#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#define BUF1_LEN 0x2000
#define BUF2_LEN 0x3000
#define BUF3_LEN (BUF1_LEN + BUF2_LEN)
int main(int argc, char *argv[])
{
int fd;
static char buf1[BUF1_LEN], buf2[BUF2_LEN], buf3[BUF3_LEN];
fd = open("/proc/kcore", O_RDONLY);
if (fd == -1) {
fprintf(stderr, "open(), errno=%d (%s)\n", errno, strerror(errno));
exit(1);
}
if (read(fd, buf1, BUF1_LEN) != BUF1_LEN) {
fprintf(stderr, "read(buf1, BUF1_LEN),
errno=%d (%s)\n", errno, strerror(errno));
exit(1);
}
if (read(fd, buf2, BUF2_LEN) != BUF2_LEN) {
fprintf(stderr, "read(buf2, BUF2_LEN),
errno=%d (%s)\n", errno, strerror(errno));
exit(1);
}
if (lseek(fd, 0, SEEK_SET) == -1) {
fprintf(stderr, "lseek(0),
errno=%d (%s)\n", errno, strerror(errno));
exit(1);
}
if (read(fd, buf3, BUF3_LEN) != BUF3_LEN) {
fprintf(stderr, "read(buf3, BUF3_LEN),
errno=%d (%s)\n", errno, strerror(errno));
exit(1);
}
if (memcmp(buf3, buf1, BUF1_LEN) != 0)
fprintf(stderr, "Error: buf3 != buf1\n");
if (memcmp(buf3+BUF1_LEN, buf2, BUF2_LEN) != 0)
fprintf(stderr, "Error: buf3+BUF1_LEN != buf2\n");
(void)close(fd);
return 0;
}
