Skip to main content

Browse the archive

Staging
v0.8.1
Revision 471d2b9ce071947ea1d6b61618518cbeb9227348 authored by Miss Islington (bot) on 20 February 2020, 18:31:11 UTC, committed by GitHub on 20 February 2020, 18:31:11 UTC 
Update runall.bat to the latest Windows build system. (GH-18571) (#18573)
 
(cherry picked from commit 9b833e00e447a3b8b6966686bff701f549c66263)

Co-authored-by: Stefan Krah <skrah@bytereef.org>

Co-authored-by: Stefan Krah <skrah@bytereef.org>
1 parent 44c6901
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