mirror of
https://github.com/drasko/codezero.git
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f561d885d5
serving mm0, if it page faults, system deadlocks because mm0 is waiting to be served by vfs. FIX: To fix this, mm0 will need to fork itself and keep a separate thread solely for page fault handling.
133 lines
2.3 KiB
C
133 lines
2.3 KiB
C
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <tests.h>
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int fileio2(void)
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{
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int fd;
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ssize_t cnt;
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int err;
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char buf[128];
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off_t offset;
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char *str = "I WROTE TO THIS FILE\n";
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if ((fd = open("/home/bahadir/newfile2.txt", O_RDWR | O_CREAT | O_TRUNC, S_IRWXU)) < 0) {
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perror("OPEN");
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return -1;
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}
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printf("Created newfile2.txt\n");
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printf("%s: write.\n", __TASKNAME__);
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if ((int)(cnt = write(fd, str, strlen(str))) < 0) {
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perror("WRITE");
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return -1;
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}
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printf("%s: close.\n", __TASKNAME__);
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if ((err = close(fd)) < 0) {
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printf("Close failed.\n");
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perror("CLOSE");
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return -1;
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}
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printf("%s: re-open.\n", __TASKNAME__);
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if ((fd = open("/home/bahadir/newfile2.txt", O_RDWR, S_IRWXU)) < 0) {
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perror("OPEN");
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return -1;
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}
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printf("%s: lseek.\n", __TASKNAME__);
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if ((int)(offset = lseek(fd, 0, SEEK_SET)) < 0) {
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perror("LSEEK");
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return -1;
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}
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printf("%s: read.\n", __TASKNAME__);
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if ((int)(cnt = read(fd, buf, strlen(str))) < 0) {
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perror("READ");
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return -1;
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}
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printf("Read: %d bytes from file.\n", cnt);
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if (cnt) {
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printf("Read string: %s\n", buf);
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}
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if ((err = close(fd)) < 0) {
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perror("CLOSE");
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return -1;
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}
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return 0;
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}
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int fileio(void)
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{
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int fd;
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ssize_t cnt;
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int err;
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char buf[128];
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off_t offset;
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char *str = "I WROTE TO THIS FILE\n";
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if ((fd = open("/home/bahadir/newfile.txt", O_RDWR | O_CREAT | O_TRUNC, S_IRWXU)) < 0) {
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perror("OPEN");
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return -1;
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}
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printf("Created newfile.txt\n");
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printf("%s: write.\n", __TASKNAME__);
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if ((int)(cnt = write(fd, str, strlen(str))) < 0) {
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perror("WRITE");
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return -1;
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}
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printf("%s: lseek.\n", __TASKNAME__);
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if ((int)(offset = lseek(fd, 0, SEEK_SET)) < 0) {
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perror("LSEEK");
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return -1;
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}
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printf("%s: read.\n", __TASKNAME__);
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if ((int)(cnt = read(fd, buf, strlen(str))) < 0) {
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perror("READ");
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return -1;
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}
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printf("Read: %d bytes from file.\n", cnt);
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if (cnt) {
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printf("Read string: %s\n", buf);
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}
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if ((err = close(fd)) < 0) {
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perror("CLOSE");
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return -1;
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}
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return 0;
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}
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#if defined(HOST_TESTS)
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int main(void)
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{
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printf("File IO test 1:\n");
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if (fileio() == 0)
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printf("-- PASSED --\n");
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else
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printf("-- FAILED --\n");
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printf("File IO test 2:\n");
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if (fileio2() == 0)
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printf("-- PASSED --\n");
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else
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printf("-- FAILED --\n");
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return 0;
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}
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#endif
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