1 /* vi: set sw=4 ts=4: */
2 /* agetty.c - another getty program for Linux. By W. Z. Venema 1989
3 Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
4 This program is freely distributable. The entire man-page used to
5 be here. Now read the real man-page agetty.8 instead.
7 -f option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
9 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
10 - added Native Language Support
12 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net>
13 - enable hardware flow control before displaying /etc/issue
21 #include <sys/ioctl.h>
24 #include <sys/signal.h>
32 #ifdef CONFIG_FEATURE_UTMP
36 #define _PATH_LOGIN "/bin/login"
38 /* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */
40 #include <sys/param.h>
47 * Some heuristics to find out what environment we are in: if it is not
48 * System V, assume it is SunOS 4.
51 #ifdef LOGIN_PROCESS /* defined in System V utmp.h */
52 #define SYSV_STYLE /* select System V style getty */
53 #ifdef CONFIG_FEATURE_WTMP
54 extern void updwtmp(const char *filename, const struct utmp *ut);
56 #endif /* LOGIN_PROCESS */
59 * Things you may want to modify.
61 * If ISSUE is not defined, agetty will never display the contents of the
62 * /etc/issue file. You will not want to spit out large "issue" files at the
63 * wrong baud rate. Relevant for System V only.
65 * You may disagree with the default line-editing etc. characters defined
66 * below. Note, however, that DEL cannot be used for interrupt generation
67 * and for line editing at the same time.
71 #define ISSUE "/etc/issue" /* displayed before the login prompt */
72 #include <sys/utsname.h>
76 /* Some shorthands for control characters. */
78 #define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
79 #define CR CTL('M') /* carriage return */
80 #define NL CTL('J') /* line feed */
81 #define BS CTL('H') /* back space */
82 #define DEL CTL('?') /* delete */
84 /* Defaults for line-editing etc. characters; you may want to change this. */
86 #define DEF_ERASE DEL /* default erase character */
87 #define DEF_INTR CTL('C') /* default interrupt character */
88 #define DEF_QUIT CTL('\\') /* default quit char */
89 #define DEF_KILL CTL('U') /* default kill char */
90 #define DEF_EOF CTL('D') /* default EOF char */
92 #define DEF_SWITCH 0 /* default switch char */
95 * SunOS 4.1.1 termio is broken. We must use the termios stuff instead,
96 * because the termio -> termios translation does not clear the termios
97 * CIBAUD bits. Therefore, the tty driver would sometimes report that input
98 * baud rate != output baud rate. I did not notice that problem with SunOS
99 * 4.1. We will use termios where available, and termio otherwise.
102 /* linux 0.12 termio is broken too, if we use it c_cc[VERASE] isn't set
103 properly, but all is well if we use termios?! */
109 #define termio termios
110 #define TCGETA TCGETS
111 #define TCSETA TCSETS
112 #define TCSETAW TCSETSW
116 * This program tries to not use the standard-i/o library. This keeps the
117 * executable small on systems that do not have shared libraries (System V
125 * When multiple baud rates are specified on the command line, the first one
126 * we will try is the first one specified.
