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System Calls dup(2)
NAME
dup - duplicate an open file descriptor
SYNOPSIS
#include <unistd.h>
int dup(int fildes);
DESCRIPTION
The dup() function returns a new file descriptor having the
following in common with the original open file descriptor
fildes:
o same open file (or pipe)
o same file pointer (that is, both file descriptors share
one file pointer)
o same access mode (read, write or read/write).
The new file descriptor is set to remain open across exec
functions (see fcntl(2)).
The file descriptor returned is the lowest one available.
The dup(fildes) function call is equivalent to:
fcntl(fildes, F_DUPFD, 0)
RETURN VALUES
Upon successful completion, a non-negative integer
representing the file descriptor is returned. Otherwise, -1
is returned and errno is set to indicate the error.
ERRORS
The dup() function will fail if:
EBADF The fildes argument is not a valid open file
descriptor.
EINTR A signal was caught during the execution of
the dup() function.
EMFILE The process has too many open files (see
getrlimit(2)).
SunOS 5.10 Last change: 28 Dec 1996 1
System Calls dup(2)
ENOLINK The fildes argument is on a remote machine
and the link to that machine is no longer
active.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
| MT-Level | Async-Signal-Safe |
|_____________________________|_____________________________|
SEE ALSO
close(2), creat(2), exec(2), fcntl(2), getrlimit(2),
open(2), pipe(2), dup2(3C), lockf(3C), attributes(5), stan-
dards(5)
SunOS 5.10 Last change: 28 Dec 1996 2
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Wed Sep 12 21:37:21 GMT 2007
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