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hush/miscutils/setserial.c
Denys Vlasenko 3e134ebf6a *: slap on a few ALIGN1/2s where appropriate 
The result of looking at "grep -F -B2 '*fill*' busybox_unstripped.map"

   text	   data	    bss	    dec	    hex	filename
 829901	   4086	   1904	 835891	  cc133	busybox_before
 829665	   4086	   1904	 835655	  cc047	busybox

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-04-22 18:09:21 +02:00

764 lines
16 KiB
C
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/* vi: set sw=4 ts=4: */
/*
* setserial implementation for busybox
*
*
* Copyright (C) 2011 Marek Bečka <yuen@klacno.sk>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config SETSERIAL
//config: bool "setserial"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: Retrieve or set Linux serial port.
//applet:IF_SETSERIAL(APPLET(setserial, BB_DIR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_SETSERIAL) += setserial.o
#include "libbb.h"
#include <assert.h>
#ifndef PORT_UNKNOWN
# define PORT_UNKNOWN 0
#endif
#ifndef PORT_8250
# define PORT_8250 1
#endif
#ifndef PORT_16450
# define PORT_16450 2
#endif
#ifndef PORT_16550
# define PORT_16550 3
#endif
#ifndef PORT_16550A
# define PORT_16550A 4
#endif
#ifndef PORT_CIRRUS
# define PORT_CIRRUS 5
#endif
#ifndef PORT_16650
# define PORT_16650 6
#endif
#ifndef PORT_16650V2
# define PORT_16650V2 7
#endif
#ifndef PORT_16750
# define PORT_16750 8
#endif
#ifndef PORT_STARTECH
# define PORT_STARTECH 9
#endif
#ifndef PORT_16C950
# define PORT_16C950 10
#endif
#ifndef PORT_16654
# define PORT_16654 11
#endif
#ifndef PORT_16850
# define PORT_16850 12
#endif
#ifndef PORT_RSA
# define PORT_RSA 13
#endif
#ifndef PORT_NS16550A
# define PORT_NS16550A 14
#endif
#ifndef PORT_XSCALE
# define PORT_XSCALE 15
#endif
#ifndef PORT_RM9000
# define PORT_RM9000 16
#endif
#ifndef PORT_OCTEON
# define PORT_OCTEON 17
#endif
#ifndef PORT_AR7
# define PORT_AR7 18
#endif
#ifndef PORT_U6_16550A
# define PORT_U6_16550A 19
#endif
#ifndef ASYNCB_HUP_NOTIFY
# define ASYNCB_HUP_NOTIFY 0
#endif
#ifndef ASYNCB_FOURPORT
# define ASYNCB_FOURPORT 1
#endif
#ifndef ASYNCB_SAK
# define ASYNCB_SAK 2
#endif
#ifndef ASYNCB_SPLIT_TERMIOS
# define ASYNCB_SPLIT_TERMIOS 3
#endif
#ifndef ASYNCB_SPD_HI
# define ASYNCB_SPD_HI 4
#endif
#ifndef ASYNCB_SPD_VHI
# define ASYNCB_SPD_VHI 5
#endif
#ifndef ASYNCB_SKIP_TEST
# define ASYNCB_SKIP_TEST 6
#endif
#ifndef ASYNCB_AUTO_IRQ
# define ASYNCB_AUTO_IRQ 7
#endif
#ifndef ASYNCB_SESSION_LOCKOUT
