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authorDavid Kalnischkies <david@kalnischkies.de>2014-09-08 21:05:11 +0200
committerDavid Kalnischkies <david@kalnischkies.de>2014-09-08 21:05:11 +0200
commit223ae57d468fdcac451209a095047a07a5698212 (patch)
tree33ffbc3175d3950f04b50025e6338d244ad40672 /apt-pkg
parent4c559e97ba4cc0d3a2995b7c451e606539d2f1be (diff)
rework PTY magic to fix stair-stepping on kfreebsd
A pty slave we have got from openpty can only be used for one dpkg child, if we give it to a second child on kfreebsd setting TIOCSCTTY fails causing the output to be stair-stepped from now on. By switching the code to creating a master and opening a new slave in the child for each child we can fix this glitch, so that at least the master remains stable. Closes: 759684
Diffstat (limited to 'apt-pkg')
-rw-r--r--apt-pkg/deb/dpkgpm.cc159
-rw-r--r--apt-pkg/deb/dpkgpm.h1
2 files changed, 107 insertions, 53 deletions
diff --git a/apt-pkg/deb/dpkgpm.cc b/apt-pkg/deb/dpkgpm.cc
index 5411d9ee8..04a13a86c 100644
--- a/apt-pkg/deb/dpkgpm.cc
+++ b/apt-pkg/deb/dpkgpm.cc
@@ -59,8 +59,8 @@ class pkgDPkgPMPrivate
{
public:
pkgDPkgPMPrivate() : stdin_is_dev_null(false), dpkgbuf_pos(0),
- term_out(NULL), history_out(NULL),
- progress(NULL), master(-1), slave(-1)
+ term_out(NULL), history_out(NULL),
+ progress(NULL), master(-1), slave(NULL)
{
dpkgbuf[0] = '\0';
}
@@ -77,9 +77,9 @@ public:
APT::Progress::PackageManager *progress;
// pty stuff
- struct termios tt;
+ struct termios tt;
int master;
- int slave;
+ char * slave;
// signals
sigset_t sigmask;
@@ -510,7 +510,7 @@ bool pkgDPkgPM::RunScriptsWithPkgs(const char *Cnf)
return result;
}
/*}}}*/
-// DPkgPM::DoStdin - Read stdin and pass to slave pty /*{{{*/
+// DPkgPM::DoStdin - Read stdin and pass to master pty /*{{{*/
// ---------------------------------------------------------------------
/*
*/
@@ -1051,60 +1051,127 @@ void pkgDPkgPM::StartPtyMagic()
{
if (_config->FindB("Dpkg::Use-Pty", true) == false)
{
- d->master = d->slave = -1;
+ d->master = -1;
+ if (d->slave != NULL)
+ free(d->slave);
+ d->slave = NULL;
return;
}
- // setup the pty and stuff
- struct winsize win;
-
+ _error->PushToStack();
// if tcgetattr for both stdin/stdout returns 0 (no error)
// we do the pty magic
- _error->PushToStack();
- if (tcgetattr(STDIN_FILENO, &d->tt) == 0 &&
- tcgetattr(STDOUT_FILENO, &d->tt) == 0)
+ if (tcgetattr(STDOUT_FILENO, &d->tt) == 0 &&
+ tcgetattr(STDIN_FILENO, &d->tt) == 0)
{
- if (ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&win) < 0)
- {
- _error->Errno("ioctl", _("ioctl(TIOCGWINSZ) failed"));
- } else if (openpty(&d->master, &d->slave, NULL, &d->tt, &win) < 0)
- {
- _error->Errno("openpty", _("Can not write log (%s)"), _("Is /dev/pts mounted?"));
- d->master = d->slave = -1;
- } else {
- struct termios rtt;
- rtt = d->tt;
- cfmakeraw(&rtt);
- rtt.c_lflag &= ~ECHO;
- rtt.c_lflag |= ISIG;
+ d->master = posix_openpt(O_RDWR | O_NOCTTY);
+ if (d->master == -1)
+ _error->Errno("posix_openpt", _("Can not write log (%s)"), _("Is /dev/pts mounted?"));
+ else if (unlockpt(d->master) == -1)
+ {
+ _error->Errno("unlockpt", "Unlocking the slave of master fd %d failed!", d->master);
+ close(d->master);
+ d->master = -1;
+ }
+ else
+ {
+ char const * const slave_name = ptsname(d->master);
+ if (slave_name == NULL)
+ {
+ _error->Errno("unlockpt", "Getting name for slave of master fd %d failed!", d->master);
+ close(d->master);
+ d->master = -1;
+ }
+ else
+ {
+ d->slave = strdup(slave_name);
+ if (d->slave == NULL)
+ {
+ _error->Errno("strdup", "Copying name %s for slave of master fd %d failed!", slave_name, d->master);
+ close(d->master);
+ d->master = -1;
+ }
+ struct winsize win;
+ if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) < 0)
+ _error->Errno("ioctl", "Getting TIOCGWINSZ from stdout failed!");
+ if (ioctl(d->master, TIOCSWINSZ, &win) < 0)
+ _error->Errno("ioctl", "Setting TIOCSWINSZ for master fd %d failed!", d->master);
+ if (tcsetattr(d->master, TCSANOW, &d->tt) == -1)
+ _error->Errno("tcsetattr", "Setting in Start via TCSANOW for master fd %d failed!", d->master);
+
+ struct termios raw_tt;
+ raw_tt = d->tt;
+ cfmakeraw(&raw_tt);
+ raw_tt.c_lflag &= ~ECHO;
+ raw_tt.c_lflag |= ISIG;
// block SIGTTOU during tcsetattr to prevent a hang if
// the process is a member of the background process group
// http://www.opengroup.org/onlinepubs/000095399/functions/tcsetattr.html
sigemptyset(&d->sigmask);
sigaddset(&d->sigmask, SIGTTOU);
sigprocmask(SIG_BLOCK,&d->sigmask, &d->original_sigmask);
- tcsetattr(0, TCSAFLUSH, &rtt);
- sigprocmask(SIG_SETMASK, &d->original_sigmask, 0);
- }
+ if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_tt) == -1)
+ _error->Errno("tcsetattr", "Setting in Start via TCSAFLUSH for stdout failed!");
+ sigprocmask(SIG_SETMASK, &d->original_sigmask, NULL);
+ }
}
- // complain only if stdout is either a terminal (but still failed) or is an invalid
+ }
+ else
+ {
+ // complain only if stdout is either a terminal (but still failed) or is an invalid
// descriptor otherwise we would complain about redirection to e.g. /dev/null as well.
