p10-7.c

来自「SUN Solaris8平台下进程间通信」· C语言 代码 · 共 26 行

#include <stropts.h>
#include <stdio.h>
#include <fcntl.h>
#include "err_exit.h"
int main(int argc, char *argv[])
{
    int     fd;
    char    firstmodule[FMNAMESZ + 1];
    if(argc != 2){
       printf("Usage: a.out <pathname>\n");
       exit(0);
    }
    if ((fd = open(argv[1],O_RDONLY)) < 0)
       err_exit("open failed");
    if (isastream(fd) == 0){
       printf("%s is not a stream\n",argv[1]);
       exit(0);
    }
    /* 获取模块名 */
    if (ioctl(fd,I_LOOK, firstmodule) < 0)
       err_exit("no module in the STREAM.");
    /* 打印模块名 */
       printf("module name = %s\n", firstmodule);
    return 0;
}