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v0.8.1
Revision eebd0173b6b7e8aeacbfcae6bb28dcdc8907e33f authored by Martin v. Löwis on 14 November 2010, 18:17:39 UTC, committed by Martin v. Löwis on 14 November 2010, 18:17:39 UTC 
Merged revisions 84487 via svnmerge from
 
svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r84487 | martin.v.loewis | 2010-09-04 16:38:09 +0200 (Sa, 04 Sep 2010) | 3 lines

  Issue #1303434: Include PDBs in release.
  Patch by James Lee and Daniel Stutzbach.
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1 parent 501bfd8
Raw File
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;
}
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