Remove old stack code and improve dirstream

libc/calls/chdir.c

@@ -21,7 +21,9 @@
 #include "libc/dce.h"
 #include "libc/intrin/asan.internal.h"
 #include "libc/intrin/strace.internal.h"
+#include "libc/intrin/weaken.h"
 #include "libc/runtime/runtime.h"
+#include "libc/runtime/zipos.internal.h"
 #include "libc/sysv/errfuns.h"
 
 /**
@@ -30,14 +32,27 @@
  * This does *not* update the `PWD` environment variable.
  *
  * @return 0 on success, or -1 w/ errno
+ * @raise ELOOP if a loop was detected resolving components of `path`
+ * @raise EACCES if search permission was denied on directory
+ * @raise ENOTDIR if component of `path` isn't a directory
+ * @raise ENOMEM if insufficient memory was available
+ * @raise EFAULT if `path` points to invalid memory
+ * @raise ENOTSUP if `path` is a `/zip/...` file
+ * @raise ENAMETOOLONG if `path` was too long
+ * @raise ENOENT if `path` doesn't exist
+ * @raise EIO if an i/o error happened
  * @asyncsignalsafe
  * @see fchdir()
  */
 int chdir(const char *path) {
   int rc;
+  struct ZiposUri zipname;
   GetProgramExecutableName();  // XXX: ugly workaround
   if (!path || (IsAsan() && !__asan_is_valid_str(path))) {
     rc = efault();
+  } else if (_weaken(__zipos_parseuri) &&
+             _weaken(__zipos_parseuri)(path, &zipname) != -1) {
+    rc = enotsup();
   } else if (!IsWindows()) {
     rc = sys_chdir(path);
   } else {

libc/calls/fchdir.c

@@ -17,22 +17,30 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
+#include "libc/calls/internal.h"
 #include "libc/calls/syscall-nt.internal.h"
 #include "libc/calls/syscall-sysv.internal.h"
 #include "libc/dce.h"
 #include "libc/intrin/strace.internal.h"
+#include "libc/sysv/errfuns.h"
 
 /**
  * Sets current directory based on file descriptor.
  *
  * This does *not* update the `PWD` environment variable.
  *
+ * @raise EACCES if search permission was denied on directory
+ * @raise ENOTDIR if `dirfd` doesn't refer to a directory
+ * @raise EBADF if `dirfd` isn't a valid file descriptor
+ * @raise ENOTSUP if `dirfd` refers to `/zip/...` file
  * @see open(path, O_DIRECTORY)
  * @asyncsignalsafe
  */
 int fchdir(int dirfd) {
   int rc;
-  if (!IsWindows()) {
+  if (__isfdkind(dirfd, kFdZip)) {
+    rc = enotsup();
+  } else if (!IsWindows()) {
     rc = sys_fchdir(dirfd);
   } else {
     rc = sys_fchdir_nt(dirfd);

libc/calls/getrlimit.c

@@ -22,6 +22,7 @@
 #include "libc/intrin/asan.internal.h"
 #include "libc/intrin/describeflags.internal.h"
 #include "libc/intrin/strace.internal.h"
+#include "libc/runtime/stack.h"
 #include "libc/sysv/consts/rlimit.h"
 #include "libc/sysv/errfuns.h"
 
@@ -41,6 +42,10 @@ int getrlimit(int resource, struct rlimit *rlim) {
     rc = efault();
   } else if (!IsWindows()) {
     rc = sys_getrlimit(resource, rlim);
+  } else if (resource == RLIMIT_STACK) {
+    rlim->rlim_cur = (uintptr_t)ape_stack_memsz;
+    rlim->rlim_max = (uintptr_t)ape_stack_memsz;
+    rc = 0;
   } else if (resource == RLIMIT_AS) {
     rlim->rlim_cur = __virtualmax;
     rlim->rlim_max = __virtualmax;

libc/calls/setrlimit.c

@@ -78,6 +78,8 @@ int setrlimit(int resource, const struct rlimit *rlim) {
       // TODO(jart): What's up with XNU and NetBSD?
       __virtualmax = rlim->rlim_cur;
     }
+  } else if (resource == RLIMIT_STACK) {
+    rc = enotsup();
   } else if (resource == RLIMIT_AS) {
     __virtualmax = rlim->rlim_cur;
     rc = 0;

libc/calls/wincrash.c

@@ -78,6 +78,7 @@ unsigned __wincrash(struct NtExceptionPointers *ep) {
       break;
     case kNtSignalGuardPage:
     case kNtSignalInPageError:
+    case kNtStatusStackOverflow:
       code = SEGV_MAPERR;
       sig = SIGSEGV;
       break;
@@ -128,7 +129,9 @@ unsigned __wincrash(struct NtExceptionPointers *ep) {
       sig = SIGSYS;
       break;
     default:
-      return kNtExceptionContinueSearch;
+      code = ep->ExceptionRecord->ExceptionCode;
+      sig = SIGSEGV;
+      break;
   }
   rip = ep->ContextRecord->Rip;