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hush: document a TODO. no code changes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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12
shell/hush.c
12
shell/hush.c
@ -1111,6 +1111,14 @@ static void restore_G_args(save_arg_t *sv, char **argv)
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* Note: as a result, we do not use signal handlers much. The only uses
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* are to count SIGCHLDs
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* and to restore tty pgrp on signal-induced exit.
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*
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* TODO compat:
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* Standard says "When a subshell is entered, traps that are not being ignored
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* are set to the default actions". bash interprets it so that traps which
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* are set to "" (ignore) are NOT reset to defaults. We reset them to default.
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* bash example:
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* # trap '' SYS; (bash -c 'kill -SYS $PPID'; echo YES)
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* YES <-- subshell was not killed by SIGSYS
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*/
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enum {
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SPECIAL_INTERACTIVE_SIGS = 0
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@ -3625,9 +3633,9 @@ static int checkjobs(struct pipe* fg_pipe)
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/* Note: is WIFSIGNALED, WEXITSTATUS = sig + 128 */
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rcode = WEXITSTATUS(status);
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IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
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/* bash prints killing signal's name for *last*
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/* bash prints killer signal's name for *last*
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* process in pipe (prints just newline for SIGINT).
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* Mimic this. Example: "sleep 5" + ^\
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* Mimic this. Example: "sleep 5" + (^\ or kill -QUIT)
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*/
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if (WIFSIGNALED(status)) {
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int sig = WTERMSIG(status);
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