学会对文件的记录锁定，及解锁。#include <stdio.h>

#include <unistd.h>

#include <fcntl.h>

int main()

{

int fd



int i

struct {

char name[20]

uint ID

int age

} myrec



fd =open(\"name\", O_RDWR|O_CREAT, 0755)



if (fd == -1) return -1



printf(\"Input your name:\") scanf(\"％s\", myrec.name)

printf(\"Inpute your ID :\") scanf(\"％d\", &myrec.ID)

printf(\"Input your age :\") scanf(\"％d\", &myrec.age)



lseek(fd, 0,SEEK_END)

lockf(fd, 1, 0)

write(fd, (void *)&myrec, sizeof(myrec))

lockf(fd, 0 ,0)



return 0

}

执行命令cc lock.c –o lock.out

Chmod +x lock.out

./lock.out