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| author | Arnold D. Robbins <arnold@skeeve.com> | 2016-04-02 22:52:11 +0300 |
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| committer | Arnold D. Robbins <arnold@skeeve.com> | 2016-04-04 06:37:44 +0300 |
| commit | b332053a160357e6c30c22f9ca90af9129e4550b (patch) | |
| tree | 95f48921b1ebc8e5ca0c45114bcd8b6bf37efdd9 /doc/gawktexi.in | |
| parent | 464aa113b70b30ab9b1b00d1de5ccf4b0230b720 (diff) | |
| download | egawk-b332053a160357e6c30c22f9ca90af9129e4550b.tar.gz egawk-b332053a160357e6c30c22f9ca90af9129e4550b.tar.bz2 egawk-b332053a160357e6c30c22f9ca90af9129e4550b.zip | |
Document about using closed end of two-way pipes.
Diffstat (limited to 'doc/gawktexi.in')
| -rw-r--r-- | doc/gawktexi.in | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/gawktexi.in b/doc/gawktexi.in index cd240a43..4d2a76f3 100644 --- a/doc/gawktexi.in +++ b/doc/gawktexi.in @@ -26598,6 +26598,11 @@ As a side note, the assignment @samp{LC_ALL=C} in the @command{sort} command ensures traditional Unix (ASCII) sorting from @command{sort}. This is not strictly necessary here, but it's good to know how to do this. +Be careful when closing the @code{"from"} end of a two-way pipe; in this +case @command{gawk} waits for the child process to exit, which may cause +your program to hang. (Thus, this particular feature is of much less +use in practice than being able to close the @code{"to"} end.) + @cindex @command{gawk}, @code{PROCINFO} array in @cindex @code{PROCINFO} array, and communications via ptys You may also use pseudo-ttys (ptys) for |