diff options
Diffstat (limited to 'winsup/cygwin/fhandler_termios.cc')
| -rw-r--r-- | winsup/cygwin/fhandler_termios.cc | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/winsup/cygwin/fhandler_termios.cc b/winsup/cygwin/fhandler_termios.cc new file mode 100644 index 000000000..5c34178e6 --- /dev/null +++ b/winsup/cygwin/fhandler_termios.cc @@ -0,0 +1,293 @@ +/* fhandler_termios.cc + + Copyright 1996, 1997, 1998 Cygnus Solutions. + +This file is part of Cygwin. + +This software is a copyrighted work licensed under the terms of the +Cygwin license. Please consult the file "CYGWIN_LICENSE" for +details. */ + +#include <stdlib.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include "winsup.h" +#include <ctype.h> + +/* Common functions shared by tty/console */ + +void +fhandler_termios::tcinit (tty_min *this_tc, int force) +{ + /* Initial termios values */ + + tc = this_tc; + + if (force || !TTYISSETF (INITIALIZED)) + { + tc->ti.c_iflag = BRKINT | ICRNL | IXON; + tc->ti.c_oflag = OPOST | ONLCR; + tc->ti.c_cflag = B38400 | CS8 | CREAD; + tc->ti.c_lflag = ISIG | ICANON | ECHO | IEXTEN; + + tc->ti.c_cc[VDISCARD] = CFLUSH; + tc->ti.c_cc[VEOL] = CEOL; + tc->ti.c_cc[VEOL2] = CEOL2; + tc->ti.c_cc[VEOF] = CEOF; + tc->ti.c_cc[VERASE] = CERASE; + tc->ti.c_cc[VINTR] = CINTR; + tc->ti.c_cc[VKILL] = CKILL; + tc->ti.c_cc[VLNEXT] = CLNEXT; + tc->ti.c_cc[VMIN] = 1; + tc->ti.c_cc[VQUIT] = CQUIT; + tc->ti.c_cc[VREPRINT] = CRPRNT; + tc->ti.c_cc[VSTART] = CSTART; + tc->ti.c_cc[VSTOP] = CSTOP; + tc->ti.c_cc[VSUSP] = CSUSP; + tc->ti.c_cc[VSWTC] = CSWTCH; + tc->ti.c_cc[VTIME] = 0; + tc->ti.c_cc[VWERASE] = CWERASE; + + tc->ti.c_ispeed = tc->ti.c_ospeed = B38400; + tc->pgid = myself->pgid; + TTYSETF (INITIALIZED); + } +} + +int +fhandler_termios::tcsetpgrp (const pid_t pgid) +{ + termios_printf ("pgid %d, sid %d, tsid %d", pgid, + myself->sid, tc->getsid ()); + if (myself->sid != tc->getsid ()) + { + set_errno (EPERM); + return -1; + } + tc->setpgid (pgid); + return 0; +} + +int +fhandler_termios::tcgetpgrp () +{ + return tc->pgid; +} + +void +fhandler_termios::set_ctty (int ttynum, int flags) +{ + if ((myself->ctty < 0 || myself->ctty == ttynum) && !(flags & O_NOCTTY)) + { + myself->ctty = ttynum; + syscall_printf ("attached tty%d sid %d, pid %d, tty->pgid %d, tty->sid %d", + ttynum, myself->sid, myself->pid, tc->pgid, tc->getsid ()); + + pinfo *p = procinfo (tc->getsid ()); + if (myself->sid == myself->pid && + (p == myself || !proc_exists (p))) + { + paranoid_printf ("resetting tty%d sid. Was %d, now %d. pgid was %d, now %d.", + ttynum, tc->getsid(), myself->sid, tc->getpgid (), myself->pgid); + /* We are the session leader */ + tc->setsid (myself->sid); + tc->setpgid (myself->pgid); + } + else + myself->sid = tc->getsid (); + if (tc->getpgid () == 0) + tc->setpgid (myself->pgid); + } +} + +int +fhandler_termios::bg_check (int sig, int blocksigs) +{ + if (!myself->pgid || tc->getpgid () == myself->pgid || + myself->ctty != tc->ntty || + ((sig == SIGTTOU) && !