http://bugs.gentoo.org/231775 http://lists.gnu.org/archive/html/bug-bash/2008-07/msg00010.html A parent bash shell sometimes will set the session leader tty (using tcsetpgrp) back to itself, taking control away from a child bash shell, due to a race condition. A result is that the child can then not then execute some commands (like stty) from its init script (e.g. .bashrc). The result I (and others) have seen is that the bash shell will hang while reading the init script. *** jobs.c.20080704 2008-07-10 15:14:13.000000000 -0400 --- jobs.c 2008-07-10 15:17:59.000000000 -0400 *************** *** 266,269 **** --- 266,270 ---- static void set_job_running __P((int)); static void setjstatus __P((int)); + static int maybe_give_terminal_to __P((pid_t, pid_t, int)); static void mark_all_jobs_as_dead __P((void)); static void mark_dead_jobs_as_notified __P((int)); *************** *** 637,641 **** */ if (job_control && newjob->pgrp && (subshell_environment&SUBSHELL_ASYNC) == 0) ! give_terminal_to (newjob->pgrp, 0); } } --- 638,642 ---- */ if (job_control && newjob->pgrp && (subshell_environment&SUBSHELL_ASYNC) == 0) ! maybe_give_terminal_to (shell_pgrp, newjob->pgrp, 0); } } *************** *** 3833,3836 **** --- 3834,3863 ---- } + /* Give terminal to NPGRP iff it's currently owned by OPGRP. FLAGS are the + flags to pass to give_terminal_to(). */ + static int + maybe_give_terminal_to (opgrp, npgrp, flags) + pid_t opgrp, npgrp; + int flags; + { + int tpgrp; + + tpgrp = tcgetpgrp (shell_tty); + if (tpgrp == npgrp) + { + terminal_pgrp = npgrp; + return 0; + } + else if (tpgrp != opgrp) + { + #if defined (DEBUG) + internal_warning ("maybe_give_terminal_to: terminal pgrp == %d shell pgrp = %d", tpgrp, opgrp); + #endif + return -1; + } + else + return (give_terminal_to (npgrp, flags)); + } + /* Clear out any jobs in the job array. This is intended to be used by children of the shell, who should not have any job structures as baggage