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Diffstat (limited to 'languages/cpp/debugger/stty.cpp')
| -rw-r--r-- | languages/cpp/debugger/stty.cpp | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/languages/cpp/debugger/stty.cpp b/languages/cpp/debugger/stty.cpp new file mode 100644 index 00000000..f0bc2627 --- /dev/null +++ b/languages/cpp/debugger/stty.cpp @@ -0,0 +1,386 @@ +/*************************************************************************** + begin : Mon Sep 13 1999 + copyright : (C) 1999 by John Birch + email : jbb@kdevelop.org + + This code was originally written by Judin Maxim, from the + KDEStudio project. + + It was then updated with later code from konsole (KDE). + + It has also been enhanced with an idea from the code in kdbg + written by Johannes Sixt<Johannes.Sixt@telecom.at> + + ***************************************************************************/ + +/*************************************************************************** + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + ***************************************************************************/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#ifdef __osf__ +#define _XOPEN_SOURCE_EXTENDED +#define O_NDELAY O_NONBLOCK +#endif + +#include <sys/types.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <sys/time.h> +#include <sys/resource.h> + +#ifdef HAVE_SYS_STROPTS_H +#include <sys/stropts.h> +#define _NEW_TTY_CTRL +#endif + +#include <assert.h> +#include <fcntl.h> +#include <grp.h> +#include <stdio.h> +#include <stdlib.h> +#include <signal.h> +#include <termios.h> +#include <time.h> +#include <unistd.h> +#include <errno.h> + +#if defined (_HPUX_SOURCE) +#define _TERMIOS_INCLUDED +#include <bsdtty.h> +#endif + +#include <qintdict.h> +#include <qsocketnotifier.h> +#include <qstring.h> +#include <qfile.h> + +#include <klocale.h> +#include <kstandarddirs.h> +#include <kapplication.h> + +#include "stty.h" + +#define PTY_FILENO 3 +#define BASE_CHOWN "konsole_grantpty" + +namespace GDBDebugger +{ + +static int chownpty(int fd, int grant) +// param fd: the fd of a master pty. +// param grant: 1 to grant, 0 to revoke +// returns 1 on success 0 on fail +{ + void(*tmp)(int) = signal(SIGCHLD,SIG_DFL); + pid_t pid = fork(); + if (pid < 0) { + signal(SIGCHLD,tmp); + return 0; + } + if (pid == 0) { + /* We pass the master pseudo terminal as file descriptor PTY_FILENO. */ + if (fd != PTY_FILENO && dup2(fd, PTY_FILENO) < 0) + ::exit(1); + + QString path = locate("exe", BASE_CHOWN); + execle(QFile::encodeName(path), BASE_CHOWN, grant?"--grant":"--revoke", (void *)0, NULL); + ::exit(1); // should not be reached + } + if (pid > 0) { + int w; + // retry: + int rc = waitpid (pid, &w, 0); + if (rc != pid) + ::exit(1); + + // { // signal from other child, behave like catchChild. + // // guess this gives quite some control chaos... + // Shell* sh = shells.find(rc); + // if (sh) { shells.remove(rc); sh->doneShell(w); } + // goto retry; + // } + signal(SIGCHLD,tmp); + return (rc != -1 && WIFEXITED(w) && WEXITSTATUS(w) == 0); + } + signal(SIGCHLD,tmp); + return 0; //dummy. +} + +// ************************************************************************** + +STTY::STTY(bool ext, const QString &termAppName) + : QObject(), + out(0), + ttySlave(""), + pid_(0), + external_(ext) +{ + if (ext) { + findExternalTTY(termAppName); + } else { + fout = findTTY(); + if (fout >= 0) { + ttySlave = QString(tty_slave); + out = new QSocketNotifier(fout, QSocketNotifier::Read, this); + connect( out, SIGNAL(activated(int)), this, SLOT(OutReceived(int)) ); + } + } +} + +// ************************************************************************** + +STTY::~STTY() +{ + if (pid_) + ::kill(pid_, SIGTERM); + + if (out) { + ::close(fout); + delete out; + } +} + +// ************************************************************************** + +int STTY::findTTY() +{ + int ptyfd = -1; + bool needGrantPty = TRUE; + + // Find a master pty that we can open //////////////////////////////// + +#ifdef __sgi__ + ptyfd = open("/dev/ptmx",O_RDWR); + if (ptyfd < 0) { + perror("Can't open a pseudo teletype"); + return(-1); + } + strncpy(tty_slave, ptsname(ptyfd), 50); + grantpt(ptyfd); + unlockpt(ptyfd); + needGrantPty = FALSE; +#endif + + // first we try UNIX PTY's +#ifdef TIOCGPTN + strcpy(pty_master,"/dev/ptmx"); + strcpy(tty_slave,"/dev/pts/"); + ptyfd = open(pty_master,O_RDWR); + if (ptyfd >= 0) { // got the master pty + int ptyno; + if (ioctl(ptyfd, TIOCGPTN, &ptyno) == 0) { + struct stat sbuf; + sprintf(tty_slave,"/dev/pts/%d",ptyno); + if (stat(tty_slave,&sbuf) == 0 && S_ISCHR(sbuf.st_mode)) + needGrantPty = FALSE; + else { + close(ptyfd); + ptyfd = -1; + } + } else { + close(ptyfd); + ptyfd = -1; + } + } +#endif + +#if defined(_SCO_DS) || defined(__USLC__) /* SCO OSr5 and UnixWare */ + if (ptyfd < 0) { + for (int idx = 0; idx < 256; idx++) + { sprintf(pty_master, "/dev/ptyp%d", idx); + sprintf(tty_slave, "/dev/ttyp%d", idx); + if (access(tty_slave, F_OK) < 0) { idx = 256; break; } + if ((ptyfd = open (pty_master, O_RDWR)) >= 0) + { if (access (tty_slave, R_OK|W_OK) == 0) break; + close(ptyfd); ptyfd = -1; + } + } + } +#endif + if (ptyfd < 0) { /// \FIXME Linux, Trouble on other systems? + for (const char* s3 = "pqrstuvwxyzabcde"; *s3 != 0; s3++) { + for (const char* s4 = "0123456789abcdef"; *s4 != 0; s4++) { + sprintf(pty_master,"/dev/pty%c%c",*s3,*s4); + sprintf(tty_slave,"/dev/tty%c%c",*s3,*s4); + if ((ptyfd = open(pty_master, O_RDWR)) >= 0) { + if (geteuid() == 0 || access(tty_slave, R_OK|W_OK) == 0) + break; + + close(ptyfd); + ptyfd = -1; + } + } + + if (ptyfd >= 0) + break; + } + } + + if (ptyfd >= 0) { + if (needGrantPty && !chownpty(ptyfd, TRUE)) { + fprintf(stderr,"kdevelop: chownpty failed for device %s::%s.\n",pty_master,tty_slave); + fprintf(stderr," : This means the session can be eavesdroped.\n"); + fprintf(stderr," : Make sure konsole_grantpty is installed and setuid root.\n"); + } + + ::fcntl(ptyfd, F_SETFL, O_NDELAY); +#ifdef TIOCSPTLCK + int flag = 0; + ioctl(ptyfd, TIOCSPTLCK, &flag); // unlock pty +#endif + } + + return ptyfd; +} + +// ************************************************************************** + +void STTY::OutReceived(int f) +{ + char buf[1024]; + int n; + + // read until socket is empty. We shouldn't be receiving a continuous + // stream of data, so the loop is unlikely to cause problems. + while ((n = ::read(f, buf, sizeof(buf)-1)) > 0) { + *(buf+n) = 0; // a standard string + emit OutOutput(buf); + } + // Note: for some reason, n can be 0 here. + // I can understand that non-blocking read returns 0, + // but I don't understand how OutRecieved can be even + // called when there's no input. + if (n == 0 /* eof */ + || (n == -1 && errno != EAGAIN)) + { + // Found eof or error. Disable socket notifier, otherwise Qt + // will repeatedly call this method, eating CPU + // cycles. + out->setEnabled(false); + } + +} + +void STTY::readRemaining() +{ + if (!external_) + OutReceived(fout); +} + +// ************************************************************************** + +#define FIFO_FILE "/tmp/debug_tty.XXXXXX" + +bool STTY::findExternalTTY(const QString &termApp) +{ + QString appName(termApp.isEmpty() ? QString("xterm") : termApp); + + if ( KStandardDirs::findExe( termApp ).isEmpty() ) + { + return false; + } + + char fifo[] = FIFO_FILE; + int fifo_fd; + if ((fifo_fd = mkstemp(fifo)) == -1) + return false; + + ::close(fifo_fd); + ::unlink(fifo); + + // create a fifo that will pass in the tty name +#ifdef HAVE_MKFIFO + if (::mkfifo(fifo, S_IRUSR|S_IWUSR) < 0) +#else + if (::mknod(fifo, S_IFIFO | S_IRUSR|S_IWUSR, 0) < 0) +#endif + return false; + + int pid = ::fork(); + if (pid < 0) { // No process + ::unlink(fifo); + return false; + } + + if (pid == 0) { // child process + /* + * Spawn a console that in turn runs a shell script that passes us + * back the terminal name and then only sits and waits. + */ + + const char* prog = appName.latin1(); + QString script = QString("tty>") + QString(fifo) + + QString(";" // fifo name + "trap \"\" INT QUIT TSTP;" // ignore various signals + "exec<&-;exec>&-;" // close stdin and stdout + "while :;do sleep 3600;done"); + const char* scriptStr = script.latin1(); + const char* end = 0; + + if ( termApp == "konsole" ) + { + ::execlp( prog, prog, + "-caption", i18n("kdevelop: Debug application console").local8Bit().data(), + "-e", "sh", + "-c", scriptStr, + end); + } + else + { + ::execlp( prog, prog, + "-e", "sh", + "-c", scriptStr, + end); + } + + // Should not get here, as above should always work + ::exit(1); + } + + // parent process + if (pid <= 0) + ::exit(1); + + // Open the communication between us (the parent) and the + // child (the process running on a tty console) + fifo_fd = ::open(fifo, O_RDONLY); + if (fifo_fd < 0) + return false; + + // Get the ttyname from the fifo buffer that the child process + // has sent. + char ttyname[50]; + int n = ::read(fifo_fd, ttyname, sizeof(ttyname)-sizeof(char)); + + ::close(fifo_fd); + ::unlink(fifo); + + // No name?? + if (n <= 0) + return false; + + // remove whitespace + ttyname[n] = 0; + if (char* newline = strchr(ttyname, '\n')) + *newline = 0; // clobber the new line + + ttySlave = ttyname; + pid_ = pid; + + return true; +} + +} + +// ************************************************************************** +#include "stty.moc" |