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dup(2): Clarify return value, in particular of dup2().

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This commit is contained in:
Jilles Tjoelker 2013-05-31 22:09:31 +00:00
parent 1f4e9654bd
commit 4b08438c22
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251203
1 changed files with 5 additions and 4 deletions
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9
lib/libc/sys/dup.2
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@ -28,7 +28,7 @@
.\" @(#)dup.2 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd April 21, 2013
.Dd June 1, 2013
.Dt DUP 2
.Os
.Sh NAME
@ -113,10 +113,11 @@ is a valid descriptor, then
.Fn dup2
is successful, and does nothing.
.Sh RETURN VALUES
The value -1 is returned if an error occurs in either call.
The external variable
These calls return the new file descriptor if successful;
otherwise the value -1 is returned and
the external variable
.Va errno
indicates the cause of the error.
is set to indicate the cause of the error.
.Sh ERRORS
The
.Fn dup