# define ASYNCB_SESSION_LOCKOUT 8
#endif
#ifndef ASYNCB_PGRP_LOCKOUT
# define ASYNCB_PGRP_LOCKOUT 9
#endif
#ifndef ASYNCB_CALLOUT_NOHUP
# define ASYNCB_CALLOUT_NOHUP 10
#endif
#ifndef ASYNCB_SPD_SHI
# define ASYNCB_SPD_SHI 12
#endif
#ifndef ASYNCB_LOW_LATENCY
# define ASYNCB_LOW_LATENCY 13
#endif
#ifndef ASYNCB_BUGGY_UART
# define ASYNCB_BUGGY_UART 14
#endif
#ifndef ASYNC_HUP_NOTIFY
# define ASYNC_HUP_NOTIFY (1U << ASYNCB_HUP_NOTIFY)
#endif
#ifndef ASYNC_FOURPORT
# define ASYNC_FOURPORT (1U << ASYNCB_FOURPORT)
#endif
#ifndef ASYNC_SAK
# define ASYNC_SAK (1U << ASYNCB_SAK)
#endif
#ifndef ASYNC_SPLIT_TERMIOS
# define ASYNC_SPLIT_TERMIOS (1U << ASYNCB_SPLIT_TERMIOS)
#endif
#ifndef ASYNC_SPD_HI
# define ASYNC_SPD_HI (1U << ASYNCB_SPD_HI)
#endif
#ifndef ASYNC_SPD_VHI
# define ASYNC_SPD_VHI (1U << ASYNCB_SPD_VHI)
#endif
#ifndef ASYNC_SKIP_TEST
# define ASYNC_SKIP_TEST (1U << ASYNCB_SKIP_TEST)
#endif
#ifndef ASYNC_AUTO_IRQ
# define ASYNC_AUTO_IRQ (1U << ASYNCB_AUTO_IRQ)
#endif
#ifndef ASYNC_SESSION_LOCKOUT
# define ASYNC_SESSION_LOCKOUT (1U << ASYNCB_SESSION_LOCKOUT)
#endif
#ifndef ASYNC_PGRP_LOCKOUT
# define ASYNC_PGRP_LOCKOUT (1U << ASYNCB_PGRP_LOCKOUT)
#endif
#ifndef ASYNC_CALLOUT_NOHUP
# define ASYNC_CALLOUT_NOHUP (1U << ASYNCB_CALLOUT_NOHUP)
#endif
#ifndef ASYNC_SPD_SHI
# define ASYNC_SPD_SHI (1U << ASYNCB_SPD_SHI)
#endif
#ifndef ASYNC_LOW_LATENCY
# define ASYNC_LOW_LATENCY (1U << ASYNCB_LOW_LATENCY)
#endif
#ifndef ASYNC_BUGGY_UART
# define ASYNC_BUGGY_UART (1U << ASYNCB_BUGGY_UART)
#endif
#ifndef ASYNC_SPD_CUST
# define ASYNC_SPD_CUST (ASYNC_SPD_HI|ASYNC_SPD_VHI)
#endif
#ifndef ASYNC_SPD_WARP
# define ASYNC_SPD_WARP (ASYNC_SPD_HI|ASYNC_SPD_SHI)
#endif
#ifndef ASYNC_SPD_MASK
# define ASYNC_SPD_MASK (ASYNC_SPD_HI|ASYNC_SPD_VHI|ASYNC_SPD_SHI)
#endif
#ifndef ASYNC_CLOSING_WAIT_INF
# define ASYNC_CLOSING_WAIT_INF 0
#endif
#ifndef ASYNC_CLOSING_WAIT_NONE
# define ASYNC_CLOSING_WAIT_NONE 65535
#endif
#ifndef _LINUX_SERIAL_H
struct serial_struct {
int type;
int line;
unsigned int port;
int irq;
int flags;
int xmit_fifo_size;
int custom_divisor;
int baud_base;
unsigned short close_delay;
char io_type;
char reserved_char[1];
int hub6;
unsigned short closing_wait; /* time to wait before closing */
unsigned short closing_wait2; /* no longer used... */
unsigned char *iomem_base;
unsigned short iomem_reg_shift;
unsigned int port_high;
unsigned long iomap_base; /* cookie passed into ioremap */
};
#endif
//usage:#define setserial_trivial_usage
//usage: "[-gabGvzV] DEVICE [PARAMETER [ARG]]..."
