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NPTL: Conditionalize more uses of SIGCANCEL and SIGSETXID.
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ChangeLog
11
ChangeLog
@ -1,5 +1,16 @@
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2014-10-17 Roland McGrath <roland@hack.frob.com>
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* nptl/nptl-init.c (sighandler_setxid, __xidcmd): Make definitions
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conditional on [SIGSETXID].
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(sigcancel_handler): Make definition conditional on [SIGCANCEL].
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(__pthread_initialize_minimal_internal): Set up SIGCANCEL only if it
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is defined. Likewise for SIGSETXID.
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* nptl/allocatestack.c (setxid_mark_thread, setxid_unmark_thread):
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Conditionalize definitions on [SIGSETXID].
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(setxid_signal_thread, __nptl_setxid_error, __nptl_setxid): Likewise.
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* nptl/pthread_create.c (start_thread): Conditionalize SIGCANCEL
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unblocking on [SIGCANCEL].
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* nptl/nptl-init.c (__nptl_set_robust): Conditionalize body on
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[__NR_set_robust_list].
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@ -978,6 +978,7 @@ __find_thread_by_id (pid_t tid)
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#endif
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#ifdef SIGSETXID
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static void
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internal_function
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setxid_mark_thread (struct xid_command *cmdp, struct pthread *t)
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@ -1185,6 +1186,8 @@ __nptl_setxid (struct xid_command *cmdp)
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lll_unlock (stack_cache_lock, LLL_PRIVATE);
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return result;
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}
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#endif /* SIGSETXID. */
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static inline void __attribute__((always_inline))
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init_one_static_tls (struct pthread *curp, struct link_map *map)
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@ -170,6 +170,7 @@ __nptl_set_robust (struct pthread *self)
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}
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#ifdef SIGCANCEL
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/* For asynchronous cancellation we use a signal. This is the handler. */
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static void
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sigcancel_handler (int sig, siginfo_t *si, void *ctx)
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@ -221,8 +222,10 @@ sigcancel_handler (int sig, siginfo_t *si, void *ctx)
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oldval = curval;
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}
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}
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#endif
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#ifdef SIGSETXID
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struct xid_command *__xidcmd attribute_hidden;
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/* We use the SIGSETXID signal in the setuid, setgid, etc. implementations to
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@ -273,6 +276,7 @@ sighandler_setxid (int sig, siginfo_t *si, void *ctx)
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if (atomic_decrement_val (&__xidcmd->cntr) == 0)
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lll_futex_wake (&__xidcmd->cntr, 1, LLL_PRIVATE);
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}
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#endif
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/* When using __thread for this, we do it in libc so as not
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@ -372,29 +376,38 @@ __pthread_initialize_minimal_internal (void)
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had to set __nptl_initial_report_events. Propagate its setting. */
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THREAD_SETMEM (pd, report_events, __nptl_initial_report_events);
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#if defined SIGCANCEL || defined SIGSETXID
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struct sigaction sa;
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__sigemptyset (&sa.sa_mask);
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# ifdef SIGCANCEL
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/* Install the cancellation signal handler. If for some reason we
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cannot install the handler we do not abort. Maybe we should, but
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it is only asynchronous cancellation which is affected. */
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struct sigaction sa;
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sa.sa_sigaction = sigcancel_handler;
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sa.sa_flags = SA_SIGINFO;
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__sigemptyset (&sa.sa_mask);
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(void) __libc_sigaction (SIGCANCEL, &sa, NULL);
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# endif
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# ifdef SIGSETXID
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/* Install the handle to change the threads' uid/gid. */
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sa.sa_sigaction = sighandler_setxid;
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sa.sa_flags = SA_SIGINFO | SA_RESTART;
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(void) __libc_sigaction (SIGSETXID, &sa, NULL);
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# endif
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/* The parent process might have left the signals blocked. Just in
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case, unblock it. We reuse the signal mask in the sigaction
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structure. It is already cleared. */
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# ifdef SIGCANCEL
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__sigaddset (&sa.sa_mask, SIGCANCEL);
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# endif
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# ifdef SIGSETXID
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__sigaddset (&sa.sa_mask, SIGSETXID);
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# endif
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(void) INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_UNBLOCK, &sa.sa_mask,
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NULL, _NSIG / 8);
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#endif
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/* Get the size of the static and alignment requirements for the TLS
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block. */
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@ -263,6 +263,7 @@ start_thread (void *arg)
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}
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#endif
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#ifdef SIGCANCEL
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/* If the parent was running cancellation handlers while creating
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the thread the new thread inherited the signal mask. Reset the
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cancellation signal mask. */
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@ -275,6 +276,7 @@ start_thread (void *arg)
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(void) INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_UNBLOCK, &mask,
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NULL, _NSIG / 8);
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}
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#endif
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/* This is where the try/finally block should be created. For
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compilers without that support we do use setjmp. */
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