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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 3921d12174c1998d9df7a08d036a7fef2d587a64 authored by Miss Islington (bot) on 23 August 2019, 19:04:27 UTC, committed by GitHub on 23 August 2019, 19:04:27 UTC 
bpo-37549: os.dup() fails for standard streams on Windows 7 (GH-15389)
 
(cherry picked from commit 5be666010e4df65dc4d831435cc92340ea369f94)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
1 parent 761e5a7
Raw File
Tip revision: 3921d12174c1998d9df7a08d036a7fef2d587a64 authored by Miss Islington (bot) on 23 August 2019, 19:04:27 UTC
bpo-37549: os.dup() fails for standard streams on Windows 7 (GH-15389)
Tip revision: 3921d12
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;
}
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