- else if (isatty(STDOUT_FILENO) == 1 || errno == EBADF)
- _error->Errno("tcgetattr", _("Can not write log (%s)"), _("Is stdout a terminal?"));
+ if (isatty(STDOUT_FILENO) == 1 || errno == EBADF)
+ _error->Errno("tcgetattr", _("Can not write log (%s)"), _("Is stdout a terminal?"));
+ }
- if (_error->PendingError() == true)
- _error->DumpErrors(std::cerr);
- _error->RevertToStack();
+ if (_error->PendingError() == true)
+ {
+ if (d->master != -1)
+ {
+ close(d->master);
+ d->master = -1;
+ }
+ _error->DumpErrors(std::cerr);
+ }
+ _error->RevertToStack();
}
+void pkgDPkgPM::SetupSlavePtyMagic()
+{
+ if(d->master == -1)
+ return;
+
+ if (close(d->master) == -1)
+ _error->FatalE("close", "Closing master %d in child failed!", d->master);
+ if (setsid() == -1)
+ _error->FatalE("setsid", "Starting a new session for child failed!");
+
+ int const slaveFd = open(d->slave, O_RDWR);
+ if (slaveFd == -1)
+ _error->FatalE("open", _("Can not write log (%s)"), _("Is /dev/pts mounted?"));
+ if (ioctl(slaveFd, TIOCSCTTY, 0) < 0)
+ _error->FatalE("ioctl", "Setting TIOCSCTTY for slave fd %d failed!", slaveFd);
+ else
+ {
+ for (unsigned short i = 0; i < 3; ++i)
+ if (dup2(slaveFd, i) == -1)
+ _error->FatalE("dup2", "Dupping %d to %d in child failed!", slaveFd, i);
+
+ if (tcsetattr(0, TCSANOW, &d->tt) < 0)
+ _error->FatalE("tcsetattr", "Setting in Setup via TCSANOW for slave fd %d failed!", slaveFd);
+ }
+}
void pkgDPkgPM::StopPtyMagic()
{
- if(d->slave > 0)
- close(d->slave);
+ if (d->slave != NULL)
+ free(d->slave);
+ d->slave = NULL;
if(d->master >= 0)
{
- tcsetattr(0, TCSAFLUSH, &d->tt);
+ if (tcsetattr(0, TCSAFLUSH, &d->tt) == -1)
+ _error->FatalE("tcsetattr", "Setting in Stop via TCSAFLUSH for stdin failed!");
close(d->master);
+ d->master = -1;
}
}
@@ -1416,22 +1483,8 @@ bool pkgDPkgPM::GoNoABIBreak(APT::Progress::PackageManager *progress)
pid_t Child = ExecFork(KeepFDs);
if (Child == 0)
{
- // This is the child
- if(d->slave >= 0 && d->master >= 0)
- {
- setsid();
- int res = ioctl(d->slave, TIOCSCTTY, 0);
- if (res < 0) {
- std::cerr << "ioctl(TIOCSCTTY) failed for fd: "
- << d->slave << std::endl;
- } else {
- close(d->master);
- dup2(d->slave, 0);
- dup2(d->slave, 1);
- dup2(d->slave, 2);
- close(d->slave);
- }
- }
+ // This is the child
+ SetupSlavePtyMagic();
close(fd[0]); // close the read end of the pipe
dpkgChrootDirectory();
diff --git a/apt-pkg/deb/dpkgpm.h b/apt-pkg/deb/dpkgpm.h
index 859c74b46..2c1805015 100644
--- a/apt-pkg/deb/dpkgpm.h
+++ b/apt-pkg/deb/dpkgpm.h
@@ -110,6 +110,7 @@ class pkgDPkgPM : public pkgPackageManager
// helper
void BuildPackagesProgressMap();
void StartPtyMagic();
+ void SetupSlavePtyMagic();
void StopPtyMagic();
// input processing