t_isastream.c

unix高级编程源代码.<<unix高级编程>>

#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);
}