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Diffstat (limited to 'manual/process.texi')
| -rw-r--r-- | manual/process.texi | 16 |
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 |