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- #define SectorSize 512
- #define TMULT 50
- #define FSIZE ((SectorSize + 1) * TMULT)
- #define FNAME "f-testfile"
- #define READCHAR 'r'
- #define WRITECHAR 'w'
- #include <stdio.h>
- #include <unistd.h>
- #include <err.h>
- #include "f_hdr.h"
- static char buffer[SectorSize + 1];
- static
- void
- check_buffer(void)
- {
- int i;
- char ch = buffer[0];
- for (i = 1; i < SectorSize + 1; i++) {
- if (buffer[i] != ch) {
- errx(1, "Read error: %s", buffer);
- }
- }
-
- putchar(ch);
- }
- void
- subproc_read(void)
- {
- int fd;
- int i, res;
-
- printf("File Reader starting ...\n\n");
- fd = open(FNAME, O_RDONLY);
- if (fd < 0) {
- err(1, "%s: open", FNAME);
- }
- for (i=0; i<TMULT; i++) {
- res = read(fd, buffer, SectorSize + 1);
- if (res < 0) {
- err(1, "%s: read", FNAME);
- }
-
- if (res != SectorSize + 1) {
- errx(1, "%s: read: short count", FNAME);
- }
- check_buffer();
- }
- close(fd);
- printf("File Read exited successfully!\n");
- }
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