agetty: add --list-speeds option

Proposed-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>

diff --git a/term-utils/agetty.8 b/term-utils/agetty.8
index 23adff3b18a20931bac08a833aff29252ea4aed1..f216344940db713035797e828f1a851e2a8c4436 100644 (file)
--- a/term-utils/agetty.8
+++ b/term-utils/agetty.8
@@ -187,6 +187,9 @@ Since the \fB\-\-extract\-baud\fP feature may fail on heavily-loaded
 systems, you still should enable BREAK processing by enumerating all
 expected baud rates on the command line.
 .TP
+\-\-list\-speeds
+Display supported baud rates.  These are determined at compilation time.
+.TP
 \-n, \-\-skip\-login
 Do not prompt the user for a login name.  This can be used in connection
 with the \fB\-\-login\-program\fP option to invoke a non-standard login

diff --git a/term-utils/agetty.c b/term-utils/agetty.c
index a95da6f3da36bbfcc39ac0303d0e9050d696d81f..b67c2d0ff611fd20c056d8f304627d45ed13e17a 100644 (file)
--- a/term-utils/agetty.c
+++ b/term-utils/agetty.c
@@ -298,6 +298,7 @@ static void open_tty(char *tty, struct termios *tp, struct options *op);
 static void termio_init(struct options *op, struct termios *tp);
 static void reset_vc (const struct options *op, struct termios *tp);
 static void auto_baud(struct termios *tp);
+static void list_speeds(void) __attribute__((__noreturn__));
 static void output_special_char (unsigned char c, struct options *op,
                struct termios *tp, FILE *fp);
 static void do_prompt(struct options *op, struct termios *tp);
@@ -632,6 +633,7 @@ static void parse_args(int argc, char **argv, struct options *op)
                ERASE_CHARS_OPTION,
                KILL_CHARS_OPTION,
                RELOAD_OPTION,
+               LIST_SPEEDS_OPTION,
        };
        const struct option longopts[] = {
                {  "8bits",          no_argument,        NULL,  '8'  },
@@ -649,6 +651,7 @@ static void parse_args(int argc, char **argv, struct options *op)
                {  "login-program",  required_argument,  NULL,  'l'  },
                {  "local-line",     optional_argument,  NULL,  'L'  },
                {  "extract-baud",   no_argument,        NULL,  'm'  },
+               {  "list-speeds",    no_argument,        NULL,  LIST_SPEEDS_OPTION },
                {  "skip-login",     no_argument,        NULL,  'n'  },
                {  "nonewline",      no_argument,        NULL,  'N'  },
                {  "login-options",  required_argument,  NULL,  'o'  },
@@ -784,6 +787,8 @@ static void parse_args(int argc, char **argv, struct options *op)
                case RELOAD_OPTION:
                        reload_agettys();
                        exit(EXIT_SUCCESS);
+               case LIST_SPEEDS_OPTION:
+                       list_speeds();
                case VERSION_OPTION:
                        printf(UTIL_LINUX_VERSION);
                        exit(EXIT_SUCCESS);
@@ -2073,6 +2078,7 @@ static void __attribute__((__noreturn__)) usage(void)
        fputs(_("     --delay <number>       sleep seconds before prompt\n"), out);
        fputs(_("     --nice <number>        run login with this priority\n"), out);
        fputs(_("     --reload               reload prompts on running agetty instances\n"), out);
+       fputs(_("     --list-speeds          display supported baud rates\n"), out);
        printf( "     --help                 %s\n", USAGE_OPTSTR_HELP);
        printf( "     --version              %s\n", USAGE_OPTSTR_VERSION);
        printf(USAGE_MAN_TAIL("agetty(8)"));
@@ -2080,6 +2086,15 @@ static void __attribute__((__noreturn__)) usage(void)
        exit(EXIT_SUCCESS);
 }
 
+static void __attribute__((__noreturn__)) list_speeds(void)
+{
+       const struct Speedtab *sp;
+
+       for (sp = speedtab; sp->speed; sp++)
+               printf("%10ld\n", sp->speed);
+       exit(EXIT_SUCCESS);
+}
+
 /*
  * Helper function reports errors to console or syslog.
  * Will be used by log_err() and log_warn() therefore