Copyright 1989 AT&T Copyright (c) 1997, Sun Microsystems, Inc. All Rights Reserved
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#include <unistd.h> int dup(int fildes);
The dup() function returns a new file descriptor having the following in common with the original open file descriptor fildes:
same open file (or pipe)
same file pointer (that is, both file descriptors share one file pointer)
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)
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.
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)).
ENOLINK
The fildes argument is on a remote machine and the link to that machine is no longer active.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
| MT-Level | Async-Signal-Safe |
close(2), creat(2), exec(2), fcntl(2), getrlimit(2), open(2), pipe(2), dup2(3C), lockf(3C), attributes(5), standards(5)