(tc->ti.c_lflag & TOSTOP))) + return 1; + + if (sig < 0) + sig = -sig; + + termios_printf("bg I/O pgid %d, tpgid %d, ctty %d", + myself->pgid, tc->getpgid (), myself->ctty); + + if (tc->getsid () == 0) + { + /* The pty has been closed by the master. Return an EOF + indication. FIXME: There is nothing to stop somebody + from reallocating this pty. I think this is the case + which is handled by unlockpt on a Unix system. */ + termios_printf ("closed by master"); + return 0; + } + + /* If the process group is no more or if process is ignoring or blocks 'sig', + return with error */ + int pgid_gone = !proc_exists (procinfo (myself->pgid)); + int sigs_ignored = + ((void *) myself->getsig(sig).sa_handler == (void *) SIG_IGN) || + (myself->getsigmask () & SIGTOMASK (sig)); + + if (pgid_gone) + goto setEIO; + else if (!sigs_ignored) + /* nothing */; + else if (sig == SIGTTOU) + return 1; /* Just allow the output */ + else + goto setEIO; /* This is an output error */ + + _raise (sig); + return 1; + +setEIO: + set_errno (EIO); + return -1; +} + +#define set_input_done(x) input_done = input_done || (x) + +int +fhandler_termios::line_edit (const char *rptr, int nread, int always_accept) +{ + char c; + int input_done = 0; + int iscanon = tc->ti.c_lflag & ICANON; + + while (nread-- > 0) + { + c = *rptr++; + + termios_printf ("char %c", c); + + /* Check for special chars */ + + if (c == '\r') + { + if (tc->ti.c_iflag & IGNCR) + continue; + if (tc->ti.c_iflag & ICRNL) + { + c = '\n'; + set_input_done (iscanon); + } + } + else if (c == '\n') + { + if (tc->ti.c_iflag & INLCR) + c = '\r'; + else + set_input_done (iscanon); + } + + if (tc->ti.c_iflag & ISTRIP) + c &= 0x7f; + if (tc->ti.c_lflag & ISIG) + { + int sig; + if (c == tc->ti.c_cc[VINTR]) + sig = SIGINT; + else if (c == tc->ti.c_cc[VQUIT]) + sig = SIGQUIT; + else if (c == tc->ti.c_cc[VSUSP]) + sig = SIGTSTP; + else + goto not_a_sig; + + termios_printf ("got interrupt %d, sending signal %d", c, sig); + kill_pgrp (tc->getpgid (), sig); + tc->ti.c_lflag &= ~FLUSHO; + goto restart_output; + } + not_a_sig: + if (tc->ti.c_iflag & IXON) + { + if (c == tc->ti.c_cc[VSTOP]) + { + tc->OutputStopped++; + continue; + } + else if (c == tc->ti.c_cc[VSTART]) + { + restart_output: + tc->OutputStopped = 0; + SetEvent (restart_output_event); + continue; + } + else if ((tc->ti.c_iflag & IXANY) && tc->OutputStopped) + goto restart_output; + } + if (tc->ti.c_lflag & IEXTEN && c == tc->ti.c_cc[VDISCARD]) + { + tc->ti.c_lflag ^= FLUSHO; + continue; + } + if (!iscanon) + /* nothing */; + else if (c == tc->ti.c_cc[VERASE]) + { + if (eat_readahead (1)) + doecho ("\b \b", 3); + continue; + } + else if (c == tc->ti.c_cc[VWERASE]) + { + int ch; + do + if (!eat_readahead (1)) + break; + else + doecho ("\b \b", 3); + while ((ch = peek_readahead (1)) >= 0 && !isspace (ch)); + continue; + } + else if (c == tc->ti.c_cc[VKILL]) + { + int nchars = eat_readahead (-1); + while (nchars--) + doecho ("\b \b", 3); + continue; + } + else if (c == tc->ti.c_cc[VREPRINT]) + { + doecho ("\n\r", 2); + doecho (rabuf, ralen); + continue; + } + else if (c == tc->ti.c_cc[VEOF]) + { + termios_printf ("EOF"); + input_done = 1; + continue; + } + else if (c == tc->ti.c_cc[VEOL] || + c == tc->ti.c_cc[VEOL2] || + c == '\n') + { + set_input_done (1); + termios_printf ("EOL"); + } + + if (tc->ti.c_iflag & IUCLC && isupper (c)) + c = tolower (c); + + if (tc->ti.c_lflag & ECHO) + doecho (&c, 1); + put_readahead (c); + } + + if (!iscanon || always_accept) + set_input_done (ralen > 0); + + /* FIXME: It's not clear that this code will ever do anything. + Currently, it doesn't look like accept_input will ever return + a negative number. */ + if (input_done) + (void) accept_input (); + + return input_done; +} |