main.c

该代码为unix环境高级编程的源代码

#include	"open.h"
#include	<fcntl.h>

#define	BUFFSIZE	8192

int
main(int argc, char *argv[])
{
	int		n, fd;
	char	buf[BUFFSIZE], line[MAXLINE];

					/* read filename to cat from stdin */
	while (fgets(line, MAXLINE, stdin) != NULL) {
		line[strlen(line) - 1] = 0;	/* replace newline with null */

					/* open the file */
		if ( (fd = csopen(line, O_RDONLY)) < 0)
			continue;	/* csopen() prints error from server */

					/* and cat to stdout */
		while ( (n = read(fd, buf, BUFFSIZE)) > 0)
			if (write(STDOUT_FILENO, buf, n) != n)
				err_sys("write error");
		if (n < 0)
			err_sys("read error");
		close(fd);
	}

	exit(0);
}