129 #define FIRST_SPEED 0
131 /* Storage for command-line options. */
133 #define MAX_SPEED 10 /* max. nr. of baud rates */
136 int flags; /* toggle switches, see below */
137 int timeout; /* time-out period */
138 char *login; /* login program */
139 char *tty; /* name of tty */
140 char *initstring; /* modem init string */
141 char *issue; /* alternative issue file */
142 int numspeed; /* number of baud rates to try */
143 int speeds[MAX_SPEED]; /* baud rates to be tried */
146 #define F_PARSE (1<<0) /* process modem status messages */
147 #define F_ISSUE (1<<1) /* display /etc/issue */
148 #define F_RTSCTS (1<<2) /* enable RTS/CTS flow control */
149 #define F_LOCAL (1<<3) /* force local */
150 #define F_INITSTRING (1<<4) /* initstring is set */
151 #define F_WAITCRLF (1<<5) /* wait for CR or LF */
152 #define F_CUSTISSUE (1<<6) /* give alternative issue file */
153 #define F_NOPROMPT (1<<7) /* don't ask for login name! */
155 /* Storage for things detected while the login name was read. */
158 int erase; /* erase character */
159 int kill; /* kill character */
160 int eol; /* end-of-line character */
161 int parity; /* what parity did we see */
162 int capslock; /* upper case without lower case */
165 /* Initial values for the above. */
167 static struct chardata init_chardata = {
168 DEF_ERASE, /* default erase character */
169 DEF_KILL, /* default kill character */
170 13, /* default eol char */
171 0, /* space parity */
181 static struct Speedtab speedtab[] = {
220 static void parse_args(int argc, char **argv, struct options *op);
221 static void parse_speeds(struct options *op, char *arg);
222 static void open_tty(char *tty, struct termio *tp, int local);
223 static void termio_init(struct termio *tp, int speed, struct options *op);
224 static void auto_baud(struct termio *tp);
225 static void do_prompt(struct options *op, struct termio *tp);
226 static void next_speed(struct termio *tp, struct options *op);
227 static char *get_logname(struct options *op, struct chardata *cp,
230 static void termio_final(struct options *op, struct termio *tp,
232 struct chardata *cp);
233 static int caps_lock(const char *s);
234 static int bcode(char *s);
235 static void error(const char *fmt, ...) __attribute__ ((noreturn));
238 #ifdef CONFIG_FEATURE_UTMP
239 static void update_utmp(char *line);
243 /* The following is used for understandable diagnostics. */
245 /* Fake hostname for ut_host specified on command line. */
246 static char *fakehost = NULL;
250 #define debug(s) fprintf(dbf,s); fflush(dbf)
251 #define DEBUGTERM "/dev/ttyp0"
254 #define debug(s) /* nothing */
257 int getty_main(int argc, char **argv)
259 char *logname = NULL; /* login name, given to /bin/login */
260 struct chardata chardata; /* set by get_logname() */
261 struct termio termio; /* terminal mode bits */
262 static struct options options = {
263 F_ISSUE, /* show /etc/issue (SYSV_STYLE) */
265 _PATH_LOGIN, /* default login program */
266 "tty1", /* default tty line */
267 "", /* modem init string */
269 ISSUE, /* default issue file */
273 0, /* no baud rates known yet */
277 dbf = bb_xfopen(DEBUGTERM, "w");
282 for (i = 1; i < argc; i++) {
289 /* Parse command-line arguments. */
291 parse_args(argc, argv, &options);
297 /* Update the utmp file. */
301 #ifdef CONFIG_FEATURE_UTMP
302 update_utmp(options.tty);
306 debug("calling open_tty\n");
307 /* Open the tty as standard { input, output, error }. */
308 open_tty(options.tty, &termio, options.flags & F_LOCAL);
315 ioctl(0, TIOCSPGRP, &iv);
318 /* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */
319 debug("calling termio_init\n");
320 termio_init(&termio, options.speeds[FIRST_SPEED], &options);
322 /* write the modem init string and DON'T flush the buffers */
323 if (options.flags & F_INITSTRING) {
324 debug("writing init string\n");
325 write(1, options.initstring, strlen(options.initstring));
328 if (!(options.flags & F_LOCAL)) {
329 /* go to blocking write mode unless -L is specified */
