Attachment 247804 Details for Bug 276045 – Test for this trncation bug

Test for this trncation bug

copytest.c (text/plain), 1.33 KB, created by Rick Macklem on 2024-01-20 22:01:56 UTC

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Creator: Rick Macklem

Created: 2024-01-20 22:01:56 UTC

Size: 1.33 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <fcntl.h>
>#include <errno.h>
>#include <sys/param.h>
>#include <sys/types.h>
>#include <sys/stat.h>
>#include <err.h>
>#include <unistd.h>
>
>int
>main(int argc, char *argv[])
>{
>	int i, infd, outfd;
>	ssize_t siz, copyret;
>	char buf[10240];
>	struct stat sb;
>
>	if (argc != 3)
>		errx(1, "Usage: copytest <infile> <outfile>");
>	infd = open(argv[1], O_RDWR | O_CREAT | O_TRUNC, 0644);
>	if (infd < 0)
>		err(1, "can't open %s", argv[1]);
>	outfd = open(argv[2], O_RDWR | O_CREAT | O_TRUNC, 0644);
>	if (outfd < 0)
>		err(1, "can't open %s", argv[2]);
>
>	/* Write to infd and outfd, making outfd the larger file. */
>	for (i = 0; i < 1024; i++)
>		buf[i] = 'A';
>	siz = write(infd, buf, 1024);
>	if (siz != 1024)
>		err(1, "Cannot write %s", argv[1]);
>	for (i = 0; i < 10240; i++)
>		buf[i] = 'B';
>	siz = write(outfd, buf, 10240);
>	if (siz != 10240)
>		err(1, "Cannot write %s", argv[2]);
>
>	if (lseek(infd, 0, SEEK_SET) < 0)
>		err(1, "Cannot lseek %s", argv[1]);
>	if (lseek(outfd, 0, SEEK_SET) < 0)
>		err(1, "Cannot lseek %s", argv[2]);
>	siz = SSIZE_MAX;
>	/* Now, copy infd to outfd. */
>	do {
>		copyret = copy_file_range(infd, NULL, outfd, NULL,
>		    siz, 0);
>	} while (copyret > 0);
>
>	if (fstat(outfd, &sb) < 0)
>		err(1, "Cannot stat %s", argv[2]);
>	if (sb.st_size != 10240)
>		errx(1, "File %s size changed", argv[2]);
>}

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Attachments on bug 276045: 247381 | 247804 | 247805