71 lines
1.8 KiB
Diff
71 lines
1.8 KiB
Diff
diff --git a/thread_pthread.c b/thread_pthread.c
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index 951885ffa0..cf90321d1d 100644
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--- a/thread_pthread.c
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+++ b/thread_pthread.c
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@@ -656,9 +656,6 @@ hpux_attr_getstackaddr(const pthread_attr_t *attr, void **addr)
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# define MAINSTACKADDR_AVAILABLE 0
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# endif
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#endif
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-#if MAINSTACKADDR_AVAILABLE && !defined(get_main_stack)
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-# define get_main_stack(addr, size) get_stack(addr, size)
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-#endif
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#ifdef STACKADDR_AVAILABLE
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/*
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@@ -740,6 +737,55 @@ get_stack(void **addr, size_t *size)
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return 0;
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#undef CHECK_ERR
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}
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+
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+#if defined(__linux__) && !defined(__GLIBC__) && defined(HAVE_GETRLIMIT)
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+
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+#ifndef PAGE_SIZE
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+#include <unistd.h>
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+#define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
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+#endif
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+
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+static int
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+get_main_stack(void **addr, size_t *size)
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+{
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+ size_t start, end, limit, prevend = 0;
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+ struct rlimit r;
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+ FILE *f;
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+ char buf[PATH_MAX+80], s[8];
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+ int n;
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+ STACK_GROW_DIR_DETECTION;
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+
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+ f = fopen("/proc/self/maps", "re");
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+ if (!f)
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+ return -1;
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+ n = 0;
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+ while (fgets(buf, sizeof buf, f)) {
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+ n = sscanf(buf, "%zx-%zx %*s %*s %*s %*s %7s", &start, &end, s);
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+ if (n >= 2) {
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+ if (n == 3 && strcmp(s, "[stack]") == 0)
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+ break;
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+ prevend = end;
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+ }
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+ n = 0;
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+ }
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+ fclose(f);
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+ if (n == 0)
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+ return -1;
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+
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+ limit = 100 << 20; /* 100MB stack limit */
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+ if (getrlimit(RLIMIT_STACK, &r)==0 && r.rlim_cur < limit)
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+ limit = r.rlim_cur & -PAGE_SIZE;
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+ if (limit > end) limit = end;
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+ if (prevend < end - limit) prevend = end - limit;
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+ if (start > prevend) start = prevend;
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+ *addr = IS_STACK_DIR_UPPER() ? (void *)start : (void *)end;
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+ *size = end - start;
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+ return 0;
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+}
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+#else
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+# define get_main_stack(addr, size) get_stack(addr, size)
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+#endif
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+
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#endif
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static struct {
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