Attachment 152589 Details for Bug 236430 – breaknfs testcase

breaknfs testcase

breaknfs.c (text/plain), 1.55 KB, created by IBM Bug Proxy on 2007-04-13 20:54:10 UTC

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Creator: IBM Bug Proxy

Created: 2007-04-13 20:54:10 UTC

Size: 1.55 KB

patch

obsolete

>// Program: breaknfs.c
>//
>// Compile: cc breaknfs.c -o breaknfs
>// Run: ./breaknfs 100 [<nfs-mounted-dir>]
>//
>// Args: arg1 = # of copies of program to run simultaneously
>// arg2 = A directory that is on an NFS-mounted filesystem
>
>#define NFS_MOUNT "/var/nfs"
>
>#include <stdio.h>
>#include <stdlib.h>
>#include <errno.h>
>#include <unistd.h>
>#include <fcntl.h>
>
>#define BUFFER_SIZE (1*1024*1024)
>static char buffer[BUFFER_SIZE];
>
>int main(int argc, char *argv[])
>{
>	char* nfs_dir;
>	int count;
>	int fd;
>	int i;
>	int pid;
>
>	char *files[] = {"file1", "file2", "file3", "file4", "file5"};
>
>	if (argc > 1)
>		count = atoi(argv[1]);
>	else
>		count = 1;
>	if (argc > 2)
>		nfs_dir = argv[2];
>	else
>		nfs_dir = NFS_MOUNT;
>
>	/* cd -> ... */
>	if (chdir(nfs_dir) < 0) {
>		perror(nfs_dir);
>		exit(1);
>	}
>
>	/* Fill buffer with numbers and letters, etc! */
>	for ( i = 0; i < BUFFER_SIZE; i++ ) {
>		buffer[i] = '0' + (i & 0x3f);
>		if ( i && ((i % 80) == 0) )
>			buffer[i] = '\n';
>	}
>
>	/* fork count-1 children */
>	while (count-- > 1) {
>		pid = fork();
>		if (pid == 0) {
>			/* child */
>			break;
>		} else if (pid < 0) {
>			perror("fork");
>			exit(1);
>		}
>	}
>	srandom(getpid());
>
>	/* Forever and a day ... */
>	while(1) {
>	  for (i = 0; i < 5; i++) {
>		int write_size;
>
>		/* Write a random amount of bytes, truncating file before output */
>		write_size = (random() % BUFFER_SIZE) + 1;
>		fd = open(files[i], O_WRONLY | O_CREAT | O_TRUNC, 0600);
>		if (fd < 0) {
>			perror("open");
>			exit(1);
>		}
>		if (write(fd, buffer, write_size) < 0) {
>			perror("write");
>			exit(1);
>		}
>		close(fd);
>	  }
>	}
>
>	return 0;
>}
>

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