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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision c98108241037e88c28c095445c6da74c041fc5b4 authored by Michael W. Hudson on 18 March 2002, 13:10:13 UTC, committed by Michael W. Hudson on 18 March 2002, 13:10:13 UTC 
backport jackjansen's checkin of
 
    revision 1.3 of regen

Patch by Michael Pruett: make regen work on Irix 6.0 and 6.5.
1 parent 1c136f3
Raw File
Tip revision: c98108241037e88c28c095445c6da74c041fc5b4 authored by Michael W. Hudson on 18 March 2002, 13:10:13 UTC
backport jackjansen's checkin of
Tip revision: c981082
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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