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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision ecc66d848e4700f51ab645fcff870c3c53dcbabd authored by Mark Dickinson on 16 September 2009, 22:13:31 UTC, committed by Mark Dickinson on 16 September 2009, 22:13:31 UTC 
Blocked revisions 74853 via svnmerge
 
........
  r74853 | mark.dickinson | 2009-09-16 23:10:56 +0100 (Wed, 16 Sep 2009) | 5 lines

  Issue #6713:  Improve performance of str(n) and repr(n) for integers n
  (up to 3.1 times faster in tests), by special-casing base 10 in
  _PyLong_Format.  (Backport of r74851 from py3k.)
........
1 parent 1170b99
Raw File
Tip revision: ecc66d848e4700f51ab645fcff870c3c53dcbabd authored by Mark Dickinson on 16 September 2009, 22:13:31 UTC
Blocked revisions 74853 via svnmerge
Tip revision: ecc66d8
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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