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libbb: consolidate the code to set termios unbuffered mode

Browse Source 
function                                             old     new   delta
set_termios_to_raw                                     -     116    +116
count_lines                                           72      74      +2
powertop_main                                       1458    1430     -28
top_main                                             943     914     -29
more_main                                            759     714     -45
fsck_minix_main                                     2969    2921     -48
conspy_main                                         1197    1135     -62
rawmode                                               99      36     -63
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/6 up/down: 118/-275)         Total: -157 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-01-11 16:17:59 +01:00
parent 8944c67b1f
commit 01ccdd1d3c
15 changed files with 71 additions and 55 deletions
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15
editors/vi.c
View File

@ -354,7 +354,7 @@ struct globals {
#if ENABLE_FEATURE_VI_USE_SIGNALS
sigjmp_buf restart; // catch_sig()
#endif
struct termios term_orig, term_vi; // remember what the cooked mode was
struct termios term_orig; // remember what the cooked mode was
#if ENABLE_FEATURE_VI_COLON
char *initial_cmds[3]; // currently 2 entries, NULL terminated
#endif
@ -462,7 +462,6 @@ struct globals {
#define context_end (G.context_end )
#define restart (G.restart )
#define term_orig (G.term_orig )
#define term_vi (G.term_vi )
#define initial_cmds (G.initial_cmds )
#define readbuffer (G.readbuffer )
#define scr_out_buf (G.scr_out_buf )
@ -2731,15 +2730,9 @@ static char *swap_context(char *p) // goto new context for '' command make this
//----- Set terminal attributes --------------------------------
static void rawmode(void)
{
tcgetattr(0, &term_orig);
term_vi = term_orig;
term_vi.c_lflag &= (~ICANON & ~ECHO); // leave ISIG on - allow intr's
term_vi.c_iflag &= (~IXON & ~ICRNL);
term_vi.c_oflag &= (~ONLCR);
term_vi.c_cc[VMIN] = 1;
term_vi.c_cc[VTIME] = 0;
erase_char = term_vi.c_cc[VERASE];
tcsetattr_stdin_TCSANOW(&term_vi);
// no TERMIOS_CLEAR_ISIG: leave ISIG on - allow signals
set_termios_to_raw(STDIN_FILENO, &term_orig, TERMIOS_RAW_CRNL);
erase_char = term_orig.c_cc[VERASE];
}
static void cookmode(void)

4
include/libbb.h
View File

@ -1438,6 +1438,10 @@ int get_terminal_width_height(int fd, unsigned *width, unsigned *height) FAST_FU
int get_terminal_width(int fd) FAST_FUNC;
int tcsetattr_stdin_TCSANOW(const struct termios *tp) FAST_FUNC;
#define TERMIOS_CLEAR_ISIG (1 << 0)
#define TERMIOS_RAW_CRNL (1 << 1)
#define TERMIOS_RAW_INPUT (1 << 2)
int set_termios_to_raw(int fd, struct termios *oldterm, int flags) FAST_FUNC;
/* NB: "unsigned request" is crucial! "int request" will break some arches! */
int ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5))) FAST_FUNC;

2
libbb/lineedit.c
View File

@ -2325,7 +2325,7 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
/* ~ECHO, ~ECHONL: turn off echoing, including newline echoing */
/* ~ISIG: turn off INTR (ctrl-C), QUIT, SUSP */
new_settings.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG);
/* reads would block only if < 1 char is available */
/* reads will block only if < 1 char is available */
new_settings.c_cc[VMIN] = 1;
/* no timeout (reads block forever) */
new_settings.c_cc[VTIME] = 0;

37
libbb/xfuncs.c
View File

@ -311,6 +311,43 @@ int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
return tcsetattr(STDIN_FILENO, TCSANOW, tp);
}
int FAST_FUNC set_termios_to_raw(int fd, struct termios *oldterm, int flags)
{
//TODO: lineedit, microcom and less might be adapted to use this too:
// grep for "tcsetattr"
struct termios newterm;
tcgetattr(fd, oldterm);
newterm = *oldterm;
/* Turn off buffered input (ICANON)
* Turn off echoing (ECHO)
* and separate echoing of newline (ECHONL, normally off anyway)
*/
newterm.c_lflag &= ~(ICANON | ECHO | ECHONL);
if (flags & TERMIOS_CLEAR_ISIG) {
/* dont recognize INT/QUIT/SUSP chars */
newterm.c_lflag &= ~ISIG;
}
/* reads will block only if < 1 char is available */
newterm.c_cc[VMIN] = 1;
/* no timeout (reads block forever) */
newterm.c_cc[VTIME] = 0;
if (flags & TERMIOS_RAW_CRNL) {
/* dont convert CR to NL on input */
newterm.c_iflag &= ~(IXON | ICRNL);
/* dont convert NL to CR on output */
newterm.c_oflag &= ~(ONLCR);
}
if (flags & TERMIOS_RAW_INPUT) {
/* dont convert anything on input */
newterm.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL);
}
return tcsetattr(fd, TCSANOW, &newterm);
}
pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options)
{
pid_t r;

