xv6-cs450/userfs.c

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#include "types.h"
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#include "stat.h"
#include "user.h"
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#include "fs.h"
#include "fcntl.h"
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// file system tests
char buf[2000];
char *echo_args[] = { "echo", "hello", "goodbye", 0 };
char *cat_args[] = { "cat", "README", 0 };
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int
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main(void)
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{
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int fd;
int i;
int stdout = 1;
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printf(stdout, "userfs is running\n");
block();
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fd = open("echo", 0);
if(fd >= 0){
printf(stdout, "open echo ok\n");
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close(fd);
} else {
printf(stdout, "open echo failed!\n");
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}
fd = open("doesnotexist", 0);
if(fd >= 0){
printf(stdout, "open doesnotexist succeeded!\n");
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close(fd);
} else {
printf(stdout, "open doesnotexist failed\n");
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}
fd = open("doesnotexist", O_CREATE|O_RDWR);
if(fd >= 0){
printf(stdout, "creat doesnotexist succeeded\n");
} else {
printf(stdout, "error: creat doesnotexist failed!\n");
}
for (i = 0; i < 100; i++) {
if (write (fd, "aaaaaaaaaa", 10) != 10) {
printf(stdout, "error: write new file failed\n");
}
if (write (fd, "bbbbbbbbbb", 10) != 10) {
printf(stdout, "error: write new file failed\n");
}
}
printf(stdout, "writes done\n");
close(fd);
fd = open("doesnotexist", O_RDONLY);
if(fd >= 0){
printf(stdout, "open doesnotexist succeeded\n");
} else {
printf(stdout, "error: open doesnotexist failed!\n");
}
i = read(fd, buf, 2000);
if (i == 2000) {
printf(stdout, "read succeeded\n");
} else {
printf(stdout, "read failed\n");
}
close(fd);
unlink("doesnotexist");
//exec("echo", echo_args);
printf(stdout, "about to do exec\n");
exec("cat", cat_args);
return 0;
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}