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authorRich Felker <dalias@aerifal.cx>2013-03-31 23:25:55 -0400
committerRich Felker <dalias@aerifal.cx>2013-03-31 23:25:55 -0400
commit14a835b3868e4dccece15acbff6d5da6c0e1ff17 (patch)
tree38dc322f8c4465d39c467009824d525e0712af56 /src/thread/pthread_getattr_np.c
parentccc7b4c3a17ade90de71e1e0f44deebbffd646e6 (diff)
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implement pthread_getattr_np
this function is mainly (purely?) for obtaining stack address information, but we also provide the detach state since it's easy to do anyway.
Diffstat (limited to 'src/thread/pthread_getattr_np.c')
-rw-r--r--src/thread/pthread_getattr_np.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/thread/pthread_getattr_np.c b/src/thread/pthread_getattr_np.c
new file mode 100644
index 00000000..945242b7
--- /dev/null
+++ b/src/thread/pthread_getattr_np.c
@@ -0,0 +1,21 @@
+#include "pthread_impl.h"
+#include <sys/mman.h>
+
+int pthread_getattr_np(pthread_t t, pthread_attr_t *a)
+{
+ *a = (pthread_attr_t){0};
+ a->_a_detach = !!t->detached;
+ if (t->stack) {
+ a->_a_stackaddr = (uintptr_t)t->stack;
+ a->_a_stacksize = t->stack_size - DEFAULT_STACK_SIZE;
+ } else {
+ char *p = (void *)libc.auxv;
+ size_t l = PAGE_SIZE;
+ p += -(uintptr_t)p & PAGE_SIZE-1;
+ a->_a_stackaddr = (uintptr_t)p;
+ while (!posix_madvise(p-l-PAGE_SIZE, PAGE_SIZE, POSIX_MADV_NORMAL))
+ l += PAGE_SIZE;
+ a->_a_stacksize = l - DEFAULT_STACK_SIZE;
+ }
+ return 0;
+}