Initial import

libc/log/gdb.h

@@ -0,0 +1,37 @@
+#ifndef COSMOPOLITAN_LIBC_LOG_GDB_H_
+#define COSMOPOLITAN_LIBC_LOG_GDB_H_
+#include "libc/calls/calls.h"
+#include "libc/runtime/missioncritical.h"
+#include "libc/sysv/consts/nr.h"
+#include "libc/sysv/consts/w.h"
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+extern volatile int g_gdbsync;
+
+int gdbexec(const char *);
+int attachdebugger(intptr_t);
+
+#define attachdebugger(CONTINUE_TO_ADDR) /* shorten backtraces */ \
+  SYNCHRONIZE_DEBUGGER((attachdebugger)(CONTINUE_TO_ADDR))
+
+#define SYNCHRONIZE_DEBUGGER(PID)                           \
+  ({                                                        \
+    int Rc, Pid = (PID);                                    \
+    if (Pid != -1) {                                        \
+      while ((Rc = WAIT4(Pid, NULL, WNOHANG, NULL)) == 0) { \
+        if (g_gdbsync) {                                    \
+          g_gdbsync = 0;                                    \
+          if (Rc > 0) Pid = 0;                              \
+          break;                                            \
+        } else {                                            \
+          SCHED_YIELD();                                    \
+        }                                                   \
+      }                                                     \
+    }                                                       \
+    Pid;                                                    \
+  })
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_LOG_GDB_H_ */