diff options
Diffstat (limited to 'lib/libc/sys/dup.2')
| -rw-r--r-- | lib/libc/sys/dup.2 | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/lib/libc/sys/dup.2 b/lib/libc/sys/dup.2 index c87b386..d2a4b7e 100644 --- a/lib/libc/sys/dup.2 +++ b/lib/libc/sys/dup.2 @@ -28,7 +28,7 @@ .\" @(#)dup.2 8.1 (Berkeley) 6/4/93 .\" $FreeBSD$ .\" -.Dd June 4, 1993 +.Dd August 14, 2011 .Dt DUP 2 .Os .Sh NAME @@ -115,6 +115,11 @@ and is a valid descriptor, then .Fn dup2 is successful, and does nothing. +.Pp +The related +.Xr cap_new 2 +system call allows file descriptors to be duplicated with restrictions on +their use. .Sh RETURN VALUES The value -1 is returned if an error occurs in either call. The external variable @@ -123,22 +128,30 @@ indicates the cause of the error. .Sh ERRORS The .Fn dup -and -.Fn dup2 -system calls fail if: +system call fails if: .Bl -tag -width Er .It Bq Er EBADF The .Fa oldd -or -.Fa newd argument is not a valid active descriptor .It Bq Er EMFILE Too many descriptors are active. .El +The +.Fn dup2 +system call fails if: +.Bl -tag -width Er +.It Bq Er EBADF +The +.Fa oldd +argument is not a valid active descriptor or the +.Fa newd +argument is negative or exceeds the maximum allowable descriptor number +.El .Sh SEE ALSO .Xr accept 2 , +.Xr cap_new 2 , .Xr close 2 , .Xr fcntl 2 , .Xr getdtablesize 2 , |