330 fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK);
333 /* Optionally detect the baud rate from the modem status message. */
334 debug("before autobaud\n");
335 if (options.flags & F_PARSE)
338 /* Set the optional timer. */
340 (void) alarm((unsigned) options.timeout);
342 /* optionally wait for CR or LF before writing /etc/issue */
343 if (options.flags & F_WAITCRLF) {
346 debug("waiting for cr-lf\n");
347 while (read(0, &ch, 1) == 1) {
348 ch &= 0x7f; /* strip "parity bit" */
350 fprintf(dbf, "read %c\n", ch);
352 if (ch == '\n' || ch == '\r')
357 chardata = init_chardata;
358 if (!(options.flags & F_NOPROMPT)) {
359 /* Read the login name. */
360 debug("reading login name\n");
361 /* while ((logname = get_logname(&options, &chardata, &termio)) == 0) */
362 while ((logname = get_logname(&options, &chardata, &termio)) ==
363 NULL) next_speed(&termio, &options);
371 /* Finalize the termio settings. */
373 termio_final(&options, &termio, &chardata);
375 /* Now the newline character should be properly written. */
377 (void) write(1, "\n", 1);
379 /* Let the login program take care of password validation. */
381 (void) execl(options.login, options.login, "--", logname, (char *) 0);
382 error("%s: can't exec %s: %m", options.tty, options.login);
385 /* parse-args - parse command-line arguments */
387 static void parse_args(int argc, char **argv, struct options *op)
389 extern char *optarg; /* getopt */
390 extern int optind; /* getopt */
393 while (isascii(c = getopt(argc, argv, "I:LH:f:hil:mt:wn"))) {
396 if (!(op->initstring = strdup(optarg)))
397 error(bb_msg_memory_exhausted);
403 /* copy optarg into op->initstring decoding \ddd
404 octal codes into chars */
410 *q++ = bb_process_escape_sequence(&p);
417 op->flags |= F_INITSTRING;
420 case 'L': /* force local */
421 op->flags |= F_LOCAL;
423 case 'H': /* fake login host */
426 case 'f': /* custom issue file */
427 op->flags |= F_CUSTISSUE;
430 case 'h': /* enable h/w flow control */
431 op->flags |= F_RTSCTS;
433 case 'i': /* do not show /etc/issue */
434 op->flags &= ~F_ISSUE;
437 op->login = optarg; /* non-default login program */
439 case 'm': /* parse modem status message */
440 op->flags |= F_PARSE;
443 op->flags |= F_NOPROMPT;
445 case 't': /* time out */
446 if ((op->timeout = atoi(optarg)) <= 0)
447 error("bad timeout value: %s", optarg);
450 op->flags |= F_WAITCRLF;
456 debug("after getopt loop\n");
457 if (argc < optind + 2) /* check parameter count */
460 /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
461 if ('0' <= argv[optind][0] && argv[optind][0] <= '9') {
462 /* a number first, assume it's a speed (BSD style) */
463 parse_speeds(op, argv[optind++]); /* baud rate(s) */
464 op->tty = argv[optind]; /* tty name */
466 op->tty = argv[optind++]; /* tty name */
467 parse_speeds(op, argv[optind]); /* baud rate(s) */
471 if (argc > optind && argv[optind])
472 setenv("TERM", argv[optind], 1);
474 debug("exiting parseargs\n");
477 /* parse_speeds - parse alternate baud rates */
479 static void parse_speeds(struct options *op, char *arg)
483 debug("entered parse_speeds\n");
484 for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
485 if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
486 error("bad speed: %s", cp);
487 if (op->numspeed > MAX_SPEED)
488 error("too many alternate speeds");
490 debug("exiting parsespeeds\n");
494 #ifdef CONFIG_FEATURE_UTMP
496 /* update_utmp - update our utmp entry */
497 static void update_utmp(char *line)
502 int mypid = getpid();
503 #if ! (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
508 * The utmp file holds miscellaneous information about things started by
509 * /sbin/init and other system-related events. Our purpose is to update
510 * the utmp entry for the current process, in particular the process type
511 * and the tty line we are listening to. Return successfully only if the
512 * utmp file can be opened for update, and if we are able to find our
513 * entry in the utmp file.
