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-rw-r--r--apt-pkg/deb/dpkgpm.cc16
1 files changed, 12 insertions, 4 deletions
diff --git a/apt-pkg/deb/dpkgpm.cc b/apt-pkg/deb/dpkgpm.cc
index 85cf4e119..36c20ad85 100644
--- a/apt-pkg/deb/dpkgpm.cc
+++ b/apt-pkg/deb/dpkgpm.cc
@@ -587,6 +587,11 @@ static int racy_pselect(int nfds, fd_set *readfds, fd_set *writefds,
*/
bool pkgDPkgPM::Go(int OutStatusFd)
{
+ fd_set rfds;
+ struct timespec tv;
+ sigset_t sigmask;
+ sigset_t original_sigmask;
+
unsigned int MaxArgs = _config->FindI("Dpkg::MaxArgs",8*1024);
unsigned int MaxArgBytes = _config->FindI("Dpkg::MaxArgBytes",32*1024);
bool NoTriggers = _config->FindB("DPkg::NoTriggers",false);
@@ -795,7 +800,14 @@ bool pkgDPkgPM::Go(int OutStatusFd)
rtt = tt;
cfmakeraw(&rtt);
rtt.c_lflag &= ~ECHO;
+ // 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(&sigmask);
+ sigaddset(&sigmask, SIGTTOU);
+ sigprocmask(SIG_BLOCK,&sigmask, &original_sigmask);
tcsetattr(0, TCSAFLUSH, &rtt);
+ sigprocmask(SIG_SETMASK, &original_sigmask, 0);
}
// Fork dpkg
@@ -862,10 +874,6 @@ bool pkgDPkgPM::Go(int OutStatusFd)
close(slave);
// setups fds
- fd_set rfds;
- struct timespec tv;
- sigset_t sigmask;
- sigset_t original_sigmask;
sigemptyset(&sigmask);
sigprocmask(SIG_BLOCK,&sigmask,&original_sigmask);