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linux: place alternate signal stack in stack area

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The alternate stack must use the stack area as, e.g., Thread::myself()
depends on this property. Hybrid components do not depend on this
property and, therefore, use a static stack buffer.

Fixes #1935
This commit is contained in:
Christian Helmuth
2016-06-22 16:14:18 +02:00
parent d8c34237bf
commit d7ddc83fa9
6 changed files with 36 additions and 23 deletions
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6
repos/base-linux/src/lib/lx_hybrid/lx_hybrid.cc
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@ -71,7 +71,7 @@ __attribute__((constructor(101))) void lx_hybrid_init()
* Set signal handler such that canceled system calls get not
* transparently retried after a signal gets received.
*/
lx_sigaction(LX_SIGUSR1, empty_signal_handler);
lx_sigaction(LX_SIGUSR1, empty_signal_handler, false);
}
namespace Genode {
@ -345,12 +345,12 @@ static void adopt_thread(Native_thread::Meta_data *meta_data)
* Set signal handler such that canceled system calls get not
* transparently retried after a signal gets received.
*/
lx_sigaction(LX_SIGUSR1, empty_signal_handler);
lx_sigaction(LX_SIGUSR1, empty_signal_handler, false);
/*
* Prevent children from becoming zombies. (SIG_IGN = 1)
*/
lx_sigaction(LX_SIGCHLD, (void (*)(int))1);
lx_sigaction(LX_SIGCHLD, (void (*)(int))1, false);
/* assign 'Native_thread::Meta_data' pointer to TLS entry */
pthread_setspecific(tls_key(), meta_data);