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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 */
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