1 files changed, 74 insertions, 0 deletions
diff --git a/src/nxt_job_file.h b/src/nxt_job_file.h
new file mode 100644
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+++ b/src/nxt_job_file.h
@@ -0,0 +1,74 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef _NXT_JOB_FILE_H_INCLUDED_
+#define _NXT_JOB_FILE_H_INCLUDED_
+
+
+/*
+ * nxt_job_file_read() allows to open a file, to get its type, size, and
+ * modification time, to read or map file content to memory, and to close
+ * the file.  It can be done as one operation for small file or as several
+ * operations for large file.  On each operation completion ready_handler
+ * or error_handler completion handlers are called.  Since they are job
+ * operations, they can be run by a thread pool.
+ *
+ * If a file is not opened then it is opened and its type, size, and
+ * modification time are got.  Then file content starting from given offset
+ * is read or mapped in memory if there is a buffer supplied.  The offset
+ * field is correspondingly updated.
+ *
+ * If there is no buffer but the read_ahead flag is set then the first
+ * byte is read to initiate read ahead operation.
+ *
+ * If the close flag is set then file descriptor is closed when the file
+ * is completely read.
+ *
+ * The complete flag is set by nxt_job_file_read() when the file is
+ * completely read.
+ *
+ * The test_before_open flag allows to save syscalls in some case, for
+ * example, not to open and then not to close a directory.  It calls
+ * nxt_file_info() to get file type, size, and modification time before
+ * opening the file.  A custom read_required() callback combined with this
+ * flag can also omit opening and reading on some conditions.  However,
+ * if the callback forces opening then additional nxt_file_info() is
+ * called after opening.  The default read_required() callback always
+ * forces opening and reading.
+ */
+
+
+typedef struct nxt_job_file_s  nxt_job_file_t;
+
+struct nxt_job_file_s {
+    nxt_job_t           job;
+
+    nxt_file_t          file;
+
+    nxt_off_t           offset;
+    nxt_buf_t           *buffer;
+
+    nxt_work_handler_t  ready_handler;
+    nxt_work_handler_t  error_handler;
+
+    nxt_int_t           (*read_required)(nxt_job_file_t *jbf);
+
+    uint16_t            directory_end;
+
+    uint16_t            close_before_open:1;
+    uint16_t            test_before_open:1;
+    uint16_t            read_ahead:1;
+    uint16_t            close:1;
+    uint16_t            complete:1;
+};
+
+
+NXT_EXPORT nxt_job_file_t *nxt_job_file_create(nxt_mem_pool_t *mp);
+NXT_EXPORT void nxt_job_file_init(nxt_job_file_t *jbf);
+NXT_EXPORT void nxt_job_file_read(nxt_thread_t *thr, nxt_job_t *job);
+
+
+#endif /* _NXT_JOB_FILE_H_INCLUDED_ */