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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision afa4140d9c50b9136b157f6792329d3e5e9dac0a authored by Benjamin Peterson on 24 February 2010, 02:26:59 UTC, committed by Benjamin Peterson on 24 February 2010, 02:26:59 UTC 
Merged revisions 78408 via svnmerge from
 
svn+ssh://pythondev@svn.python.org/python/trunk

................
  r78408 | benjamin.peterson | 2010-02-23 20:24:35 -0600 (Tue, 23 Feb 2010) | 9 lines

  Merged revisions 78407 via svnmerge from
  svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3

  ........
    r78407 | benjamin.peterson | 2010-02-23 20:21:34 -0600 (Tue, 23 Feb 2010) | 1 line

    rewrite test to not rely on __doc__ being present
  ........
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Tip revision: afa4140d9c50b9136b157f6792329d3e5e9dac0a authored by Benjamin Peterson on 24 February 2010, 02:26:59 UTC
Merged revisions 78408 via svnmerge from
Tip revision: afa4140
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>

#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;
}
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