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- HEAD
- refs/heads/3.10
- refs/heads/3.6
- refs/heads/3.7
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- refs/heads/3.9
- refs/heads/bpo-45514/deprecate-importlib-resources-legacy
- refs/heads/buildbot-custom
- refs/heads/main
- refs/heads/revert-29124-bpo-44019
- refs/tags/v0.9.8
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Tip revision: 33b2d786e704b1e929fef8aeab9ab840ce840a07 authored by Benjamin Peterson on 03 December 2016, 20:38:47 UTC
python 2.7.13rc1
python 2.7.13rc1
Tip revision: 33b2d78
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 <fcntl.h>
#include <unistd.h>
#define BADEXIT -1
int
dup2(int fd1, int fd2)
{
if (fd1 != fd2) {
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;
}
return fd2;
}