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authorUlrich Drepper <drepper@redhat.com>1998-03-17 17:27:52 +0000
committerUlrich Drepper <drepper@redhat.com>1998-03-17 17:27:52 +0000
commit3c20b9b6a527397cf32fb013c86b1e4b5c422dc0 (patch)
tree5feccefeef12e6e036327536b1e086f64e36bc52 /manual/process.texi
parent48fc3dd2248fbfd6cd9e786fec89dffc604ead35 (diff)
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Update.
1998-03-18 00:25 Tim Waugh <tim@cyberelk.demon.co.uk> * posix/wordexp.c (parse_comm): Allow quoting inside $(...). (parse_param): Fold in Andreas' fixes to do with when the end of the parameter name has been reached, and quoting inside ${...}. (parse_dollars): Fix differentiation between $(((1+3)*(4-2))) and $((echo);(ls)). 1998-03-16 22:10 Zack Weinberg <zack@rabi.phys.columbia.edu> * manual/maint.texi: Split out installation and contribution sections to their own appendices. Misc cleanups. * manual/install.texi: New file. Mention add-ons. Refer to FAQ. * manual/contrib.texi: New file. * manual/libc.texinfo: Pull in new appendices. * manual/header.texi: Correct node pointer. 1998-03-17 Andreas Jaeger <aj@arthur.rhein-neckar.de> * manual/process.texi (Process Completion): Clarify return value of waitpid a bit. Patch by Zack Weinberg. [PR libc/490]
Diffstat (limited to 'manual/process.texi')
-rw-r--r--manual/process.texi16
1 files changed, 12 insertions, 4 deletions
diff --git a/manual/process.texi b/manual/process.texi
index 56edf2d24c..71fc707f9a 100644
--- a/manual/process.texi
+++ b/manual/process.texi
@@ -498,10 +498,18 @@ protected using cancelation handlers.
@c ref pthread_cleanup_push / pthread_cleanup_pop
The return value is normally the process ID of the child process whose
-status is reported. If the @code{WNOHANG} option was specified and no
-child process is waiting to be noticed, the value is zero. A value of
-@code{-1} is returned in case of error. The following @code{errno}
-error conditions are defined for this function:
+status is reported. If there are child processes but none of them is
+waiting to be noticed, @code{waitpid} will block until one is. However,
+if the @code{WNOHANG} option was specified, @code{waitpid} will return
+zero instead of blocking.
+
+If a specific PID to wait for was given to @code{waitpid}, it will
+ignore all other children (if any). Therefore if there are children
+waiting to be noticed but the child whose PID was specified is not one
+of them, @code{waitpid} will block or return zero as described above.
+
+A value of @code{-1} is returned in case of error. The following
+@code{errno} error conditions are defined for this function:
@table @code
@item EINTR