top: add -m ("memory") option

[oweals/busybox.git] / loginutils / getty.c

diff --git a/loginutils/getty.c b/loginutils/getty.c
index 8b0e729fbb3a65252c49c36b64a28e8a8a273a0c..838adf2e76b116fe702ec12326a1c08256ae415d 100644 (file)
--- a/loginutils/getty.c
+++ b/loginutils/getty.c
@@ -22,13 +22,16 @@
 #include <utmp.h> /* updwtmp() */
 #endif
 
+#ifndef IUCLC
+# define IUCLC 0
+#endif
+
 /*
  * Some heuristics to find out what environment we are in: if it is not
  * System V, assume it is SunOS 4.
  */
 #ifdef LOGIN_PROCESS                    /* defined in System V utmp.h */
 #include <sys/utsname.h>
-#include <time.h>
 #else /* if !sysV style, wtmp/utmp code is off */
 #undef ENABLE_FEATURE_UTMP
 #undef ENABLE_FEATURE_WTMP
@@ -164,8 +167,9 @@ static void parse_speeds(struct options *op, char *arg)
        debug("entered parse_speeds\n");
        while ((cp = strsep(&arg, ",")) != NULL) {
                op->speeds[op->numspeed] = bcode(cp);
-               if (op->speeds[op->numspeed] <= 0)
+               if (op->speeds[op->numspeed] < 0)
                        bb_error_msg_and_die("bad speed: %s", cp);
+               /* note: arg "0" turns into speed B0 */
                op->numspeed++;
                if (op->numspeed > MAX_SPEED)
                        bb_error_msg_and_die("too many alternate speeds");
@@ -235,7 +239,7 @@ static void open_tty(const char *tty)
 //             cur_dir_fd = xopen(".", O_DIRECTORY | O_NONBLOCK);
 //             xchdir("/dev");
 //             xstat(tty, &st);
-//             if ((st.st_mode & S_IFMT) != S_IFCHR)
+//             if (!S_ISCHR(st.st_mode))
 //                     bb_error_msg_and_die("%s: not a character device", tty);
 
                if (tty[0] != '/')
@@ -271,6 +275,7 @@ static void open_tty(const char *tty)
 /* termios_init - initialize termios settings */
 static void termios_init(struct termios *tp, int speed, struct options *op)
 {
+       speed_t ispeed, ospeed;
        /*
         * Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
         * Special characters are set after we have read the login name; all
@@ -279,12 +284,20 @@ static void termios_init(struct termios *tp, int speed, struct options *op)
         */
 #ifdef __linux__
        /* flush input and output queues, important for modems! */
-       ioctl(0, TCFLSH, TCIOFLUSH);
+       ioctl(0, TCFLSH, TCIOFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
 #endif
-
-       tp->c_cflag = CS8 | HUPCL | CREAD | speed;
+       ispeed = ospeed = speed;
+       if (speed == B0) {
+               /* Speed was specified as "0" on command line.
+                * Just leave it unchanged */
+               ispeed = cfgetispeed(tp);
+               ospeed = cfgetospeed(tp);
+       }
+       tp->c_cflag = CS8 | HUPCL | CREAD;
        if (op->flags & F_LOCAL)
                tp->c_cflag |= CLOCAL;
+       cfsetispeed(tp, ispeed);
+       cfsetospeed(tp, ospeed);
 
        tp->c_iflag = tp->c_lflag = tp->c_line = 0;
        tp->c_oflag = OPOST | ONLCR;
@@ -297,7 +310,7 @@ static void termios_init(struct termios *tp, int speed, struct options *op)
                tp->c_cflag |= CRTSCTS;
 #endif
 
-       ioctl(0, TCSETS, tp);
+       tcsetattr_stdin_TCSANOW(tp);
 
        debug("term_io 2\n");
 }
@@ -334,7 +347,7 @@ static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
        tp->c_iflag |= ISTRIP;          /* enable 8th-bit stripping */
        vmin = tp->c_cc[VMIN];
        tp->c_cc[VMIN] = 0;             /* don't block if queue empty */
-       ioctl(0, TCSETS, tp);
+       tcsetattr_stdin_TCSANOW(tp);
 
        /*
         * Wait for a while, then read everything the modem has said so far and
@@ -359,7 +372,7 @@ static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
        /* Restore terminal settings. Errors will be dealt with later on. */
        tp->c_iflag = iflag;
        tp->c_cc[VMIN] = vmin;
-       ioctl(0, TCSETS, tp);
+       tcsetattr_stdin_TCSANOW(tp);
 }
 
 /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
@@ -404,7 +417,7 @@ static char *get_logname(char *logname, unsigned size_logname,
 
        /* Flush pending input (esp. after parsing or switching the baud rate). */
        sleep(1);
-       ioctl(0, TCFLSH, TCIFLUSH);
+       ioctl(0, TCFLSH, TCIFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
 
        /* Prompt for and read a login name. */
        logname[0] = '\0';
@@ -474,7 +487,7 @@ static char *get_logname(char *logname, unsigned size_logname,
                        case CTL('D'):
                                exit(EXIT_SUCCESS);
                        default:
-                               if (!isascii(ascval) || !isprint(ascval)) {
+                               if (!isprint(ascval)) {
                                        /* ignore garbage characters */
                                } else if ((int)(bp - logname) >= size_logname - 1) {
                                        bb_error_msg_and_die("%s: input overrun", op->tty);
@@ -552,12 +565,13 @@ static void termios_final(struct options *op, struct termios *tp, struct chardat
        }
 #endif
        /* Optionally enable hardware flow control */
-#ifdef  CRTSCTS
+#ifdef CRTSCTS
        if (op->flags & F_RTSCTS)
                tp->c_cflag |= CRTSCTS;
 #endif
 
        /* Finally, make the new settings effective */
+       /* It's tcsetattr_stdin_TCSANOW() + error check */
        ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty);
 }
 
@@ -689,6 +703,7 @@ int getty_main(int argc UNUSED_PARAM, char **argv)
         * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
         * 5 seconds seems to be a good value.
         */
+       /* tcgetattr() + error check */
        ioctl_or_perror_and_die(0, TCGETS, &termios, "%s: TCGETS", options.tty);
 
 #ifdef __linux__
@@ -712,6 +727,7 @@ int getty_main(int argc UNUSED_PARAM, char **argv)
        /* Write the modem init string and DON'T flush the buffers */
        if (options.flags & F_INITSTRING) {
                debug("writing init string\n");
+               /* todo: use xwrite_str? */
                full_write(STDOUT_FILENO, options.initstring, strlen(options.initstring));
        }
 
@@ -751,9 +767,9 @@ int getty_main(int argc UNUSED_PARAM, char **argv)
                                break;
                        /* we are here only if options.numspeed > 1 */
                        baud_index = (baud_index + 1) % options.numspeed;
-                       termios.c_cflag &= ~CBAUD;
-                       termios.c_cflag |= options.speeds[baud_index];
-                       ioctl(0, TCSETS, &termios);
+                       cfsetispeed(&termios, options.speeds[baud_index]);
+                       cfsetospeed(&termios, options.speeds[baud_index]);
+                       tcsetattr_stdin_TCSANOW(&termios);
                }
        }