/* * The client command for printing documents.  Opens the file * and sends it to the printer spooling daemon.  Usage: * 	print [-t] filename */#include "apue.h"#include "print.h"#include <fcntl.h>#include <pwd.h>/* * Needed for logging funtions. */int log_to_stderr = 1;void submit_file(int, int, const char *, size_t, int);intmain(int argc, char *argv[]){	int				fd, sockfd, err, text, c;	struct stat		sbuf;	char			*host;	struct addrinfo	*ailist, *aip;	err = 0;	text = 0;	while ((c = getopt(argc, argv, "t")) != -1) {		switch (c) {		case 't':			text = 1;			break;		case '?':			err = 1;			break;		}	}	if (err || (optind != argc - 1))		err_quit("usage: print [-t] filename");	if ((fd = open(argv[optind], O_RDONLY)) < 0)		err_sys("print: can't open %s", argv[1]);	if (fstat(fd, &sbuf) < 0)		err_sys("print: can't stat %s", argv[1]);	if (!S_ISREG(sbuf.st_mode))		err_quit("print: %s must be a regular file\n", argv[1]);	/*	 * Get the hostname of the host acting as the print server.	 */	if ((host = get_printserver()) == NULL)		err_quit("print: no print server defined");	if ((err = getaddrlist(host, "print", &ailist)) != 0)		err_quit("print: getaddrinfo error: %s", gai_strerror(err));	for (aip = ailist; aip != NULL; aip = aip->ai_next) {		if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {			err = errno;		} else if (connect_retry(sockfd, aip->ai_addr,		  aip->ai_addrlen) < 0) {			err = errno;		} else {			submit_file(fd, sockfd, argv[1], sbuf.st_size, text);			exit(0);		}	}	errno = err;	err_ret("print: can't contact %s", host);	exit(1);}/* * Send a file to the printer daemon. */voidsubmit_file(int fd, int sockfd, const char *fname, size_t nbytes,            int text){	int					nr, nw, len;	struct passwd		*pwd;	struct printreq		req;	struct printresp	res;	char				buf[IOBUFSZ];	/*	 * First build the header.	 */	if ((pwd = getpwuid(geteuid())) == NULL)		strcpy(req.usernm, "unknown");	else		strcpy(req.usernm, pwd->pw_name);	req.size = htonl(nbytes);	if (text)		req.flags = htonl(PR_TEXT);	else		req.flags = 0;	if ((len = strlen(fname)) >= JOBNM_MAX) {		/*		 * Truncate the filename (+-5 accounts for the leading		 * four characters and the terminating null).		 */		strcpy(req.jobnm, "... ");		strncat(req.jobnm, &fname[len-JOBNM_MAX+5], JOBNM_MAX-5);	} else {		strcpy(req.jobnm, fname);	}	/*	 * Send the header to the server.	 */	nw = writen(sockfd, &req, sizeof(struct printreq));	if (nw != sizeof(struct printreq)) {		if (nw < 0)			err_sys("can't write to print server");		else			err_quit("short write (%d/%d) to print server",			  nw, sizeof(struct printreq));	}	/*	 * Now send the file.	 */	while ((nr = read(fd, buf, IOBUFSZ)) != 0) {		nw = writen(sockfd, buf, nr);		if (nw != nr) {			if (nw < 0)				err_sys("can't write to print server");			else				err_quit("short write (%d/%d) to print server",				  nw, nr);		}	}	/*	 * Read the response.	 */	if ((nr = readn(sockfd, &res, sizeof(struct printresp))) !=	  sizeof(struct printresp))		err_sys("can't read response from server");	if (res.retcode != 0) {		printf("rejected: %s\n", res.msg);		exit(1);	} else {		printf("job ID %ld\n", ntohl(res.jobid));	}	exit(0);}