Start P4

1 files changed, 76 insertions, 0 deletions

diff --git a/P4/util.h b/P4/util.h
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+++ b/P4/util.h
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+#ifndef _UTIL_H
+#define _UTIL_H
+
+/**********************************************
+ * init
+   - port is the number of the port you want the server to be
+     started on
+   - initializes the connection acception/handling system
+   - YOU MUST CALL THIS EXACTLY ONCE (not once per thread,
+     but exactly one time, in the main thread of your program)
+     BEFORE USING ANY OF THE FUNCTIONS BELOW
+   - if init encounters any errors, it will call exit().
+************************************************/
+void init(int port);
+
+/**********************************************
+ * accept_connection - takes no parameters
+   - returns a file descriptor for further request processing.
+     DO NOT use the file descriptor on your own -- use
+     get_request() instead.
+   - if the return value is negative, the request should be ignored.
+***********************************************/
+int accept_connection(void);
+
+/**********************************************
+ * get_request
+   - parameters:
+      - fd is the file descriptor obtained by accept_connection()
+        from where you wish to get a request
+      - filename is the location of a character buffer in which
+        this function should store the requested filename. (Buffer
+        should be of size 1024 bytes.)
+   - returns 0 on success, nonzero on failure. You must account
+     for failures because some connections might send faulty
+     requests. This is a recoverable error - you must not exit
+     inside the thread that called get_request. After an error, you
+     must NOT use a return_request or return_error function for that
+     specific 'connection'.
+************************************************/
+int get_request(int fd, char *filename);
+
+/**********************************************
+ * return_result
+   - returns the contents of a file to the requesting client and cleans
+     up the connection to the client
+   - parameters:
+      - fd is the file descriptor obtained by accept_connection()
+        to where you wish to return the result of a request
+      - content_type is a pointer to a string that indicates the
+        type of content being returned. possible types include
+        "text/html", "text/plain", "image/gif", "image/jpeg" cor-
+        responding to .html, .txt, .gif, .jpg files.
+      - buf is a pointer to a memory location where the requested
+        file has been read into memory (the heap). return_result
+        will use this memory location to return the result to the
+        user. (remember to use -D_REENTRANT for CFLAGS.) you may
+        safely deallocate the memory after the call to
+        return_result (if it will not be cached).
+      - numbytes is the number of bytes the file takes up in buf
+   - returns 0 on success, nonzero on failure.
+************************************************/
+int return_result(int fd, char *content_type, char *buf, int numbytes);
+
+/**********************************************
+ * return_error
+   - returns an error message in response to a bad request and cleans
+     up the connection to the client
+   - parameters:
+      - fd is the file descriptor obtained by accept_connection()
+        to where you wish to return the error
+      - buf is a pointer to the location of the error text
+   - returns 0 on success, nonzero on failure.
+************************************************/
+int return_error(int fd, char *buf);
+
+#endif /* _UTIL_H */