Author: jilles
Date: Thu Jun 16 21:50:28 2011
New Revision: 223163
URL: http://svn.freebsd.org/changeset/base/223163
Log:
sh: Reduce unnecessary forks with eval.
The eval special builtin now runs the code with EV_EXIT if it was run
with EV_EXIT itself.
In particular, this eliminates one fork when a command substitution contains
an eval command that ends with an external program or a subshell.
This is similar to what r220978 did for functions.
Added:
head/tools/regression/bin/sh/expansion/cmdsubst11.0 (contents, props
changed)
Modified:
head/bin/sh/eval.c
Modified: head/bin/sh/eval.c
==============================================================================
--- head/bin/sh/eval.c Thu Jun 16 21:12:36 2011 (r223162)
+++ head/bin/sh/eval.c Thu Jun 16 21:50:28 2011 (r223163)
@@ -140,7 +140,7 @@ evalcmd(int argc, char **argv)
STPUTC('\0', concat);
p = grabstackstr(concat);
}
- evalstring(p, builtin_flags & EV_TESTED);
+ evalstring(p, builtin_flags);
} else
exitstatus = 0;
return exitstatus;
@@ -908,6 +908,7 @@ evalcommand(union node *cmd, int flags,
dup2(pip[1], 1);
close(pip[1]);
}
+ flags &= ~EV_BACKCMD;
}
flags |= EV_EXIT;
}
Added: head/tools/regression/bin/sh/expansion/cmdsubst11.0
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/tools/regression/bin/sh/expansion/cmdsubst11.0 Thu Jun 16 21:50:28
2011 (r223163)
@@ -0,0 +1,5 @@
+# $FreeBSD$
+
+# Not required by POSIX but useful for efficiency.
+
+[ $$ = $(eval '${SH} -c echo\ \$PPID') ]
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