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