CentOS下对临时文件的操作之mkstemp讲解

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<span style="font-size:18px;">#include <stdio.h>  
#include <string.h>  
#include <unistd.h>  
#include <stdlib.h>  
  
int write_temp_file(char* buffer,size_t length) {  
    int len=length;  
    char filename_template[]="/tmp/temp_file.XXXXXX";  
    int fd=mkstemp(filename_template);  
    unlink(filename_template);//Unlink the file, so it'll be removed when close  
    printf("Template file name:%s\n",filename_template);  
    write(fd,&len,sizeof(len));  
    write(fd,buffer,len);  
    return fd;  
}  
  
char* read_temp_file(int fd, size_t* length) {  
    char* buffer;  
    lseek(fd,0,SEEK_SET);  
    read(fd,length,sizeof(size_t));  
    buffer=(char*)malloc(*length);  
    read(fd,buffer,*length);  
    close(fd); // Temp file will be deleted  
    return buffer;  
}  
  
int main(int argc, char** argv) {  
    char buffer[]="Test template files";  
    int fd=write_temp_file(buffer,strlen(buffer));  
    int len=0;  
    char* result=read_temp_file(fd,&len);  
    printf("Len:%d\nContent:%s\n",len,result);  
    free(result);  
    return 0;  
}</span>