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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision d08417182f7045b53c467934dbd36a51f39e7d5b authored by Ronald Oussoren on 29 September 2009, 13:01:59 UTC, committed by Ronald Oussoren on 29 September 2009, 13:01:59 UTC 
Merged revisions 75131 via svnmerge from
 
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r75131 | ronald.oussoren | 2009-09-29 15:00:44 +0200 (Tue, 29 Sep 2009) | 8 lines

  * Update the Mac/README file. Add the list of OSX-specific configure options
    to that README file with some explanation.

  * Be more strict in the configure script: complain loudly when the user has
    specified invalid combinations of OSX-specific configure arguments.

    The error message refers to the Mac/README file for more information.
........
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Tip revision: d08417182f7045b53c467934dbd36a51f39e7d5b authored by Ronald Oussoren on 29 September 2009, 13:01:59 UTC
Merged revisions 75131 via svnmerge from
Tip revision: d084171
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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