GNU libmicrohttpd 0.9.5
daemon.c File Reference

A minimal-HTTP server library. More...

#include "platform.h"
#include "internal.h"
#include "response.h"
#include "connection.h"
#include "memorypool.h"
Include dependency graph for daemon.c:

Go to the source code of this file.

Defines

#define MHD_MAX_CONNECTIONS_DEFAULT   FD_SETSIZE -4
#define MHD_POOL_SIZE_DEFAULT   (32 * 1024)
#define DEBUG_CLOSE   MHD_NO
#define DEBUG_CONNECT   MHD_NO
#define MSG_NOSIGNAL   0
#define MSG_DONTWAIT   0
#define ATTRIBUTE_CONSTRUCTOR
#define ATTRIBUTE_DESTRUCTOR

Typedefs

typedef void(* VfprintfFunctionPointerType )(void *, const char *, va_list)

Functions

static void mhd_panic_std (void *cls, const char *file, unsigned int line, const char *reason)
static struct MHD_DaemonMHD_get_master (struct MHD_Daemon *daemon)
static void MHD_ip_count_lock (struct MHD_Daemon *daemon)
static void MHD_ip_count_unlock (struct MHD_Daemon *daemon)
static int MHD_ip_addr_compare (const void *a1, const void *a2)
static int MHD_ip_addr_to_key (const struct sockaddr *addr, socklen_t addrlen, struct MHD_IPCount *key)
static int MHD_ip_limit_add (struct MHD_Daemon *daemon, const struct sockaddr *addr, socklen_t addrlen)
static void MHD_ip_limit_del (struct MHD_Daemon *daemon, const struct sockaddr *addr, socklen_t addrlen)
int MHD_get_fdset (struct MHD_Daemon *daemon, fd_set *read_fd_set, fd_set *write_fd_set, fd_set *except_fd_set, int *max_fd)
static void * MHD_handle_connection (void *data)
static ssize_t recv_param_adapter (struct MHD_Connection *connection, void *other, size_t i)
static ssize_t send_param_adapter (struct MHD_Connection *connection, const void *other, size_t i)
static int create_thread (pthread_t *thread, const struct MHD_Daemon *daemon, void *(*start_routine)(void *), void *arg)
static int MHD_accept_connection (struct MHD_Daemon *daemon)
static void MHD_cleanup_connections (struct MHD_Daemon *daemon)
int MHD_get_timeout (struct MHD_Daemon *daemon, unsigned MHD_LONG_LONG *timeout)
static int MHD_select (struct MHD_Daemon *daemon, int may_block)
static int MHD_poll (struct MHD_Daemon *daemon)
int MHD_run (struct MHD_Daemon *daemon)
static void * MHD_select_thread (void *cls)
struct MHD_DaemonMHD_start_daemon (unsigned int options, uint16_t port, MHD_AcceptPolicyCallback apc, void *apc_cls, MHD_AccessHandlerCallback dh, void *dh_cls,...)
static int parse_options_va (struct MHD_Daemon *daemon, const struct sockaddr **servaddr, va_list ap)
static int parse_options (struct MHD_Daemon *daemon, const struct sockaddr **servaddr,...)
struct MHD_DaemonMHD_start_daemon_va (unsigned int options, uint16_t port, MHD_AcceptPolicyCallback apc, void *apc_cls, MHD_AccessHandlerCallback dh, void *dh_cls, va_list ap)
static void MHD_close_connections (struct MHD_Daemon *daemon)
void MHD_stop_daemon (struct MHD_Daemon *daemon)
union MHD_DaemonInfoMHD_get_daemon_info (struct MHD_Daemon *daemon, enum MHD_DaemonInfoType infoType,...)
void MHD_set_panic_func (MHD_PanicCallback cb, void *cls)
const char * MHD_get_version (void)
static void sigalrmHandler (int sig)
void ATTRIBUTE_CONSTRUCTOR MHD_init ()
void ATTRIBUTE_DESTRUCTOR MHD_fini ()

Variables

MHD_PanicCallback mhd_panic
void * mhd_panic_cls
static struct sigaction sig
static struct sigaction old

Detailed Description

A minimal-HTTP server library.

