1 files changed, 30 insertions, 0 deletions
diff --git a/src/system.h b/src/system.h
new file mode 100644
index 0000000..950a82a
--- /dev/null
+++ b/src/system.h
@@ -0,0 +1,30 @@
+#ifndef SYSTEM_H
+#define SYSTEM_H
+
+/* Routines for interacting with the system, mainly executing processes and
+ * dealing with the file system. */
+
+/* Used when encrypting or decrypting a file, see the copy_file_with_encryption
+ * function. */
+enum encrypt {
+	ENCRYPT,
+	DECRYPT
+};
+
+/* Return whether PATH exists in the file system. Exit if any non-"file not
+ * fount" error occurs. */
+int file_exists(const char *path);
+
+/* Copy the file whose path is IN at path OUT. OUT is created or overwritten if
+ * needed. */
+void copy_file(const char *in, const char *out);
+
+/* Like copy_file but with encryption, which is managed using GPG.  */
+void copy_file_with_encryption(const char *in, const char *out, enum encrypt encrypt);
+
+/* Execute command in a child process, then wait for the child to exit before
+ * returning. If any error occurs, including in the child process, then if EXIT
+ * is non-zero, exit, else return -1. Return 0 on success. */
+int ftag_execvp(char *const *cmd, int can_exit);
+
+#endif