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agetty: add --list-speeds option 

Proposed-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
This commit is contained in:
Sami Kerola 2017-07-30 14:45:59 +01:00
parent 43a1709e3b
commit 11841430c9
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GPG Key ID: A9553245FDE9B739
2 changed files with 18 additions and 0 deletions
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3
term-utils/agetty.8
View File

@ -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

15
term-utils/agetty.c
View File

@ -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