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- HEAD
- refs/heads/3.10
- refs/heads/3.11
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- refs/heads/main
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Tip revision: 3d5d3f7af6498effbc60a3db1d2b5f41ae6c0a75 authored by Thomas Wouters on 10 January 2023, 12:07:54 UTC
Python 3.12.0a4
Python 3.12.0a4
Tip revision: 3d5d3f7
dup2.c
/*
* Public domain dup2() lookalike
* by Curtis Jackson @ AT&T Technologies, Burlington, NC
* electronic address: burl!rcj
*
* dup2 performs the following functions:
*
* Check to make sure that fd1 is a valid open file descriptor.
* Check to see if fd2 is already open; if so, close it.
* Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd.
* Return fd2 if all went well; return BADEXIT otherwise.
*/
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#define BADEXIT -1
int
dup2(int fd1, int fd2)
{
if (fd1 != fd2) {
#ifdef F_DUPFD
if (fcntl(fd1, F_GETFL) < 0)
return BADEXIT;
if (fcntl(fd2, F_GETFL) >= 0)
close(fd2);
if (fcntl(fd1, F_DUPFD, fd2) < 0)
return BADEXIT;
#else
errno = ENOTSUP;
return BADEXIT;
#endif
}
return fd2;
}