2
loginutils/getty.c
View File

@ -316,7 +316,7 @@ static void init_tty_attrs(int speed)
/* non-raw output; add CR to each NL */
G.tty_attrs.c_oflag = OPOST | ONLCR;
/* reads would block only if < 1 char is available */
/* reads will block only if < 1 char is available */
G.tty_attrs.c_cc[VMIN] = 1;
/* no timeout (reads block forever) */
G.tty_attrs.c_cc[VTIME] = 0;

8
loginutils/vlock.c
View File

@ -105,12 +105,12 @@ int vlock_main(int argc UNUSED_PARAM, char **argv)
ioctl(STDIN_FILENO, VT_SETMODE, &vtm);
#endif
//TODO: use set_termios_to_raw()
tcgetattr(STDIN_FILENO, &oterm);
term = oterm;
term.c_iflag &= ~BRKINT;
term.c_iflag |= IGNBRK;
term.c_lflag &= ~ISIG;
term.c_lflag &= ~(ECHO | ECHOCTL);
term.c_iflag |= IGNBRK; /* ignore serial break (why? VTs don't have breaks, right?) */
term.c_iflag &= ~BRKINT; /* redundant? "dont translate break to SIGINT" */
term.c_lflag &= ~(ISIG | ECHO | ECHOCTL); /* ignore ^C ^Z, echo off */
tcsetattr_stdin_TCSANOW(&term);
while (1) {

1
miscutils/chat.c
View File

@ -213,6 +213,7 @@ int chat_main(int argc UNUSED_PARAM, char **argv)
, signal_handler);
#if ENABLE_FEATURE_CHAT_TTY_HIFI
//TODO: use set_termios_to_raw()
tcgetattr(STDIN_FILENO, &tio);
tio0 = tio;
cfmakeraw(&tio);

17
miscutils/conspy.c
View File

@ -363,7 +363,6 @@ int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int conspy_main(int argc UNUSED_PARAM, char **argv)
{
char tty_name[sizeof(DEV_TTY "NN")];
struct termios termbuf;
unsigned opts;
unsigned ttynum;
int poll_timeout_ms;
@ -414,16 +413,14 @@ int conspy_main(int argc UNUSED_PARAM, char **argv)
bb_signals(BB_FATAL_SIGS, cleanup);
// All characters must be passed through to us unaltered
G.kbd_fd = xopen(CURRENT_TTY, O_RDONLY);
tcgetattr(G.kbd_fd, &G.term_orig);
termbuf = G.term_orig;
termbuf.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL);
//termbuf.c_oflag &= ~(OPOST); - no, we still want \n -> \r\n
termbuf.c_lflag &= ~(ISIG|ICANON|ECHO);
termbuf.c_cc[VMIN] = 1;
termbuf.c_cc[VTIME] = 0;
tcsetattr(G.kbd_fd, TCSANOW, &termbuf);
// All characters must be passed through to us unaltered
set_termios_to_raw(G.kbd_fd, &G.term_orig, 0
| TERMIOS_CLEAR_ISIG // no signals on ^C ^Z etc
| TERMIOS_RAW_INPUT // turn off all input conversions
);
//Note: termios.c_oflag &= ~(OPOST); - no, we still want \n -> \r\n
poll_timeout_ms = 250;
while (1) {

1
miscutils/microcom.c
View File

@ -33,6 +33,7 @@
// set raw tty mode
static void xget1(int fd, struct termios *t, struct termios *oldt)
{
//TODO: use set_termios_to_raw()
tcgetattr(fd, oldt);
*t = *oldt;
cfmakeraw(t);

1
miscutils/rx.c
View File

@ -263,6 +263,7 @@ int rx_main(int argc UNUSED_PARAM, char **argv)
termios_err = tcgetattr(read_fd, &tty);
if (termios_err == 0) {
//TODO: use set_termios_to_raw()
orig_tty = tty;
cfmakeraw(&tty);
tcsetattr(read_fd, TCSAFLUSH, &tty);

