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v0.8.1
Revision faaa30392221c7d53d995f65f59f26e86fb84d76 authored by Miss Skeleton (bot) on 03 October 2020, 11:42:16 UTC, committed by Łukasz Langa on 04 October 2020, 15:30:49 UTC 
[3.9] bpo-41867: List options for timespec in docstrings of isoformat methods (GH-22418)
 
(cherry picked from commit 52301312bb9de2299b0c42468fd1936d869e651c)

Co-authored-by: Ram Rachum <ram@rachum.com>
1 parent 5533c49
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;
}
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