From 7e0f021a9aec35fd8e6725e87e3313b101d26f5e Mon Sep 17 00:00:00 2001 From: Tobias Klauser Date: Sun, 27 Jan 2008 11:37:44 +0100 Subject: Initial import (2.0.2-6) --- reference/C/MAN/dup.htm | 98 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 reference/C/MAN/dup.htm (limited to 'reference/C/MAN/dup.htm') diff --git a/reference/C/MAN/dup.htm b/reference/C/MAN/dup.htm new file mode 100644 index 0000000..4ade0c3 --- /dev/null +++ b/reference/C/MAN/dup.htm @@ -0,0 +1,98 @@ +dup + +
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DUP(2)              Linux Programmer's Manual              DUP(2)
+

+
+
NAME
+
       dup, dup2 - duplicate a file descriptor
+
+
SYNOPSIS
+
       #include <unistd.h>
+
+       int dup(int oldfd);
+       int dup2(int oldfd, int newfd);
+
+
DESCRIPTION
+
       dup and dup2 create a copy of the file descriptor oldfd.
+
+       The  old  and new descriptors may be used interchangeably.
+       They share locks, file position pointers  and  flags;  for
+       example,  if  the file position is modified by using lseek
+       on one of the descriptors, the position  is  also  changed
+       for the other.
+
+       The  two  descriptors do not share the close-on-exec flag,
+       however.
+
+       dup uses the lowest-numbered unused descriptor for the new
+       descriptor.
+
+       dup2 makes newfd be the copy of oldfd, closing newfd first
+       if necessary.
+
+
RETURN VALUE
+
       dup and dup2 return the new descriptor, or -1 if an  error
+       occurred (in which case, errno is set appropriately).
+
+
ERRORS
+
       EBADF  oldfd  isn't  an  open file descriptor, or newfd is
+              out of the allowed range for file descriptors.
+
+       EMFILE The process already has the maximum number of  file
+              descriptors open and tried to open a new one.
+
+
WARNING
+
       The  error  returned by dup2 is different to that returned
+       by fcntl(...,F_DUPFD,...)  when newfd is out of range.  On
+       some  systems  dup2  also  sometimes  returns  EINVAL like
+       F_DUPFD.
+
+
CONFORMING TO
+
       SVID, AT&T, POSIX, X/OPEN, BSD 4.3
+
+
+
+

SEE ALSO +

+fcntl, +open, +

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+
Linux 1.1.46              21 August 1994                        1
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