Author:
Daniel Pittman
Christian Grothoff

Definition in file daemon.c.


Define Documentation

#define ATTRIBUTE_CONSTRUCTOR

Definition at line 2325 of file daemon.c.

#define ATTRIBUTE_DESTRUCTOR

Definition at line 2326 of file daemon.c.

#define DEBUG_CLOSE   MHD_NO

Print extra messages with reasons for closing sockets? (only adds non-error messages).

Definition at line 65 of file daemon.c.

#define DEBUG_CONNECT   MHD_NO

Print extra messages when establishing connections? (only adds non-error messages).

Definition at line 71 of file daemon.c.

#define MHD_MAX_CONNECTIONS_DEFAULT   FD_SETSIZE -4

Default connection limit.

Definition at line 51 of file daemon.c.

Referenced by MHD_start_daemon_va().

#define MHD_POOL_SIZE_DEFAULT   (32 * 1024)

Default memory allowed per connection.

Definition at line 59 of file daemon.c.

Referenced by MHD_start_daemon_va().

#define MSG_DONTWAIT   0

Definition at line 78 of file daemon.c.

Referenced by recv_param_adapter(), and send_param_adapter().

#define MSG_NOSIGNAL   0

Definition at line 75 of file daemon.c.

Referenced by recv_param_adapter(), and send_param_adapter().


Typedef Documentation

typedef void(* VfprintfFunctionPointerType)(void *, const char *, va_list)

Definition at line 1371 of file daemon.c.


Function Documentation

static int create_thread ( pthread_t *  thread,
const struct MHD_Daemon daemon,
void *(*)(void *)  start_routine,
void *  arg 
) [static]

Create a thread and set the attributes according to our options.

Parameters:
threadhandle to initialize
daemondaemon with options
start_routinemain function of thread
argargument for start_routine
Returns:
0 on success

Definition at line 778 of file daemon.c.

References NULL, and MHD_Daemon::thread_stack_size.

Referenced by MHD_accept_connection(), and MHD_start_daemon_va().

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static int MHD_accept_connection ( struct MHD_Daemon daemon) [static]
static void MHD_cleanup_connections ( struct MHD_Daemon daemon) [static]

Free resources associated with all closed connections. (destroy responses, free buffers, etc.). A connection is known to be closed if the socket_fd is -1.

Parameters:
daemondaemon to clean up

Definition at line 1043 of file daemon.c.

References MHD_Connection::addr, MHD_Connection::addr_len, MHD_Daemon::connections, MHD_Connection::daemon, MHD_Daemon::max_connections, MHD_destroy_response(), MHD_ip_limit_del(), MHD_pool_destroy(), MHD_USE_THREAD_PER_CONNECTION, MHD_Connection::next, NULL, MHD_Daemon::options, MHD_Connection::pid, MHD_Connection::pool, MHD_Connection::response, MHD_Daemon::shutdown, SIGALRM, MHD_Connection::socket_fd, and STRERROR.

Referenced by MHD_close_connections(), MHD_run(), and MHD_select_thread().

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static void MHD_close_connections ( struct MHD_Daemon daemon) [static]

Close all connections for the daemon

Definition at line 2123 of file daemon.c.

References MHD_Daemon::connections, MHD_cleanup_connections(), MHD_connection_close(), MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN, NULL, and MHD_Connection::socket_fd.

Referenced by MHD_stop_daemon().

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void ATTRIBUTE_DESTRUCTOR MHD_fini ( )

Definition at line 2360 of file daemon.c.

References mhd_panic, mhd_panic_cls, NULL, old, sig, and SIGALRM.

union MHD_DaemonInfo* MHD_get_daemon_info ( struct MHD_Daemon daemon,
enum MHD_DaemonInfoType  infoType,
  ... 
) [write]

Obtain information about the given daemon (not fully implemented!).

Parameters:
daemonwhat daemon to get information about
infoTypewhat information is desired?
...depends on infoType
Returns:
NULL if this information is not available (or if the infoType is unknown)

Definition at line 2265 of file daemon.c.