//usage:#define setserial_full_usage "\n\n"
//usage: "Request or set Linux serial port information\n"
//usage: "\n"
//usage: " -g Interpret parameters as list of devices for reporting\n"
//usage: " -a Print all available information\n"
//usage: " -b Print summary information\n"
//usage: " -G Print in form which can be fed back\n"
//usage: " to setserial as command line parameters\n"
//usage: " -z Zero out serial flags before setting\n"
//usage: " -v Verbose\n"
//usage: "\n"
//usage: "Parameters: (* = takes an argument, ^ = can be turned off by preceding ^)\n"
//usage: " *port, *irq, *divisor, *uart, *baud_base, *close_delay, *closing_wait,\n"
//usage: " ^fourport, ^auto_irq, ^skip_test, ^sak, ^session_lockout, ^pgrp_lockout,\n"
//usage: " ^callout_nohup, ^split_termios, ^hup_notify, ^low_latency, autoconfig,\n"
//usage: " spd_normal, spd_hi, spd_vhi, spd_shi, spd_warp, spd_cust\n"
//usage: "\n"
//usage: "UART types:\n"
//usage: " unknown, 8250, 16450, 16550, 16550A, Cirrus, 16650, 16650V2, 16750,\n"
//usage: " 16950, 16954, 16654, 16850, RSA, NS16550A, XSCALE, RM9000, OCTEON, AR7,\n"
//usage: " U6_16550A"
#define OPT_PRINT_SUMMARY (1 << 0)
#define OPT_PRINT_FEDBACK (1 << 1)
#define OPT_PRINT_ALL (1 << 2)
#define OPT_VERBOSE (1 << 3)
#define OPT_ZERO (1 << 4)
#define OPT_GET (1 << 5)
#define OPT_MODE_MASK \
(OPT_PRINT_ALL | OPT_PRINT_SUMMARY | OPT_PRINT_FEDBACK)
enum print_mode
{
PRINT_NORMAL = 0,
PRINT_SUMMARY = (1 << 0),
PRINT_FEDBACK = (1 << 1),
PRINT_ALL = (1 << 2),
};
#define CTL_SET (1 << 0)
#define CTL_CONFIG (1 << 1)
#define CTL_GET (1 << 2)
#define CTL_CLOSE (1 << 3)
#define CTL_NODIE (1 << 4)
static const char serial_types[] ALIGN1 =
"unknown\0" /* 0 */
"8250\0" /* 1 */
"16450\0" /* 2 */
"16550\0" /* 3 */
"16550A\0" /* 4 */
"Cirrus\0" /* 5 */
"16650\0" /* 6 */
"16650V2\0" /* 7 */
"16750\0" /* 8 */
"16950\0" /* 9 UNIMPLEMENTED: also know as "16950/954" */
"16954\0" /* 10 */
"16654\0" /* 11 */
"16850\0" /* 12 */
"RSA\0" /* 13 */
#ifndef SETSERIAL_BASE
"NS16550A\0" /* 14 */
"XSCALE\0" /* 15 */
"RM9000\0" /* 16 */
"OCTEON\0" /* 17 */
"AR7\0" /* 18 */
"U6_16550A\0" /* 19 */
#endif
;
#ifndef SETSERIAL_BASE
# define MAX_SERIAL_TYPE 19
#else
# define MAX_SERIAL_TYPE 13
#endif
static const char commands[] ALIGN1 =
"spd_normal\0"
"spd_hi\0"
"spd_vhi\0"
"spd_shi\0"
"spd_warp\0"
"spd_cust\0"
"sak\0"
"fourport\0"
"hup_notify\0"
"skip_test\0"
"auto_irq\0"
"split_termios\0"
"session_lockout\0"
"pgrp_lockout\0"
"callout_nohup\0"
"low_latency\0"
"port\0"
"irq\0"
"divisor\0"
"uart\0"
"baud_base\0"
"close_delay\0"
"closing_wait\0"
"autoconfig\0"
;
enum
{
CMD_SPD_NORMAL = 0,
CMD_SPD_HI,
CMD_SPD_VHI,
CMD_SPD_SHI,
CMD_SPD_WARP,
CMD_SPD_CUST,
