mkstemp函数

int mkstemp(char *template)

测试代码：

#include<stdio.h>
#include<stdlib.h>
#include <unistd.h>
#include <string.h>

#define DEBUG_INFO(format, ...) printf("%s - %d - %s :: "format"\n",__FILE__,__LINE__,__func__ ,##__VA_ARGS__)
 
int main(void){
    int fd;
    char temp_file[]="tmp_XXXXXX";
    
    DEBUG_INFO("创建之前:temp_file = %s",temp_file);
    if((fd=mkstemp(temp_file))==-1){
        printf("Creat temp file faile./n");
        exit(1);
    }
    DEBUG_INFO("创建之后:temp_file = %s,fd = %d",temp_file,fd);
    /*Then you can read or write the temp file.*/
    //ADD YOUR CODE;
    //close(fd);

    write(fd,"hello world",sizeof("hello world"));
    lseek(fd,SEEK_SET,0);
    int res = access(temp_file,F_OK);
    if(res != 0){
        perror("access 1:");
    }else{
        DEBUG_INFO("access %s ok",temp_file);
    }
    unlink(temp_file);
    res = access(temp_file,F_OK);
    if(res != 0){
        perror("access:");
        DEBUG_INFO("access %s fail",temp_file);
    }
    
    char buf[100];
    memset(buf,0,sizeof(buf));
    read(fd,buf,sizeof(buf));
    DEBUG_INFO("buf = %s",buf);
    close(fd);
    
    return 0;
}

 执行结果：

/big/work/ipc/mkstemp.c - 12 - main :: 创建之前:temp_file = tmp_XXXXXX
/big/work/ipc/mkstemp.c - 17 - main :: 创建之后:temp_file = tmp_3uabCW,fd = 3
/big/work/ipc/mkstemp.c - 28 - main :: access tmp_3uabCW ok
access:: No such file or directory
/big/work/ipc/mkstemp.c - 34 - main :: access tmp_3uabCW fail
/big/work/ipc/mkstemp.c - 40 - main :: buf = hello world

实验解析

小结