stack-pid move to tools

1 files changed, 54 insertions, 0 deletions

diff --git a/tools/stack-pid.c b/tools/stack-pid.c
new file mode 100644
index 0000000..8a03d4d
--- /dev/null
+++ b/tools/stack-pid.c
@@ -0,0 +1,54 @@
+#include <sys/ptrace.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <stdarg.h>
+
+#include <libunwind-ptrace.h>
+
+void die(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	exit(1);
+}
+
+
+int main(int argc, char **argv)
+{
+	if (argc != 2)
+		die("USAGE: unwind-pid <pid>\n");
+
+	unw_addr_space_t as = unw_create_addr_space(&_UPT_accessors, 0);
+
+	pid_t pid = atoi(argv[1]);
+	if (ptrace(PTRACE_ATTACH, pid, 0, 0) != 0)
+		die("ERROR: cannot attach to %d\n", pid);
+
+	void *context = _UPT_create(pid);
+	unw_cursor_t cursor;
+	if (unw_init_remote(&cursor, as, context) != 0)
+		die("ERROR: cannot initialize cursor for remote unwinding\n");
+
+	do {
+		unw_word_t offset, pc;
+		char sym[4096];
+		if (unw_get_reg(&cursor, UNW_REG_IP, &pc))
+			die("ERROR: cannot read program counter\n");
+
+		printf("0x%lx: ", pc);
+
+		if (unw_get_proc_name(&cursor, sym, sizeof(sym), &offset) == 0)
+			printf("(%s+0x%lx)\n", sym, offset);
+		else
+			printf("-- no symbol name found\n");
+	} while (unw_step(&cursor) > 0);
+
+	_UPT_destroy(context);
+	(void) ptrace(PTRACE_DETACH, pid, 0, 0);
+
+	return 0;
+}