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Man Pages


Manual Reference Pages  -  DUP3 (3)

NAME

dup3 - duplicate an existing file descriptor

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
Standards
History

LIBRARY


.Lb libc

SYNOPSIS


.In fcntl.h
.In unistd.h int dup3 int oldd int newd int flags

DESCRIPTION

The dup3 function duplicates an existing object descriptor while allowing the value of the new descriptor to be specified.

The close-on-exec flag on the new file descriptor is determined by the O_CLOEXEC bit in flags.

If oldd != newd and flags == 0, the behavior is identical to dup2(oldd, newd).

If oldd == newd, then dup3 fails, unlike dup2(2).

RETURN VALUES

The value -1 is returned if an error occurs. The external variable errno indicates the cause of the error.

ERRORS

The dup3 function fails if:
[EBADF]
  The oldd argument is not a valid active descriptor or the newd argument is negative or exceeds the maximum allowable descriptor number
[EINVAL]
  The oldd argument is equal to the newd argument.
[EINVAL]
  The flags argument has bits set other than O_CLOEXEC.

SEE ALSO

accept(2), close(2), dup2(2), fcntl(2), getdtablesize(2), open(2), pipe(2), socket(2), socketpair(2)

STANDARDS

The dup3 function does not conform to any standard.

HISTORY

The dup3 function appeared in
.Fx 10.0 .
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