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#include <stdio.h>
#include <unistd.h>#include <fcntl.h>#include <errno.h>int main(int argc,char* argv[])
{
int fd; int lock_result; struct flock lock; char * pFileName = "tmp.lck"; fd = open(pFileName,O_RDWR); if(fd<0)
{ printf("Open file failed.\n"); return 1;
} lock_result = lockf(fd,F_TEST,0); //参数使用F_LOCK，则如果已经加锁，则阻塞到前一个进程释放锁为止，参数0表示对整个文件加锁 //返回0表示未加锁或者被当前进程加锁；返回-1表示被其他进程加锁 if(lock_result<0) { perror("Exec lockf function failed.\n"); return 1; } lock_result = lockf(fd,F_LOCK,0); //参数使用F_LOCK，则如果已经加锁，则阻塞到前一个进程释放锁为止，参数0表示对整个文件加锁 if(lock_result<0) { perror("Exec lockf function failed.\n"); return 1; } printf("Pid: %ld process locked the file.\n",(long)getpid()); //do something
while(getchar()<0); printf("Pid: %ld process release the file.\n",(long)getpid()); return 0;
} 标签：
原文地址：http://www.cnblogs.com/lihaiping/p/4554802.html