515 if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
516 close(creat(_PATH_UTMP, 0664));
518 utmpname(_PATH_UTMP);
520 while ((utp = getutent())
521 && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */
525 memcpy(&ut, utp, sizeof(ut));
527 /* some inits don't initialize utmp... */
528 memset(&ut, 0, sizeof(ut));
529 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
533 strncpy(ut.ut_user, "LOGIN", sizeof(ut.ut_user));
534 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
536 strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
539 ut.ut_type = LOGIN_PROCESS;
545 #ifdef CONFIG_FEATURE_WTMP
546 if (access(_PATH_WTMP, R_OK|W_OK) == -1)
547 close(creat(_PATH_WTMP, 0664));
548 updwtmp(_PATH_WTMP, &ut);
552 #endif /* CONFIG_FEATURE_UTMP */
553 #endif /* SYSV_STYLE */
555 /* open_tty - set up tty as standard { input, output, error } */
556 static void open_tty(char *tty, struct termio *tp, int local)
558 /* Set up new standard input, unless we are given an already opened port. */
560 if (strcmp(tty, "-")) {
564 /* Sanity checks... */
567 error("/dev: chdir() failed: %m");
568 if (stat(tty, &st) < 0)
569 error("/dev/%s: %m", tty);
570 if ((st.st_mode & S_IFMT) != S_IFCHR)
571 error("/dev/%s: not a character device", tty);
573 /* Open the tty as standard input. */
576 fd = open(tty, O_RDWR | O_NONBLOCK, 0);
577 if (dup2(fd, STDIN_FILENO) == -1)
578 error("/dev/%s: cannot open as standard input: %m", tty);
584 * Standard input should already be connected to an open port. Make
585 * sure it is open for read/write.
588 if ((fcntl(0, F_GETFL, 0) & O_RDWR) != O_RDWR)
589 error("%s: not open for read/write", tty);
592 /* Replace current standard output/error fd's with new ones */
594 if (dup2(STDIN_FILENO, STDOUT_FILENO) == -1 ||
595 dup2(STDIN_FILENO, STDERR_FILENO) == -1)
596 error("%s: dup problem: %m", tty); /* we have a problem */
599 * The following ioctl will fail if stdin is not a tty, but also when
600 * there is noise on the modem control lines. In the latter case, the
601 * common course of action is (1) fix your cables (2) give the modem more
602 * time to properly reset after hanging up. SunOS users can achieve (2)
603 * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
604 * 5 seconds seems to be a good value.
607 if (ioctl(0, TCGETA, tp) < 0)
608 error("%s: ioctl: %m", tty);
611 * It seems to be a terminal. Set proper protections and ownership. Mode
612 * 0622 is suitable for SYSV <4 because /bin/login does not change
613 * protections. SunOS 4 login will change the protections to 0620 (write
614 * access for group tty) after the login has succeeded.
619 /* tty to root.dialout 660 */
623 id = (gr = getgrnam("dialout")) ? gr->gr_gid : 0;
627 /* vcs,vcsa to root.sys 600 */
628 if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) {
631 if (!(vcs = strdup(tty)))
632 error("Can't malloc for vcs");
633 if (!(vcsa = malloc(strlen(tty) + 2)))
634 error("Can't malloc for vcsa");
636 strcpy(vcs + 3, tty + 3);
637 strcpy(vcsa, "vcsa");
638 strcpy(vcsa + 4, tty + 3);
640 id = (gr = getgrnam("sys")) ? gr->gr_gid : 0;
651 (void) chown(tty, 0, 0); /* root, sys */
652 (void) chmod(tty, 0622); /* crw--w--w- */
653 errno = 0; /* ignore above errors */
657 /* termio_init - initialize termio settings */
659 static void termio_init(struct termio *tp, int speed, struct options *op)
663 * Initial termio settings: 8-bit characters, raw-mode, blocking i/o.
