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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision d5da7a63c18f545e7cc650709843092b2a57880f authored by Guido van Rossum on 24 November 1997, 23:59:31 UTC, committed by Guido van Rossum on 24 November 1997, 23:59:31 UTC 
Get rid of last traces of module 'audio'
1 parent ca83f01
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Tip revision: d5da7a63c18f545e7cc650709843092b2a57880f authored by Guido van Rossum on 24 November 1997, 23:59:31 UTC
Get rid of last traces of module 'audio'
Tip revision: d5da7a6
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(fd1, fd2)
int fd1, 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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