系统调用2 --creat

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>

/***********************************
*fie:creat.c
*author:QG
*time:2015-05-10
*note:exercise the function of creat
***********************************/




int main()
{
    char *pt = "./234.txt";
    int a = 0;
    int b = 0;
    
    /***************************
    *func:int creat(const char *pathname, mode_t mode);
    *parametre:
    *return:if the file created is exist,return a positive number,otherwise return -1;
    *function:
    ****************************/
    a = creat(pt,0755);
    printf("The file descreptor is %d!\n",a);
    b = open(pt,O_WRONLY);
    if(b < 0)
    {
        printf("open file fail!\n");
    }
    else printf("open file successfully! the file descriptor is %d\n",b);
    return 0;	
}