CMD_FLAG_SAK,
CMD_FLAG_FOURPORT,
CMD_FLAG_NUP_NOTIFY,
CMD_FLAG_SKIP_TEST,
CMD_FLAG_AUTO_IRQ,
CMD_FLAG_SPLIT_TERMIOS,
CMD_FLAG_SESSION_LOCKOUT,
CMD_FLAG_PGRP_LOCKOUT,
CMD_FLAG_CALLOUT_NOHUP,
CMD_FLAG_LOW_LATENCY,
CMD_PORT,
CMD_IRQ,
CMD_DIVISOR,
CMD_UART,
CMD_BASE,
CMD_DELAY,
CMD_WAIT,
CMD_AUTOCONFIG,
CMD_FLAG_FIRST = CMD_FLAG_SAK,
CMD_FLAG_LAST = CMD_FLAG_LOW_LATENCY,
};
static bool cmd_noprint(int cmd)
{
return (cmd >= CMD_FLAG_SKIP_TEST && cmd <= CMD_FLAG_CALLOUT_NOHUP);
}
static bool cmd_is_flag(int cmd)
{
return (cmd >= CMD_FLAG_FIRST && cmd <= CMD_FLAG_LAST);
}
static bool cmd_need_arg(int cmd)
{
return (cmd >= CMD_PORT && cmd <= CMD_WAIT);
}
#define ALL_SPD ( \
ASYNC_SPD_HI | ASYNC_SPD_VHI | ASYNC_SPD_SHI | \
ASYNC_SPD_WARP | ASYNC_SPD_CUST \
)
#define ALL_FLAGS ( \
ASYNC_SAK | ASYNC_FOURPORT | ASYNC_HUP_NOTIFY | \
ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ | ASYNC_SPLIT_TERMIOS | \
ASYNC_SESSION_LOCKOUT | ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP | \
ASYNC_LOW_LATENCY \
)
#if (ALL_SPD | ALL_FLAGS) > 0xffff
# error "Unexpected flags size"
#endif
static const uint16_t setbits[CMD_FLAG_LAST + 1] =
{
0,
ASYNC_SPD_HI,
ASYNC_SPD_VHI,
ASYNC_SPD_SHI,
ASYNC_SPD_WARP,
ASYNC_SPD_CUST,
ASYNC_SAK,
ASYNC_FOURPORT,
ASYNC_HUP_NOTIFY,
ASYNC_SKIP_TEST,
ASYNC_AUTO_IRQ,
ASYNC_SPLIT_TERMIOS,
ASYNC_SESSION_LOCKOUT,
ASYNC_PGRP_LOCKOUT,
ASYNC_CALLOUT_NOHUP,
ASYNC_LOW_LATENCY
};
#define STR_INFINITE "infinite"
#define STR_NONE "none"
static const char *uart_type(int type)
{
if (type > MAX_SERIAL_TYPE)
return "undefined";
return nth_string(serial_types, type);
}
/* libbb candidate */
static int index_in_strings_case_insensitive(const char *strings, const char *key)
{
int idx = 0;
while (*strings) {
if (strcasecmp(strings, key) == 0) {
return idx;
}
strings += strlen(strings) + 1; /* skip NUL */
idx++;
}
return -1;
}
static int uart_id(const char *name)
{
return index_in_strings_case_insensitive(serial_types, name);
}
static const char *get_spd(int flags, enum print_mode mode)
{
int idx;
switch (flags & ASYNC_SPD_MASK) {
case ASYNC_SPD_HI:
idx = CMD_SPD_HI;
break;
case ASYNC_SPD_VHI:
idx = CMD_SPD_VHI;
break;
case ASYNC_SPD_SHI:
idx = CMD_SPD_SHI;
break;
case ASYNC_SPD_WARP:
idx = CMD_SPD_WARP;
break;
case ASYNC_SPD_CUST:
idx = CMD_SPD_CUST;
break;
default:
if (mode < PRINT_FEDBACK)
return NULL;
idx = CMD_SPD_NORMAL;
}
return nth_string(commands, idx);
}
static int get_numeric(const char *arg)
{
return bb_strtol(arg, NULL, 0);
}
static int get_wait(const char *arg)
{
if (strcasecmp(arg, STR_NONE) == 0)
return ASYNC_CLOSING_WAIT_NONE;
if (strcasecmp(arg, STR_INFINITE) == 0)
return ASYNC_CLOSING_WAIT_INF;
return get_numeric(arg);