References MHD_DAEMON_INFO_LISTEN_FD, NULL, and MHD_Daemon::socket_fd.

int MHD_get_fdset ( struct MHD_Daemon daemon,
fd_set *  read_fd_set,
fd_set *  write_fd_set,
fd_set *  except_fd_set,
int *  max_fd 
)

Obtain the select sets for this daemon.

Parameters:
daemondaemon to get sets from
read_fd_setread set
write_fd_setwrite set
except_fd_setexcept set
max_fdincreased to largest FD added (if larger than existing value); can be NULL
Returns:
MHD_YES on success, MHD_NO if this daemon was not started with the right options for this call.

Definition at line 514 of file daemon.c.

References MHD_Daemon::connections, MHD_connection_get_fdset(), MHD_NO, MHD_USE_POLL, MHD_USE_THREAD_PER_CONNECTION, MHD_YES, MHD_Connection::next, NULL, MHD_Daemon::options, MHD_Daemon::shutdown, and MHD_Daemon::socket_fd.

Referenced by MHD_select().

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static struct MHD_Daemon* MHD_get_master ( struct MHD_Daemon daemon) [static, read]

Trace up to and return master daemon. If the supplied daemon is a master, then return the daemon itself.

Parameters:
daemonhandle to a daemon
Returns:
master daemon handle

Definition at line 122 of file daemon.c.

References MHD_Daemon::master, and NULL.

Referenced by MHD_ip_limit_add(), and MHD_ip_limit_del().

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int MHD_get_timeout ( struct MHD_Daemon daemon,
unsigned MHD_LONG_LONG *  timeout 
)

Obtain timeout value for select for this daemon (only needed if connection timeout is used). The returned value is how long select should at most block, not the timeout value set for connections.

Parameters:
daemondaemon to query for timeout
timeoutset to the timeout (in milliseconds)
Returns:
MHD_YES on success, MHD_NO if timeouts are not used (or no connections exist that would necessiate the use of a timeout right now).

Definition at line 1112 of file daemon.c.

References MHD_Daemon::connection_timeout, MHD_Daemon::connections, MHD_Connection::last_activity, MHD_NO, MHD_USE_SSL, MHD_YES, MHD_Connection::next, NULL, and MHD_Daemon::options.

Referenced by MHD_select().

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const char* MHD_get_version ( void  )

Obtain the version of this library

Returns:
static version string, e.g. "0.4.1"

Definition at line 2304 of file daemon.c.

static void* MHD_handle_connection ( void *  data) [static]
void ATTRIBUTE_CONSTRUCTOR MHD_init ( )

Initialize the signal handler for SIGALRM and do other setup work.

Definition at line 2337 of file daemon.c.

References mhd_panic, mhd_panic_cls, mhd_panic_std(), NULL, old, sig, SIGALRM, and sigalrmHandler().

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static int MHD_ip_addr_compare ( const void *  a1,
const void *  a2 
) [static]

Tree comparison function for IP addresses (supplied to tsearch() family). We compare everything in the struct up through the beginning of the 'count' field.

Parameters:
a1first address to compare
a2second address to compare
Returns:
-1, 0 or 1 depending on result of compare

Definition at line 206 of file daemon.c.

Referenced by MHD_ip_limit_add(), and MHD_ip_limit_del().

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static int MHD_ip_addr_to_key ( const struct sockaddr *  addr,
socklen_t  addrlen,
struct MHD_IPCount *  key 
) [static]

Parse address and initialize 'key' using the address.

Parameters:
addraddress to parse
addrlennumber of bytes in addr
keywhere to store the parsed address
Returns:
MHD_YES on success and MHD_NO otherwise (e.g., invalid address type)

Definition at line 220 of file daemon.c.

References MHD_NO, and MHD_YES.

Referenced by MHD_ip_limit_add(), and MHD_ip_limit_del().

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static void MHD_ip_count_lock ( struct MHD_Daemon daemon) [static]

Lock shared structure for IP connection counts

Parameters:
daemonhandle to daemon where lock is

Definition at line 168 of file daemon.c.

References MHD_Daemon::per_ip_connection_mutex.

Referenced by MHD_ip_limit_add(), and MHD_ip_limit_del().

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static void MHD_ip_count_unlock ( struct MHD_Daemon daemon) [static]

Unlock shared structure for IP connection counts

Parameters:
daemonhandle to daemon where lock is

Definition at line 185 of file daemon.c.

