9bc80d706
Denis Vlasenko
2008-04-12
Subject
ash: add FEATURE_SH_NOFORK support
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shell/Config.in+17 -0
| @@ -287,6 +287,23 @@ config FEATURE_SH_STANDALONE | |
| # that exact location with that exact name, this option will not work at | |
| # all. | |
| + | config FEATURE_SH_NOFORK |
| + | bool "Run 'nofork' applets directly" |
| + | default n |
| + | depends on (MSH || LASH || HUSH || ASH) && FEATURE_PREFER_APPLETS |
| + | help |
| + | This option causes busybox shells [currently only ash] |
| + | to not execute typical fork/exec/wait sequence, but call <applet>_main |
| + | directly, if possible. (Sometimes it is not possible: for example, |
| + | this is not possible in pipes). |
| + | |
| + | This will be done only for some applets (those which are marked |
| + | NOFORK in include/applets.h). |
| + | |
| + | This may significantly speed up some shell scripts. |
| + | |
| + | This feature is relatively new. Use with care. |
| + | |
| config CTTYHACK | |
| bool "cttyhack" | |
| default n | |
shell/ash.c+18 -0
| @@ -8747,6 +8747,24 @@ evalcommand(union node *cmd, int flags) | |
| /* Execute the command. */ | |
| switch (cmdentry.cmdtype) { | |
| default: | |
| + | |
| + | #if ENABLE_FEATURE_SH_NOFORK |
| + | { |
| + | /* TODO: don't rerun find_applet_by_name, find_command |
| + | * already did it. Make it save applet_no somewhere */ |
| + | int applet_no = find_applet_by_name(argv[0]); |
| + | if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) { |
| + | struct nofork_save_area nofork_save; |
| + | |
| + | listsetvar(varlist.list, VEXPORT|VSTACK); |
| + | save_nofork_data(&nofork_save); |
| + | /* run <applet>_main(), then restore nofork_save_area */ |
| + | exitstatus = run_nofork_applet_prime(&nofork_save, applet_no, argv) & 0xff; |
| + | break; |
| + | } |
| + | } |
| + | #endif |
| + | |
| /* Fork off a child process if necessary. */ | |
| if (!(flags & EV_EXIT) || trap[0]) { | |
| INT_OFF; | |