Attachment 52758 Details for Bug 79887 – dup2.c

dup2.c

dup2.c (text/x-csrc; charset=us-ascii), 1.21 KB, created by Vasil Dimov on 2010-12-07 09:52:00 UTC

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Creator: Vasil Dimov

Created: 2010-12-07 09:52:00 UTC

Size: 1.21 KB

patch

obsolete

>#include <sys/types.h>
>#include <sys/uio.h>
>
>#include <fcntl.h>
>#include <stdio.h>
>#include <unistd.h>
>
>int
>main(int argc, char **argv)
>{
>	int	fd1;
>	int	fd1_orig;
>	int	fd_other;
>	int	ret;
>
>	fd1 = open("/tmp/f1", O_RDWR | O_CREAT, 0644);
>	printf("open(): /tmp/f1: %d\n", fd1);
>
>	printf("trx1: freopen() begins, will associate fd=%d with /tmp/f2\n",
>	       fd1);
>
>	fd1_orig = fd1;
>
>	fd1 = open("/tmp/f2", O_RDWR | O_CREAT, 0644);
>	printf("trx1: freopen(): open(): /tmp/f2: %d\n", fd1);
>
>	ret = close(fd1_orig);
>	printf("trx1: freopen(): close(): %d: %d\n", fd1_orig, ret);
>
>	/* another thread executes in the meantime, opening some file */
>	fd_other = open("/tmp/f_other", O_RDWR | O_CREAT, 0644);
>	printf("trx2: open(): /tmp/f_other: %d\n", fd_other);
>	/* end of another thread, freopen() continues */
>
>	ret = dup2(fd1, fd1_orig);
>	printf("trx1: freopen(): dup2(): %d,%d: %d\n", fd1, fd1_orig, ret);
>	fd1 = fd1_orig;
>
>	printf("trx1: freopen(): end, now fd=%d is associated with /tmp/f2\n",
>	       fd1);
>
>	printf("trx1: write to fd=%d (supposed to be /tmp/f2)\n", fd1);
>	write(fd1, "ABC", 3);
>
>	printf("trx2: write to fd=%d (supposed to be /tmp/f_other)\n", fd_other);
>	write(fd_other, "XYZ", 3);
>
>	close(fd1);
>	close(fd_other);
>
>	return(0);
>}

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Attachments on bug 79887: 52756 | 52757 | 52758