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Annotated edit history of dup(2) version 3 showing authors affecting page license. View with all changes included.
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1 perry 1 !!NAME
2
3 dup, dup2 - duplicate a file descriptor
4 !!SYNOPSIS
5
6
2 PerryLorier 7 __#include <unistd.h>__
8 __int dup(int__ ''oldfd''__);__
1 perry 9
10 !!DESCRIPTION
11
2 PerryLorier 12 __dup__ create a copy of the file descriptor ''oldfd''.
1 perry 13
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2 PerryLorier 15 After successful return of __dup__, 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(2) on one of the descriptors, the position is also changed for the other.
1 perry 16
2 PerryLorier 17 The two descriptors do __not__ share the close-on-exec flag, however.
1 perry 18
2 PerryLorier 19 dup(2) uses the lowest-numbered unused descriptor for the new descriptor.
1 perry 20
21 !!RETURN VALUE
22
2 PerryLorier 23 __dup__ returns the new descriptor, or -1 if an error occurred (in which case, ''errno'' is set appropriately).
1 perry 24
25 !!ERRORS
26
2 PerryLorier 27 ;[EBADF]: ''oldfd'' isn't an open file descriptor
28 ;[EMFILE]: The process already has the maximum number of file descriptors open and tried to open a new one.
1 perry 29
30 !!CONFORMING TO
31
2 PerryLorier 32 SVr4, SVID, POSIX, X/OPEN, BSD 4.3. SVr4 documents additional [EINTR] and [ENOLINK] error conditions. POSIX.1 adds [EINTR].
1 perry 33
34 !!SEE ALSO
35
2 PerryLorier 36 fcntl(2), open(2), close(2)
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