References MHD_Daemon::per_ip_connection_mutex.

Referenced by MHD_ip_limit_add(), and MHD_ip_limit_del().

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static int MHD_ip_limit_add ( struct MHD_Daemon daemon,
const struct sockaddr *  addr,
socklen_t  addrlen 
) [static]

Check if IP address is over its limit.

Parameters:
daemonhandle to daemon where connection counts are tracked
addraddress to add (or increment counter)
addrlennumber of bytes in addr
Returns:
Return MHD_YES if IP below limit, MHD_NO if IP has surpassed limit. Also returns MHD_NO if fails to allocate memory.

Definition at line 259 of file daemon.c.

References MHD_get_master(), MHD_ip_addr_compare(), MHD_ip_addr_to_key(), MHD_ip_count_lock(), MHD_ip_count_unlock(), MHD_NO, MHD_YES, NULL, MHD_Daemon::per_ip_connection_count, MHD_Daemon::per_ip_connection_limit, and TSEARCH.

Referenced by MHD_accept_connection().

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static void MHD_ip_limit_del ( struct MHD_Daemon daemon,
const struct sockaddr *  addr,
socklen_t  addrlen 
) [static]

Decrement connection count for IP address, removing from table count reaches 0

Parameters:
daemonhandle to daemon where connection counts are tracked
addraddress to remove (or decrement counter)
addrlennumber of bytes in addr

Definition at line 325 of file daemon.c.

References MHD_get_master(), MHD_ip_addr_compare(), MHD_ip_addr_to_key(), MHD_ip_count_lock(), MHD_ip_count_unlock(), MHD_NO, MHD_Daemon::per_ip_connection_count, MHD_Daemon::per_ip_connection_limit, TDELETE, and TFIND.

Referenced by MHD_accept_connection(), and MHD_cleanup_connections().

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static void mhd_panic_std ( void *  cls,
const char *  file,
unsigned int  line,
const char *  reason 
) [static]

Default implementation of the panic function

Definition at line 94 of file daemon.c.

Referenced by MHD_init().

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static int MHD_poll ( struct MHD_Daemon daemon) [static]

Poll for new connection. Used only with THREAD_PER_CONNECTION

Parameters:
daemondaemon to run poll loop for

Definition at line 1264 of file daemon.c.

References MHD_accept_connection(), MHD_NO, MHD_USE_THREAD_PER_CONNECTION, MHD_YES, MHD_Daemon::options, MHD_Daemon::shutdown, MHD_Daemon::socket_fd, and STRERROR.

Referenced by MHD_select_thread().

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int MHD_run ( struct MHD_Daemon daemon)

Run webserver operations (without blocking unless in client callbacks). This method should be called by clients in combination with MHD_get_fdset if the client-controlled select method is used.

Returns:
MHD_YES on success, MHD_NO if this daemon was not started with the right options for this call.

Definition at line 1308 of file daemon.c.

References MHD_cleanup_connections(), MHD_NO, MHD_select(), MHD_USE_SELECT_INTERNALLY, MHD_USE_THREAD_PER_CONNECTION, MHD_YES, MHD_Daemon::options, and MHD_Daemon::shutdown.

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static int MHD_select ( struct MHD_Daemon daemon,
int  may_block 
) [static]

Main select call.

Parameters:
daemondaemon to run select loop for
may_blockYES if blocking, NO if non-blocking
Returns:
MHD_NO on serious errors, MHD_YES on success

Definition at line 1155 of file daemon.c.

References MHD_Daemon::connections, MHD_Connection::idle_handler, MHD_Daemon::max_connections, MHD_accept_connection(), MHD_get_fdset(), MHD_get_timeout(), MHD_LONG_LONG, MHD_NO, MHD_USE_THREAD_PER_CONNECTION, MHD_YES, MHD_Connection::next, NULL, MHD_Daemon::options, MHD_Connection::read_handler, SELECT, MHD_Daemon::shutdown, MHD_Connection::socket_fd, MHD_Daemon::socket_fd, STRERROR, and MHD_Connection::write_handler.

Referenced by MHD_run(), and MHD_select_thread().