}
static int get_uart(const char *arg)
{
int uart = uart_id(arg);
if (uart < 0)
bb_error_msg_and_die("illegal UART type: %s", arg);
return uart;
}
static int serial_open(const char *dev, bool quiet)
{
int fd;
fd = device_open(dev, O_RDWR | O_NONBLOCK);
if (fd < 0 && !quiet)
bb_simple_perror_msg(dev);
return fd;
}
static int serial_ctl(int fd, int ops, struct serial_struct *serinfo)
{
int ret = 0;
const char *err;
if (ops & CTL_SET) {
ret = ioctl(fd, TIOCSSERIAL, serinfo);
if (ret < 0) {
err = "can't set serial info";
goto fail;
}
}
if (ops & CTL_CONFIG) {
ret = ioctl(fd, TIOCSERCONFIG);
if (ret < 0) {
err = "can't autoconfigure port";
goto fail;
}
}
if (ops & CTL_GET) {
ret = ioctl(fd, TIOCGSERIAL, serinfo);
if (ret < 0) {
err = "can't get serial info";
goto fail;
}
}
nodie:
if (ops & CTL_CLOSE)
close(fd);
return ret;
fail:
bb_simple_perror_msg(err);
if (ops & CTL_NODIE)
goto nodie;
exit(EXIT_FAILURE);
}
static void print_flag(const char **prefix, const char *flag)
{
printf("%s%s", *prefix, flag);
*prefix = " ";
}
static void print_serial_flags(int serial_flags, enum print_mode mode,
const char *prefix, const char *postfix)
{
int i;
const char *spd, *pr;
pr = prefix;
spd = get_spd(serial_flags, mode);
if (spd)
print_flag(&pr, spd);
for (i = CMD_FLAG_FIRST; i <= CMD_FLAG_LAST; i++) {
if ((serial_flags & setbits[i])
&& (mode > PRINT_SUMMARY || !cmd_noprint(i))
) {
print_flag(&pr, nth_string(commands, i));
}
}
puts(pr == prefix ? "" : postfix);
}
static void print_closing_wait(unsigned int closing_wait)
{
switch (closing_wait) {
case ASYNC_CLOSING_WAIT_NONE:
puts(STR_NONE);
break;
case ASYNC_CLOSING_WAIT_INF:
puts(STR_INFINITE);
break;
default:
printf("%u\n", closing_wait);
}
}
static void serial_get(const char *device, enum print_mode mode)
{
int fd, ret;
const char *uart, *prefix, *postfix;
struct serial_struct serinfo;
fd = serial_open(device, /*quiet:*/ mode == PRINT_SUMMARY);
if (fd < 0)
return;
ret = serial_ctl(fd, CTL_GET | CTL_CLOSE | CTL_NODIE, &serinfo);
if (ret < 0)
return;
uart = uart_type(serinfo.type);
prefix = ", Flags: ";
postfix = "";
switch (mode) {
case PRINT_NORMAL:
printf("%s, UART: %s, Port: 0x%.4x, IRQ: %d",
device, uart, serinfo.port, serinfo.irq);
break;
case PRINT_SUMMARY:
if (!serinfo.type)
return;
printf("%s at 0x%.4x (irq = %d) is a %s",
device, serinfo.port, serinfo.irq, uart);
prefix = " (";
postfix = ")";
break;
case PRINT_FEDBACK:
printf("%s uart %s port 0x%.4x irq %d baud_base %d", device,
uart, serinfo.port, serinfo.irq, serinfo.baud_base);
prefix = " ";
break;
case PRINT_ALL:
printf("%s, Line %d, UART: %s, Port: 0x%.4x, IRQ: %d\n",
device, serinfo.line, uart, serinfo.port, serinfo.irq);
