t_isastream.c

unix环境高级编程的源代码

#include    <sys/types.h>
#include    <sys/fcntl.h>
#include    "ourhdr.h"

int
main(int argc, char *argv[])
{
    int        i, fd;

    for (i = 1; i < argc; i++) {
        printf("%s: ", argv[i]);
        if ( (fd = open(argv[i], O_RDONLY)) < 0) {
            err_ret("%s: can't open", argv[i]);
            continue;
        }

        if (isastream(fd) == 0)
            err_ret("%s: not a stream", argv[i]);
        else
            err_msg("%s: streams device", argv[i]);
    }
    exit(0);
}