文件操作open , close, creat

open:

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

 

int open(const char * filepath, int flags);

int open(const char * filepath, int flags, mode_t mode);

fd or -1

 

close:

#include <sys/stat.h>

#include <sys/types.h>

#include <fcntl.h>

 

int close(int fd); 0 or -1

 

create:

#include <sys/stat.h>

#include <sys/types.h>

#include <fcntl.h>

 

int creat(const char * pathname, mode_t mode); fd or -1

 

A demo of open

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
int main(int argc, char ** argv)
{
 errno = 0;
 int fd;
 if(fd = open("testOpen.c", O_CREAT | O_EXCL, S_IRUSR | S_IWUSR) == -1)
 {
  perror("open");
  exit(1);
  }
 else
 printf("Open file testOpen.c successfully./n");
 close(fd);
 return 0;
}

 

save as demo_oPen.c

gcc demo_oPen.c