3 up/down: 47/-315)          Total: -268 bytes
   text	   data	    bss	    dec	    hex	filename
 939992	    992	  17652	 958636	  ea0ac	busybox_old
 939880	    992	  17496	 958368	  e9fa0	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2015-10-09 16:42:57 +02:00
parent 4cd99e7c6c
commit 550bf5b4a4
7 changed files with 61 additions and 61 deletions
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25
shell/hush.c
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@@ -1479,10 +1479,11 @@ static sighandler_t install_sighandler(int sig, sighandler_t handler)
#if ENABLE_HUSH_JOB
static void xfunc_has_died(void);
/* After [v]fork, in child: do not restore tty pgrp on xfunc death */
# define disable_restore_tty_pgrp_on_exit() (die_sleep = 0)
# define disable_restore_tty_pgrp_on_exit() (die_func = NULL)
/* After [v]fork, in parent: restore tty pgrp on xfunc death */
# define enable_restore_tty_pgrp_on_exit() (die_sleep = -1)
# define enable_restore_tty_pgrp_on_exit() (die_func = xfunc_has_died)
/* Restores tty foreground process group, and exits.
* May be called as signal handler for fatal signal
@@ -1587,6 +1588,15 @@ static void hush_exit(int exitcode)
#endif
}
static void xfunc_has_died(void) NORETURN;
static void xfunc_has_died(void)
{
/* xfunc has failed! die die die */
/* no EXIT traps, this is an escape hatch! */
G.exiting = 1;
hush_exit(xfunc_error_retval);
}
//TODO: return a mask of ALL handled sigs?
static int check_and_run_traps(void)
@@ -7866,12 +7876,7 @@ int hush_main(int argc, char **argv)
/* Initialize some more globals to non-zero values */
cmdedit_update_prompt();
if (setjmp(die_jmp)) {
/* xfunc has failed! die die die */
/* no EXIT traps, this is an escape hatch! */
G.exiting = 1;
hush_exit(xfunc_error_retval);
}
die_func = xfunc_has_died;
/* Shell is non-interactive at first. We need to call
* install_special_sighandlers() if we are going to execute "sh <script>",
@@ -8129,9 +8134,7 @@ int hush_main(int argc, char **argv)
/* Grab control of the terminal */
tcsetpgrp(G_interactive_fd, getpid());
}
/* -1 is special - makes xfuncs longjmp, not exit
* (we reset die_sleep = 0 whereever we [v]fork) */
enable_restore_tty_pgrp_on_exit(); /* sets die_sleep = -1 */
enable_restore_tty_pgrp_on_exit();
# if ENABLE_HUSH_SAVEHISTORY && MAX_HISTORY > 0
{