sh: Make expansion errors in optimized command substitution non-fatal.
Command substitutions consisting of a single simple command are executed in the main shell process but this should be invisible apart from performance and very few exceptions such as $(trap).
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commit
45b71cd16e
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=216761
@ -578,6 +578,8 @@ evalbackcmd(union node *n, struct backcmd *result)
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int pip[2];
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struct job *jp;
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struct stackmark smark; /* unnecessary */
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struct jmploc jmploc;
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struct jmploc *savehandler;
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setstackmark(&smark);
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result->fd = -1;
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@ -590,7 +592,19 @@ evalbackcmd(union node *n, struct backcmd *result)
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}
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if (n->type == NCMD) {
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exitstatus = oexitstatus;
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savehandler = handler;
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if (setjmp(jmploc.loc)) {
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if (exception == EXERROR || exception == EXEXEC)
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exitstatus = 2;
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else if (exception != 0) {
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handler = savehandler;
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longjmp(handler->loc, 1);
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}
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} else {
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handler = &jmploc;
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evalcommand(n, EV_BACKCMD, result);
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}
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handler = savehandler;
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} else {
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exitstatus = 0;
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if (pipe(pip) < 0)
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5
tools/regression/bin/sh/expansion/cmdsubst5.0
Normal file
5
tools/regression/bin/sh/expansion/cmdsubst5.0
Normal file
@ -0,0 +1,5 @@
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# $FreeBSD$
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unset v
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exec 2>/dev/null
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! y=$(: ${v?})
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