47 lines
771 B
C
47 lines
771 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <errno.h>
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int
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main(int argc, char **argv)
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{
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int fd;
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void *p;
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long l;
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pid_t pid;
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pid = fork();
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if (pid == 0) {
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sleep(1);
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kill(getppid(), SIGKILL);
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exit(0);
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}
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fd = open("rpf.data", O_RDONLY);
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if (fd == -1) {
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perror("open(rpf.data)");
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exit(1);
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}
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p = mmap(NULL, 512*1024*1024, PROT_READ, MAP_PRIVATE, fd, 0);
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if (p == (void *)-1) {
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perror("mmap");
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exit(1);
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}
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close(fd);
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fd = open("rpf.out", O_WRONLY|O_CREAT|O_TRUNC, 0600);
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if (fd == -1) {
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perror("open(fpt.out)");
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exit(1);
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}
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l = write(fd, p, 512*1024*1024);
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printf("write=%ld\n", l);
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close(fd);
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munmap(p, 512*1024*1024);
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exit(0);
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}
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