hurd: Add execveat

1 files changed, 92 insertions, 0 deletions

diff --git a/sysdeps/mach/hurd/execveat.c b/sysdeps/mach/hurd/execveat.c
new file mode 100644
index 0000000000..f8be069a86
--- /dev/null
+++ b/sysdeps/mach/hurd/execveat.c
@@ -0,0 +1,92 @@
+/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <getcwd.h>
+#include <hurd.h>
+#include <hurd/fd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+/* Replace the current process, executing FILE_NAME with arguments ARGV and
+   environment ENVP.  ARGV and ENVP are terminated by NULL pointers.  */
+int
+__execveat (int dirfd, const char *file_name, char *const argv[],
+            char *const envp[], int flags)
+{
+  error_t err;
+  char *concat_name = NULL;
+  const char *abs_path;
+
+  file_t file = __file_name_lookup_at (dirfd, flags, file_name, O_EXEC, 0);
+  if (file == MACH_PORT_NULL)
+    return -1;
+
+  if (file_name[0] == '/')
+    {
+      /* Already an absolute path */
+      abs_path = file_name;
+    }
+  else
+    {
+      /* Relative path */
+      char *cwd;
+      if (dirfd == AT_FDCWD)
+	{
+	  cwd = __getcwd (NULL, 0);
+	  if (cwd == NULL)
+	    {
+	      __mach_port_deallocate (__mach_task_self (), file);
+	      return -1;
+	    }
+	}
+      else
+	{
+	  err = HURD_DPORT_USE (dirfd,
+	    (cwd = __hurd_canonicalize_directory_name_internal (port, NULL, 0),
+	     cwd == NULL ? errno : 0));
+	  if (err)
+	    {
+	      __mach_port_deallocate (__mach_task_self (), file);
+	      return __hurd_fail (err);
+	    }
+	}
+
+      int res = __asprintf (&concat_name, "%s/%s", cwd, file_name);
+      free (cwd);
+      if (res == -1)
+	{
+	  __mach_port_deallocate (__mach_task_self (), file);
+	  return -1;
+	}
+
+      abs_path = concat_name;
+    }
+
+  /* Hopefully this will not return.  */
+  err = _hurd_exec_paths (__mach_task_self (), file,
+			  file_name, abs_path, argv, envp);
+
+  /* Oh well.  Might as well be tidy.  */
+  __mach_port_deallocate (__mach_task_self (), file);
+  free (concat_name);
+
+  return __hurd_fail (err);
+}
+
+weak_alias (__execveat, execveat)