diff options
Diffstat (limited to 'lib/libc/sys/pipe.2')
| -rw-r--r-- | lib/libc/sys/pipe.2 | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/lib/libc/sys/pipe.2 b/lib/libc/sys/pipe.2 index 92d137f..bb3db51 100644 --- a/lib/libc/sys/pipe.2 +++ b/lib/libc/sys/pipe.2 @@ -28,7 +28,7 @@ .\" @(#)pipe.2 8.1 (Berkeley) 6/4/93 .\" $FreeBSD$ .\" -.Dd January 30, 2006 +.Dd March 31, 2013 .Dt PIPE 2 .Os .Sh NAME @@ -40,6 +40,8 @@ .In unistd.h .Ft int .Fn pipe "int fildes[2]" +.Ft int +.Fn pipe2 "int fildes[2]" "int flags" .Sh DESCRIPTION The .Fn pipe @@ -50,6 +52,29 @@ which is an object allowing bidirectional data flow, and allocates a pair of file descriptors. .Pp +The +.Fn pipe2 +system call allows control over the attributes of the file descriptors +via the +.Fa flags +argument. +Values for +.Fa flags +are constructed by a bitwise-inclusive OR of flags from the following +list, defined in +.In fcntl.h : +.Bl -tag -width ".Dv O_NONBLOCK" +.It Dv O_CLOEXEC +Set the close-on-exec flag for the new file descriptors. +.It Dv O_NONBLOCK +Set the non-blocking flag for the ends of the pipe. +.El +.Pp +If the +.Fa flags +argument is 0, the behavior is identical to a call to +.Fn pipe . +.Pp By convention, the first descriptor is normally used as the .Em read end of the pipe, @@ -88,7 +113,9 @@ pipe in one direction. .Sh ERRORS The .Fn pipe -system call will fail if: +and +.Fn pipe2 +system calls will fail if: .Bl -tag -width Er .It Bq Er EMFILE Too many descriptors are active. @@ -97,6 +124,16 @@ The system file table is full. .It Bq Er ENOMEM Not enough kernel memory to establish a pipe. .El +.Pp +The +.Fn pipe2 +system call will also fail if: +.Bl -tag -width Er +.It Bq Er EINVAL +The +.Fa flags +argument is invalid. +.El .Sh SEE ALSO .Xr sh 1 , .Xr fork 2 , @@ -111,3 +148,8 @@ function appeared in .Pp Bidirectional pipes were first used on .At V.4 . +.Pp +The +.Fn pipe2 +function appeared in +.Fx 10.0 . |
