3ff9be31b
Denys Vlasenko
2011-01-26
Subject
getty: document bits we don't set - maybe we should set some of them?
Binary
No binary (build failed)
Architecture & Compiler Flags
—
Build Log
(log yok)
Commit Diff GitHub →
loginutils/getty.c+59 -7
| @@ -264,10 +264,17 @@ static void termios_init(int speed) | |
| if (option_mask32 & F_RTSCTS) | |
| G.termios.c_cflag |= CRTSCTS; /* flow control using RTS/CTS pins */ | |
| #endif | |
| + | /* Other bits in c_cflag: |
| + | * CSTOPB 2 stop bits (1 otherwise) |
| + | * PARENB Enable parity bit |
| + | * PARODD Use odd parity (else even) |
| + | * LOBLK Block job control output (??) |
| + | */ |
| G.termios.c_iflag = 0; | |
| G.termios.c_lflag = 0; | |
| /* non-raw output; add CR to each NL */ | |
| G.termios.c_oflag = OPOST | ONLCR; | |
| + | |
| G.termios.c_cc[VMIN] = 1; /* block reads if < 1 char is available */ | |
| G.termios.c_cc[VTIME] = 0; /* no timeout (reads block forever) */ | |
| #ifdef __linux__ | |
| @@ -281,18 +288,55 @@ static void termios_init(int speed) | |
| static void termios_final(void) | |
| { | |
| - | /* software flow control on output; and on input */ |
| + | /* software flow control on output (stop sending if XOFF is recvd); |
| + | * and on input (send XOFF when buffer is full) |
| + | */ |
| G.termios.c_iflag |= IXON | IXOFF; | |
| if (G.eol == '\r') { | |
| G.termios.c_iflag |= ICRNL; /* map CR on input to NL */ | |
| } | |
| - | /* non-raw input; enable SIGINT/QUIT/etc sigs; echo; |
| - | * echo erase character as BS-space-BS; |
| - | * echo NL on kill char; |
| - | * erase entire line via BS-space-BS on kill char */ |
| + | /* Other bits in c_iflag: |
| + | * IXANY Any recvd char enables output (any char is also a XON) |
| + | * INPCK Enable parity check |
| + | * IGNPAR Ignore parity errors (drop bad bytes) |
| + | * PARMRK Mark parity errors with 0xff, 0x00 prefix |
| + | * (else bad byte is received as 0x00) |
| + | * ISTRIP Strip parity bit |
| + | * IGNBRK Ignore break condition |
| + | * BRKINT Send SIGINT on break - maybe set this? |
| + | * INLCR Map NL to CR |
| + | * IGNCR Ignore CR |
| + | * ICRNL Map CR to NL |
| + | * IUCLC Map uppercase to lowercase |
| + | * IMAXBEL Echo BEL on input line too long |
| + | * IUTF8 [Appears to affect tty's idea of char widths, |
| + | * observed to improve backspacing through Unicode chars] |
| + | */ |
| + | |
| + | /* line buffered input (NL or EOL or EOF chars end a line); |
| + | * recognize INT/QUIT/SUSP chars; |
| + | * echo input chars; |
| + | * echo BS-SP-BS on erase character; |
| + | * echo kill char specially, not as ^c (ECHOKE controls how exactly); |
| + | * erase all input via BS-SP-BS on kill char (else go to next line) |
| + | */ |
| G.termios.c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE; | |
| - | /* echo ctrl chars as ^c; (what is ECHOPRT?) */ |
| - | /* no longer in c_lflag: | ECHOCTL | ECHOPRT */ |
| + | /* Other bits in c_lflag: |
| + | * XCASE Map uppercase to \lowercase [tried, doesn't work] |
| + | * ECHONL Echo NL even if ECHO is not set |
| + | * NOFLSH Don't flush input buffer after interrupt or quit chars |
| + | * IEXTEN Enable extended functions (??) |
| + | * [glibc says it enables c_cc[LNEXT] "enter literal char" |
| + | * and c_cc[VDISCARD] "toggle discard buffered output" chars] |
| + | * ECHOCTL Echo ctrl chars as ^c (else don't echo) - maybe set this? |
| + | * ECHOPRT On erase, echo erased chars |
| + | * [qwe<BS><BS><BS> input looks like "qwe\ewq/" on screen] |
| + | * FLUSHO Output being flushed (c_cc[VDISCARD] is in effect) |
| + | * PENDIN Retype pending input at next read or input char |
| + | * (c_cc[VREPRINT] is being processes) |
| + | * TOSTOP Send SIGTTOU for background output |
| + | * (why "stty sane" unsets this bit?) |
| + | */ |
| G.termios.c_cc[VINTR] = DEF_INTR; | |
| G.termios.c_cc[VQUIT] = DEF_QUIT; | |
| @@ -305,6 +349,14 @@ static void termios_final(void) | |
| G.termios.c_cc[VSWTCH] = DEF_SWITCH; | |
| #endif | |
| G.termios.c_cc[VKILL] = DEF_KILL; | |
| + | /* Other control chars: |
| + | * VEOL2 |
| + | * VERASE, VWERASE - (word) erase. we may set VERASE in get_logname |
| + | * VREPRINT - reprint current input buffer |
| + | * VLNEXT, VDISCARD, VSTATUS |
| + | * VSUSP, VDSUSP - send (delayed) SIGTSTP |
| + | * VSTART, VSTOP - chars used for IXON/IXOFF |
| + | */ |
| if (tcsetattr_stdin_TCSANOW(&G.termios) < 0) | |
| bb_perror_msg_and_die("tcsetattr"); | |