Staging
v0.8.1
v0.8.1
Revision b9172b9630eeefc6dea1409b5bf4180b27fc359f authored by Miss Islington (bot) on 28 March 2018, 08:49:24 UTC, committed by Ned Deily on 28 March 2018, 08:49:24 UTC
(cherry picked from commit c0518cde7a8404f310cd3495e77e612820ecad4f) Co-authored-by: Ned Deily <nad@python.org>
1 parent 39c0ef5
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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