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37 lines
1.2 KiB
37 lines
1.2 KiB
9 years ago
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When writing to a closed pipe, which happens with simple
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seq 99999 | grep -v xxx | head -1
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the write() function will return an EPIPE error. The kernel also sends
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SIGPIPE to the process, which by default kills it.
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As the signal delivery is not immediate, grep may see EPIPE and report
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it as an error, which is annoying, especially on Android where this
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timing issue is encountered a lot more.
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See http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23267 where it has
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been suggested to silently ignore EPIPE. That was in the context of
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SIGPIPE being ignored, but this should probably also been done to
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avoid timing issues. Feedback has been sent to the above issue and
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is awaiting mailing list approval.
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diff -u -r ../grep-2.25/src/grep.c ./src/grep.c
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--- ../grep-2.25/src/grep.c 2016-04-02 20:45:51.000000000 -0400
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+++ ./src/grep.c 2016-04-23 06:41:54.419351897 -0400
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@@ -1234,8 +1234,13 @@
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if (line_buffered)
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fflush_errno ();
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- if (stdout_errno)
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- error (EXIT_TROUBLE, stdout_errno, _("write error"));
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+ if (stdout_errno) {
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+ if (stdout_errno == EPIPE) {
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+ exit (EXIT_SUCCESS);
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+ } else {
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+ error (EXIT_TROUBLE, stdout_errno, _("write error"));
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+ }
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+ }
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lastout = lim;
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}
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