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--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -858,9 +858,6 @@
# define MAINSTACKADDR_AVAILABLE 0
# endif
#endif
-#if MAINSTACKADDR_AVAILABLE && !defined(get_main_stack)
-# define get_main_stack(addr, size) get_stack(addr, size)
-#endif
#ifdef STACKADDR_AVAILABLE
/*
@@ -942,6 +939,55 @@
return 0;
#undef CHECK_ERR
}
+
+#if defined(__linux__) && !defined(__GLIBC__) && defined(HAVE_GETRLIMIT)
+
+#ifndef PAGE_SIZE
+#include <unistd.h>
+#define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
+#endif
+
+static int
+get_main_stack(void **addr, size_t *size)
+{
+ size_t start, end, limit, prevend = 0;
+ struct rlimit r;
+ FILE *f;
+ char buf[PATH_MAX+80], s[8];
+ int n;
+ STACK_GROW_DIR_DETECTION;
+
+ f = fopen("/proc/self/maps", "re");
+ if (!f)
+ return -1;
+ n = 0;
+ while (fgets(buf, sizeof buf, f)) {
+ n = sscanf(buf, "%zx-%zx %*s %*s %*s %*s %7s", &start, &end, s);
+ if (n >= 2) {
+ if (n == 3 && strcmp(s, "[stack]") == 0)
+ break;
+ prevend = end;
+ }
+ n = 0;
+ }
+ fclose(f);
+ if (n == 0)
+ return -1;
+
+ limit = 100 << 20; /* 100MB stack limit */
+ if (getrlimit(RLIMIT_STACK, &r)==0 && r.rlim_cur < limit)
+ limit = r.rlim_cur & -PAGE_SIZE;
+ if (limit > end) limit = end;
+ if (prevend < end - limit) prevend = end - limit;
+ if (start > prevend) start = prevend;
+ *addr = IS_STACK_DIR_UPPER() ? (void *)start : (void *)end;
+ *size = end - start;
+ return 0;
+}
+#else
+# define get_main_stack(addr, size) get_stack(addr, size)
+#endif
+
#endif
static struct {
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