使用unlink特性保证，系统崩溃时临时文件不占用系统空间

使用unlink特性保证，系统崩溃时临时文件不占用系统空间

#include <stdio.h>#include <string.h>#include <fcntl.h>#include <sys/types.h>#include <sys/stat.h>#include <unistd.h>#include <time.h>int main(int argc, char *argv[]){    char *psFileName = "/xxx/yyy.tmp";    int nfd = open(psFileName, O_CREAT | O_RDWR);    unlink(psFileName);    int k = 0;    char buffer[1024] = { 0 };    while(k++ < 3)    {        snprintf(buffer, 1024, "test : %lu\r\n", time(NULL));        int n = write(nfd, buffer, strlen(buffer));        printf("write len %d\r\n", n);        sleep(1);    }    lseek(nfd, SEEK_SET, 0);    char rbuffer[1024] = { 0 };    read(nfd, rbuffer, 1024);    printf("read:[%s]\r\n", rbuffer);    printf("waiting for exit...\r\n");    sleep(60);    close(nfd);    return 0;}