10
procps/powertop.c
View File

@ -683,7 +683,6 @@ int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
ullong cur_duration[MAX_CSTATE_COUNT];
char cstate_lines[MAX_CSTATE_COUNT + 2][64];
#if ENABLE_FEATURE_USE_TERMIOS
struct termios new_settings;
struct pollfd pfd[1];
pfd[0].fd = 0;
@ -707,14 +706,11 @@ int powertop_main(int UNUSED_PARAM argc, char UNUSED_PARAM **argv)
puts("Collecting data for "DEFAULT_SLEEP_STR" seconds");
#if ENABLE_FEATURE_USE_TERMIOS
tcgetattr(0, (void *)&G.init_settings);
memcpy(&new_settings, &G.init_settings, sizeof(new_settings));
/* Turn on unbuffered input, turn off echoing */
new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
/* Turn on unbuffered input; turn off echoing, ^C ^Z etc */
set_termios_to_raw(STDIN_FILENO, &G.init_settings, TERMIOS_CLEAR_ISIG);
bb_signals(BB_FATAL_SIGS, sig_handler);
/* So we don't forget to reset term settings */
atexit(reset_term);
bb_signals(BB_FATAL_SIGS, sig_handler);
tcsetattr_stdin_TCSANOW(&new_settings);
#endif
/* Collect initial data */

10
procps/top.c
View File

@ -1089,9 +1089,6 @@ int top_main(int argc UNUSED_PARAM, char **argv)
unsigned interval;
char *str_interval, *str_iterations;
unsigned scan_mask = TOP_MASK;
#if ENABLE_FEATURE_USE_TERMIOS
struct termios new_settings;
#endif
INIT_G();
@ -1141,11 +1138,8 @@ int top_main(int argc UNUSED_PARAM, char **argv)
}
#if ENABLE_FEATURE_USE_TERMIOS
else {
tcgetattr(0, (void *) &initial_settings);
memcpy(&new_settings, &initial_settings, sizeof(new_settings));
/* unbuffered input, turn off echo */
new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
tcsetattr_stdin_TCSANOW(&new_settings);
/* Turn on unbuffered input; turn off echoing, ^C ^Z etc */
set_termios_to_raw(STDIN_FILENO, &initial_settings, TERMIOS_CLEAR_ISIG);
}
bb_signals(BB_FATAL_SIGS, sig_catcher);

2
shell/shell_common.c
View File

@ -143,7 +143,7 @@ shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
// Setting it to more than 1 breaks poll():
// it blocks even if there's data. !??
//tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
/* reads would block only if < 1 char is available */
/* reads will block only if < 1 char is available */
tty.c_cc[VMIN] = 1;
/* no timeout (reads block forever) */
tty.c_cc[VTIME] = 0;

6
util-linux/fsck_minix.c
View File

@ -1226,7 +1226,6 @@ void check2(void);
int fsck_minix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fsck_minix_main(int argc UNUSED_PARAM, char **argv)
{
struct termios tmp;
int retcode = 0;
xfunc_error_retval = 8;
@ -1271,10 +1270,7 @@ int fsck_minix_main(int argc UNUSED_PARAM, char **argv)
read_tables();
if (OPT_manual) {
tcgetattr(0, &sv_termios);
tmp = sv_termios;
tmp.c_lflag &= ~(ICANON | ECHO);
tcsetattr_stdin_TCSANOW(&tmp);
set_termios_to_raw(STDIN_FILENO, &sv_termios, 0);
termios_set = 1;
}

10
util-linux/more.c
View File

@ -43,7 +43,6 @@ struct globals {
unsigned terminal_width;
unsigned terminal_height;
struct termios initial_settings;
struct termios new_settings;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { setup_common_bufsiz(); } while (0)
@ -101,12 +100,9 @@ int more_main(int argc UNUSED_PARAM, char **argv)
return bb_cat(argv);
G.tty_fileno = fileno(tty);
tcgetattr(G.tty_fileno, &G.initial_settings);
G.new_settings = G.initial_settings;
G.new_settings.c_lflag &= ~(ICANON | ECHO);
G.new_settings.c_cc[VMIN] = 1;
G.new_settings.c_cc[VTIME] = 0;
tcsetattr_tty_TCSANOW(&G.new_settings);
/* Turn on unbuffered input; turn off echoing */
set_termios_to_raw(G.tty_fileno, &G.initial_settings, 0);
bb_signals(BB_FATAL_SIGS, gotsig);
do {