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static void* MHD_select_thread ( void *  cls) [static]

Thread that runs the select loop until the daemon is explicitly shut down.

Parameters:
cls'struct MHD_Deamon' to run select loop in a thread for
Returns:
always NULL (on shutdown)

Definition at line 1328 of file daemon.c.

References MHD_cleanup_connections(), MHD_NO, MHD_poll(), MHD_select(), MHD_USE_POLL, MHD_YES, NULL, MHD_Daemon::options, and MHD_Daemon::shutdown.

Referenced by MHD_start_daemon_va().

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void MHD_set_panic_func ( MHD_PanicCallback  cb,
void *  cls 
)

Sets the global error handler to a different implementation. "cb" will only be called in the case of typically fatal, serious internal consistency issues. These issues should only arise in the case of serious memory corruption or similar problems with the architecture. While "cb" is allowed to return and MHD will then try to continue, this is never safe.

The default implementation that is used if no panic function is set simply calls "abort". Alternative implementations might call "exit" or other similar functions.

Parameters:
cbnew error handler
clspassed to error handler

Definition at line 2292 of file daemon.c.

References mhd_panic, and mhd_panic_cls.

struct MHD_Daemon* MHD_start_daemon ( unsigned int  options,
uint16_t  port,
MHD_AcceptPolicyCallback  apc,
void *  apc_cls,
MHD_AccessHandlerCallback  dh,
void *  dh_cls,
  ... 
) [read]

Start a webserver on the given port.

Parameters:
portport to bind to
apccallback to call to check which clients will be allowed to connect
apc_clsextra argument to apc
dhdefault handler for all URIs
dh_clsextra argument to dh
Returns:
NULL on error, handle to daemon on success

Definition at line 1355 of file daemon.c.

References MHD_start_daemon_va().

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struct MHD_Daemon* MHD_start_daemon_va ( unsigned int  options,
uint16_t  port,
MHD_AcceptPolicyCallback  apc,
void *  apc_cls,
MHD_AccessHandlerCallback  dh,
void *  dh_cls,
va_list  ap 
) [read]

Start a webserver on the given port.

Parameters:
portport to bind to
apccallback to call to check which clients will be allowed to connect
apc_clsextra argument to apc
dhdefault handler for all URIs
dh_clsextra argument to dh
Returns:
NULL on error, handle to daemon on success

Definition at line 1670 of file daemon.c.

References MHD_Daemon::apc, MHD_Daemon::apc_cls, BIND, CLOSE, MHD_Daemon::connection_timeout, create_thread(), MHD_Daemon::default_handler, MHD_Daemon::default_handler_cls, LISTEN, MHD_Daemon::master, MHD_Daemon::max_connections, MHD_http_unescape(), MHD_MAX_CONNECTIONS_DEFAULT, mhd_panic, mhd_panic_cls, MHD_POOL_SIZE_DEFAULT, MHD_select_thread(), MHD_stop_daemon(), MHD_USE_DEBUG, MHD_USE_IPv6, MHD_USE_POLL, MHD_USE_SELECT_INTERNALLY, MHD_USE_SSL, MHD_USE_THREAD_PER_CONNECTION, MHD_YES, NULL, MHD_Daemon::options, parse_options_va(), MHD_Daemon::per_ip_connection_mutex, MHD_Daemon::pid, MHD_Daemon::pool_size, MHD_Daemon::port, SETSOCKOPT, SOCKET, MHD_Daemon::socket_fd, STRERROR, MHD_Daemon::unescape_callback, MHD_Daemon::worker_pool, and MHD_Daemon::worker_pool_size.

Referenced by MHD_start_daemon().

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void MHD_stop_daemon ( struct MHD_Daemon daemon)
static int parse_options ( struct MHD_Daemon daemon,
const struct sockaddr **  servaddr,
  ... 
) [static]

Parse a list of options given as varargs.

Parameters:
daemonthe daemon to initialize
servaddrwhere to store the server's listen address
...the options
Returns:
MHD_YES on success, MHD_NO on error

Definition at line 1397 of file daemon.c.

References parse_options_va().

Referenced by parse_options_va().

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static int parse_options_va ( struct MHD_Daemon daemon,
const struct sockaddr **  servaddr,
va_list  ap 
) [static]

Parse a list of options given as varargs.

