diff options
Diffstat (limited to 'lib/libc/sys/select.2')
| -rw-r--r-- | lib/libc/sys/select.2 | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/lib/libc/sys/select.2 b/lib/libc/sys/select.2 index bacd76e..193c903 100644 --- a/lib/libc/sys/select.2 +++ b/lib/libc/sys/select.2 @@ -108,25 +108,33 @@ to the maximum number of descriptors supported by the system. .Pp If .Fa timeout -is a non-nil pointer, it specifies the maximum interval to wait for the +is not a +.Dv NULL +pointer, it specifies the maximum interval to wait for the selection to complete. System activity can lengthen the interval by an indeterminate amount. .Pp If .Fa timeout -is a nil pointer, the select blocks indefinitely. +is a +.Dv NULL +pointer, the select blocks indefinitely. .Pp To effect a poll, the .Fa timeout -argument should be non-nil, pointing to a zero-valued timeval structure. +argument should not be +.Dv NULL , +but it should point to a zero-valued timeval structure. .Pp Any of .Fa readfds , .Fa writefds , and .Fa exceptfds -may be given as nil pointers if no descriptors are of interest. +may be given as +.Dv NULL +pointers if no descriptors are of interest. .Sh RETURN VALUES The .Fn select |