664 * Special characters are set after we have read the login name; all
665 * reads will be done in raw mode anyway. Errors will be dealt with
669 /* flush input and output queues, important for modems! */
670 (void) ioctl(0, TCFLSH, TCIOFLUSH);
673 tp->c_cflag = CS8 | HUPCL | CREAD | speed;
674 if (op->flags & F_LOCAL) {
675 tp->c_cflag |= CLOCAL;
678 tp->c_iflag = tp->c_lflag = tp->c_oflag = tp->c_line = 0;
682 /* Optionally enable hardware flow control */
685 if (op->flags & F_RTSCTS)
686 tp->c_cflag |= CRTSCTS;
689 (void) ioctl(0, TCSETA, tp);
691 /* go to blocking input even in local mode */
692 fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK);
694 debug("term_io 2\n");
697 /* auto_baud - extract baud rate from modem status message */
698 static void auto_baud(struct termio *tp)
708 * This works only if the modem produces its status code AFTER raising
709 * the DCD line, and if the computer is fast enough to set the proper
710 * baud rate before the message has gone by. We expect a message of the
713 * <junk><number><junk>
715 * The number is interpreted as the baud rate of the incoming call. If the
716 * modem does not tell us the baud rate within one second, we will keep
717 * using the current baud rate. It is advisable to enable BREAK
718 * processing (comma-separated list of baud rates) if the processing of
719 * modem status messages is enabled.
723 * Use 7-bit characters, don't block if input queue is empty. Errors will
724 * be dealt with lateron.
728 tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
729 vmin = tp->c_cc[VMIN];
730 tp->c_cc[VMIN] = 0; /* don't block if queue empty */
731 (void) ioctl(0, TCSETA, tp);
734 * Wait for a while, then read everything the modem has said so far and
735 * try to extract the speed of the dial-in call.
739 if ((nread = read(0, buf, sizeof(buf) - 1)) > 0) {
741 for (bp = buf; bp < buf + nread; bp++) {
742 if (isascii(*bp) && isdigit(*bp)) {
743 if ((speed = bcode(bp))) {
744 tp->c_cflag &= ~CBAUD;
745 tp->c_cflag |= speed;
751 /* Restore terminal settings. Errors will be dealt with lateron. */
754 tp->c_cc[VMIN] = vmin;
755 (void) ioctl(0, TCSETA, tp);
758 /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
759 static void do_prompt(struct options *op, struct termio *tp)
761 #ifdef ISSUE /* optional: show /etc/issue */
762 print_login_issue(op->issue, op->tty);
764 print_login_prompt();
767 /* next_speed - select next baud rate */
768 static void next_speed(struct termio *tp, struct options *op)
770 static int baud_index = FIRST_SPEED; /* current speed index */
772 baud_index = (baud_index + 1) % op->numspeed;
773 tp->c_cflag &= ~CBAUD;
774 tp->c_cflag |= op->speeds[baud_index];
775 (void) ioctl(0, TCSETA, tp);
778 /* get_logname - get user name, establish parity, speed, erase, kill, eol */
779 /* return NULL on failure, logname on success */
780 static char *get_logname(struct options *op, struct chardata *cp, struct termio *tp)
782 static char logname[BUFSIZ];
784 char c; /* input character, full eight bits */
785 char ascval; /* low 7 bits of input character */
786 int bits; /* # of "1" bits per character */
787 int mask; /* mask with 1 bit up */
788 static char *erase[] = { /* backspace-space-backspace */
789 "\010\040\010", /* space parity */
790 "\010\040\010", /* odd parity */
791 "\210\240\210", /* even parity */
792 "\210\240\210", /* no parity */
795 /* Initialize kill, erase, parity etc. (also after switching speeds). */
799 /* Flush pending input (esp. after parsing or switching the baud rate). */
802 (void) ioctl(0, TCFLSH, TCIFLUSH);
804 /* Prompt for and read a login name. */
806 for (*logname = 0; *logname == 0; /* void */ ) {
808 /* Write issue file and prompt, with "parity" bit == 0. */
812 /* Read name, watch for break, parity, erase, kill, end-of-line. */
814 for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) {
816 /* Do not report trivial EINTR/EIO errors. */
