You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
821 B
49 lines
821 B
#include <litc.h>
|
|
|
|
static char buf[5120];
|
|
|
|
void readprint(int fd)
|
|
{
|
|
long ret;
|
|
if ((ret = read(fd, &buf, sizeof(buf))) < 0) {
|
|
err(ret, "read");
|
|
exit(-1);
|
|
}
|
|
printf("FD %d read %ld bytes\n", fd, ret);
|
|
if (ret == sizeof(buf))
|
|
ret = sizeof(buf) - 1;
|
|
buf[ret] = '\0';
|
|
printf("FD %d returned: %s\n", fd, buf);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int pid1 = fork();
|
|
int pid2 = fork();
|
|
|
|
int fd;
|
|
if ((fd = open("/boot/uefi/readme.txt", O_RDWR, 0)) < 0) {
|
|
err(fd, "open");
|
|
return -1;
|
|
}
|
|
|
|
if (pid1 && pid2) {
|
|
int j;
|
|
for (j = 0; j < 100000000; j++)
|
|
asm volatile("":::"memory");
|
|
readprint(fd);
|
|
return 0;
|
|
}
|
|
|
|
int i;
|
|
for (i = 0; i < sizeof(buf); i++)
|
|
buf[i] = 0x41 + (i / 1000);
|
|
|
|
int ret;
|
|
if ((ret = write(fd, buf, sizeof(buf))) != sizeof(buf)) {
|
|
err(ret, "write");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|