fig17.27

unix环境高级编程第二版配套源代码 unix环境高级编程第二版配套源代码

#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) {
		if (line[strlen(line) - 1] == '\n')
			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);
}