c语言防重复运行
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//lockfile.c
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
int main()
{
int fd,i;
char path[]="/home/taoyong/test.txt";
extern int errno;
fd=open(path,O_WRONLY|O_CREAT);
if(fd!=-1)
{
printf("open file %s .\n",path);
printf("please input a number to lock the file.\n");
scanf("%d",&i);
if(flock(fd,LOCK_EX)==0)
{
printf("the file was locked.\n");
}
else
{
printf("the file was not locked.\n");
}
printf("please input a number to unlock the file.\n");
scanf("%d",&i);
if(flock(fd,LOCK_UN)==0)
{
printf("the file was unlocked.\n");
}
else
{
printf("the file was not unlocked.\n");
}
close(fd);
}
else
{
printf("cannot open file %s\n",path);
printf("errno:%d\n",errno);
printf("errMsg:%s",strerror(errno));
}
}
//testprocess.c
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/file.h>
int main()
{
int fd,i;
char path[]="/home/taoyong/test.txt";
char s[]="writing...\nwriting......\n";
extern int errno;
fd=open(path,O_WRONLY|O_CREAT|O_APPEND);
if(fd!=-1)
{
printf("open file %s .\n",path);
if(flock(fd,LOCK_EX|LOCK_NB)==0)
{
printf("the file was locked by the process.\n");
if(-1!=write(fd,s,sizeof(s)))
{
printf("write %s to the file %s\n",s,path);
}
else
{
printf("cannot write the file %s\n",path);
printf("errno:%d\n",errno);
printf("errMsg:%s\n",strerror(errno));
}
}
else
{
printf("the file was locked by other process.Can't write...\n");
printf("errno:%d:",errno);
}
close(fd);
}
else
{
printf("cannot open file %s\n",path);
printf("errno:%d\n",errno);
printf("errMsg:%s",strerror(errno));
}
}
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
int main()
{
int fd,i;
char path[]="/home/taoyong/test.txt";
extern int errno;
fd=open(path,O_WRONLY|O_CREAT);
if(fd!=-1)
{
printf("open file %s .\n",path);
printf("please input a number to lock the file.\n");
scanf("%d",&i);
if(flock(fd,LOCK_EX)==0)
{
printf("the file was locked.\n");
}
else
{
printf("the file was not locked.\n");
}
printf("please input a number to unlock the file.\n");
scanf("%d",&i);
if(flock(fd,LOCK_UN)==0)
{
printf("the file was unlocked.\n");
}
else
{
printf("the file was not unlocked.\n");
}
close(fd);
}
else
{
printf("cannot open file %s\n",path);
printf("errno:%d\n",errno);
printf("errMsg:%s",strerror(errno));
}
}
//testprocess.c
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/file.h>
int main()
{
int fd,i;
char path[]="/home/taoyong/test.txt";
char s[]="writing...\nwriting......\n";
extern int errno;
fd=open(path,O_WRONLY|O_CREAT|O_APPEND);
if(fd!=-1)
{
printf("open file %s .\n",path);
if(flock(fd,LOCK_EX|LOCK_NB)==0)
{
printf("the file was locked by the process.\n");
if(-1!=write(fd,s,sizeof(s)))
{
printf("write %s to the file %s\n",s,path);
}
else
{
printf("cannot write the file %s\n",path);
printf("errno:%d\n",errno);
printf("errMsg:%s\n",strerror(errno));
}
}
else
{
printf("the file was locked by other process.Can't write...\n");
printf("errno:%d:",errno);
}
close(fd);
}
else
{
printf("cannot open file %s\n",path);
printf("errno:%d\n",errno);
printf("errMsg:%s",strerror(errno));
}
}
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