diff options
Diffstat (limited to 'lib/libc/sys/select.2')
| -rw-r--r-- | lib/libc/sys/select.2 | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/lib/libc/sys/select.2 b/lib/libc/sys/select.2 index b3addb7317d0..871d68d9c1bf 100644 --- a/lib/libc/sys/select.2 +++ b/lib/libc/sys/select.2 @@ -49,7 +49,9 @@ .Fn FD_ISSET fd &fdset .Fn FD_ZERO &fdset .Sh DESCRIPTION -.Fn Select +The +.Fn select +system call examines the I/O descriptor sets whose addresses are passed in .Fa readfds , .Fa writefds , @@ -71,7 +73,9 @@ On return, replaces the given descriptor sets with subsets consisting of those descriptors that are ready for the requested operation. -.Fn Select +The +.Fn select +system call returns the total number of ready descriptors in all the sets. .Pp The descriptor sets are stored as bit fields in arrays of integers. @@ -123,7 +127,9 @@ and .Fa exceptfds may be given as nil pointers if no descriptors are of interest. .Sh RETURN VALUES -.Fn Select +The +.Fn select +system call returns the number of ready descriptors that are contained in the descriptor sets, or -1 if an error occurred. @@ -133,7 +139,7 @@ returns 0. If .Fn select returns with an error, -including one due to an interrupted call, +including one due to an interrupted system call, the descriptor sets will be unmodified. .Sh ERRORS An error return from @@ -189,11 +195,11 @@ allows systems to modify the original timeout in place. Thus, it is unwise to assume that the timeout value will be unmodified by the .Fn select -call. +system call. .Sh STANDARDS The .Fn select -function and +system call and .Fn FD_CLR , .Fn FD_ISSET , .Fn FD_SET , @@ -204,5 +210,5 @@ macros conform with .Sh HISTORY The .Fn select -function call appeared in +system call appeared in .Bx 4.2 . |