printf("\tBaud_base: %d, close_delay: %u, divisor: %d\n",
serinfo.baud_base, serinfo.close_delay,
serinfo.custom_divisor);
printf("\tclosing_wait: ");
print_closing_wait(serinfo.closing_wait);
prefix = "\tFlags: ";
postfix = "\n";
break;
default:
assert(0);
}
print_serial_flags(serinfo.flags, mode, prefix, postfix);
}
static int find_cmd(const char *cmd)
{
int idx;
idx = index_in_strings_case_insensitive(commands, cmd);
if (idx < 0)
bb_error_msg_and_die("invalid flag: %s", cmd);
return idx;
}
static void serial_set(char **arg, int opts)
{
struct serial_struct serinfo;
int cmd;
const char *word;
int fd;
fd = serial_open(*arg++, /*quiet:*/ false);
if (fd < 0)
exit(201);
serial_ctl(fd, CTL_GET, &serinfo);
if (opts & OPT_ZERO)
serinfo.flags = 0;
while (*arg) {
int invert;
word = *arg++;
invert = (*word == '^');
word += invert;
cmd = find_cmd(word);
if (*arg == NULL && cmd_need_arg(cmd))
bb_error_msg_and_die(bb_msg_requires_arg, word);
if (invert && !cmd_is_flag(cmd))
bb_error_msg_and_die("can't invert %s", word);
switch (cmd) {
case CMD_SPD_NORMAL:
case CMD_SPD_HI:
case CMD_SPD_VHI:
case CMD_SPD_SHI:
case CMD_SPD_WARP:
case CMD_SPD_CUST:
serinfo.flags &= ~ASYNC_SPD_MASK;
/* fallthrough */
case CMD_FLAG_SAK:
case CMD_FLAG_FOURPORT:
case CMD_FLAG_NUP_NOTIFY:
case CMD_FLAG_SKIP_TEST:
case CMD_FLAG_AUTO_IRQ:
case CMD_FLAG_SPLIT_TERMIOS:
case CMD_FLAG_SESSION_LOCKOUT:
case CMD_FLAG_PGRP_LOCKOUT:
case CMD_FLAG_CALLOUT_NOHUP:
case CMD_FLAG_LOW_LATENCY:
if (invert)
serinfo.flags &= ~setbits[cmd];
else
serinfo.flags |= setbits[cmd];
break;
case CMD_PORT:
serinfo.port = get_numeric(*arg++);
break;
case CMD_IRQ:
serinfo.irq = get_numeric(*arg++);
break;
case CMD_DIVISOR:
serinfo.custom_divisor = get_numeric(*arg++);
break;
case CMD_UART:
serinfo.type = get_uart(*arg++);
break;
case CMD_BASE:
serinfo.baud_base = get_numeric(*arg++);
break;
case CMD_DELAY:
serinfo.close_delay = get_numeric(*arg++);
break;
case CMD_WAIT:
serinfo.closing_wait = get_wait(*arg++);
break;
case CMD_AUTOCONFIG:
serial_ctl(fd, CTL_SET | CTL_CONFIG | CTL_GET, &serinfo);
break;
default:
assert(0);
}
}
serial_ctl(fd, CTL_SET | CTL_CLOSE, &serinfo);
}
int setserial_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int setserial_main(int argc UNUSED_PARAM, char **argv)
{
int opts;
opt_complementary = "-1:b-aG:G-ab:a-bG";
opts = getopt32(argv, "bGavzg");
argv += optind;
if (!argv[1]) /* one arg only? */
opts |= OPT_GET;
if (!(opts & OPT_GET)) {
serial_set(argv, opts);
argv[1] = NULL;
}
if (opts & (OPT_VERBOSE | OPT_GET)) {
do {
serial_get(*argv++, opts & OPT_MODE_MASK);
} while (*argv);
}
return EXIT_SUCCESS;
}
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