818 if (read(0, &c, 1) < 1) {
819 if (errno == EINTR || errno == EIO)
821 error("%s: read: %m", op->tty);
823 /* Do BREAK handling elsewhere. */
825 if ((c == 0) && op->numspeed > 1)
829 /* Do parity bit handling. */
831 if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */
832 for (bits = 1, mask = 1; mask & 0177; mask <<= 1)
834 bits++; /* count "1" bits */
835 cp->parity |= ((bits & 1) ? 1 : 2);
837 /* Do erase, kill and end-of-line processing. */
842 *bp = 0; /* terminate logname */
843 cp->eol = ascval; /* set end-of-line char */
848 cp->erase = ascval; /* set erase character */
850 (void) write(1, erase[cp->parity], 3);
856 cp->kill = ascval; /* set kill character */
857 while (bp > logname) {
858 (void) write(1, erase[cp->parity], 3);
865 if (!isascii(ascval) || !isprint(ascval)) {
866 /* ignore garbage characters */ ;
867 } else if (bp - logname >= sizeof(logname) - 1) {
868 error("%s: input overrun", op->tty);
870 (void) write(1, &c, 1); /* echo the character */
871 *bp++ = ascval; /* and store it */
877 /* Handle names with upper case and no lower case. */
879 if ((cp->capslock = caps_lock(logname))) {
880 for (bp = logname; *bp; bp++)
882 *bp = tolower(*bp); /* map name to lower case */
887 /* termio_final - set the final tty mode bits */
888 static void termio_final(struct options *op, struct termio *tp, struct chardata *cp)
890 /* General terminal-independent stuff. */
892 tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
893 tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
894 /* no longer| ECHOCTL | ECHOPRT */
895 tp->c_oflag |= OPOST;
896 /* tp->c_cflag = 0; */
897 tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
898 tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
899 tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
900 tp->c_cc[VEOL] = DEF_EOL;
901 tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
903 /* Account for special characters seen in input. */
906 tp->c_iflag |= ICRNL; /* map CR in input to NL */
907 tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
909 tp->c_cc[VERASE] = cp->erase; /* set erase character */
910 tp->c_cc[VKILL] = cp->kill; /* set kill character */
912 /* Account for the presence or absence of parity bits in input. */
914 switch (cp->parity) {
915 case 0: /* space (always 0) parity */
917 case 1: /* odd parity */
918 tp->c_cflag |= PARODD;
920 case 2: /* even parity */
921 tp->c_cflag |= PARENB;
922 tp->c_iflag |= INPCK | ISTRIP;
924 case (1 | 2): /* no parity bit */
925 tp->c_cflag &= ~CSIZE;
929 /* Account for upper case without lower case. */
932 tp->c_iflag |= IUCLC;
933 tp->c_lflag |= XCASE;
934 tp->c_oflag |= OLCUC;
936 /* Optionally enable hardware flow control */
939 if (op->flags & F_RTSCTS)
940 tp->c_cflag |= CRTSCTS;
943 /* Finally, make the new settings effective */
945 if (ioctl(0, TCSETA, tp) < 0)
946 error("%s: ioctl: TCSETA: %m", op->tty);
949 /* caps_lock - string contains upper case without lower case */
950 /* returns 1 if true, 0 if false */
951 static int caps_lock(const char *s)
955 for (capslock = 0; *s; s++) {
959 capslock = isupper(*s);
964 /* bcode - convert speed string to speed code; return 0 on failure */
965 static int bcode(char *s)
969 if (safe_strtoul(s, &value)) {
972 if ((r = bb_value_to_baud(value)) > 0) {
978 /* error - report errors to console or syslog; only understands %s and %m */
980 #define str2cpy(b,s1,s2) strcat(strcpy(b,s1),s2)
983 * output error messages
985 static void error(const char *fmt, ...)
998 strncpy(buf, bb_applet_name, 256);
999 strncat(buf, ": ", 256);
1001 bp = buf + strlen(buf);
1004 va_start(va_alist, fmt);
1005 vsnprintf(bp, 256 - strlen(buf), fmt, va_alist);
1010 openlog(bb_applet_name, 0, LOG_AUTH);
1011 syslog(LOG_ERR, "%s", buf);
1014 strncat(bp, "\r\n", 256 - strlen(buf));
1016 if ((fd = open("/dev/console", 1)) >= 0) {
1017 write(fd, buf, strlen(buf));
1021 (void) sleep((unsigned) 10); /* be kind to init(8) */