Parameters:
daemonthe daemon to initialize
servaddrwhere to store the server's listen address
apthe options
Returns:
MHD_YES on success, MHD_NO on error

Definition at line 1420 of file daemon.c.

References MHD_Daemon::connection_timeout, FPRINTF, MHD_Daemon::max_connections, MHD_NO, MHD_OPTION_ARRAY, MHD_OPTION_CONNECTION_LIMIT, MHD_OPTION_CONNECTION_MEMORY_LIMIT, MHD_OPTION_CONNECTION_TIMEOUT, MHD_OPTION_DIGEST_AUTH_RANDOM, MHD_OPTION_END, MHD_OPTION_EXTERNAL_LOGGER, MHD_OPTION_HTTPS_CRED_TYPE, MHD_OPTION_HTTPS_MEM_CERT, MHD_OPTION_HTTPS_MEM_KEY, MHD_OPTION_HTTPS_MEM_TRUST, MHD_OPTION_HTTPS_PRIORITIES, MHD_OPTION_LISTEN_SOCKET, MHD_OPTION_NONCE_NC_SIZE, MHD_OPTION_NOTIFY_COMPLETED, MHD_OPTION_PER_IP_CONNECTION_LIMIT, MHD_OPTION_SOCK_ADDR, MHD_OPTION_THREAD_POOL_SIZE, MHD_OPTION_THREAD_STACK_SIZE, MHD_OPTION_UNESCAPE_CALLBACK, MHD_OPTION_URI_LOG_CALLBACK, MHD_USE_SSL, MHD_YES, MHD_Daemon::notify_completed, MHD_Daemon::notify_completed_cls, NULL, MHD_OptionItem::option, MHD_Daemon::options, parse_options(), MHD_Daemon::per_ip_connection_limit, MHD_Daemon::pool_size, MHD_OptionItem::ptr_value, MHD_Daemon::socket_fd, MHD_Daemon::thread_stack_size, MHD_Daemon::unescape_callback, MHD_Daemon::unescape_callback_cls, MHD_Daemon::uri_log_callback, MHD_Daemon::uri_log_callback_cls, MHD_OptionItem::value, and MHD_Daemon::worker_pool_size.

Referenced by MHD_start_daemon_va(), and parse_options().

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static ssize_t recv_param_adapter ( struct MHD_Connection connection,
void *  other,
size_t  i 
) [static]

Callback for receiving data from the socket.

Parameters:
connthe MHD connection structure
otherwhere to write received data to
imaximum size of other (in bytes)
Returns:
number of bytes actually received

Definition at line 680 of file daemon.c.

References MHD_Connection::daemon, MHD_USE_SSL, MSG_DONTWAIT, MSG_NOSIGNAL, MHD_Daemon::options, RECV, and MHD_Connection::socket_fd.

Referenced by MHD_accept_connection().

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static ssize_t send_param_adapter ( struct MHD_Connection connection,
const void *  other,
size_t  i 
) [static]

Callback for writing data to the socket.

Parameters:
connthe MHD connection structure
otherdata to write
inumber of bytes to write
Returns:
actual number of bytes written

Definition at line 698 of file daemon.c.

References MHD_Connection::daemon, MHD_Response::fd, MHD_Response::fd_off, MHD_USE_SSL, MSG_DONTWAIT, MSG_NOSIGNAL, NULL, MHD_Daemon::options, MHD_Connection::response, MHD_Connection::response_write_position, SEND, MHD_Connection::socket_fd, MHD_Response::total_size, MHD_Connection::write_buffer_append_offset, and MHD_Connection::write_buffer_send_offset.

Referenced by MHD_accept_connection().

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static void sigalrmHandler ( int  sig) [static]

Definition at line 2316 of file daemon.c.

Referenced by MHD_init().

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Variable Documentation

struct sigaction old [static]

Definition at line 2313 of file daemon.c.

Referenced by MHD_fini(), MHD_init(), MHD_pool_reallocate(), and parse_cookie_header().

struct sigaction sig [static]

Definition at line 2311 of file daemon.c.

Referenced by MHD_fini(), and MHD_init().