Skip to main content

Browse the archive

Staging
v0.8.1
Revision 3271fba16e862c239a0aa391e49ea1d7b19d5924 authored by Miss Islington (bot) on 07 July 2018, 19:34:43 UTC, committed by GitHub on 07 July 2018, 19:34:43 UTC 
Add missing closing parentheses (GH-8144)
 
(cherry picked from commit 03dd0e794e26afb5fa998d10ae2071e2cb0bc634)

Co-authored-by: Andrés Delfino <adelfino@gmail.com>
1 parent dc33d4a
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;
}
back to top