Problem - Kevin Tafuro

#endif
return 1;
}
int spc_socketpool_setlimit(int limit) {
SPC_ACQUIRE_MUTEX(socketpool_mutex);
if (socketpool_limit > 0 && socketpool_used >= socketpool_limit) {
if (limit socketpool_limit)
SPC_BROADCAST_COND(socketpool_cond);
}
socketpool_limit = limit;
SPC_RELEASE_MUTEX(socketpool_mutex);
return 1;
}
The wrappers for the accept( ) and socket( ) calls are very similar, and they really
differ only in the arguments they accept. Our wrappers add an extra argument that
indicates whether the functions should wait for a socket to become available if one is
not immediately available. Any nonzero value will cause the functions to wait until a
socket becomes available. A value of zero will cause the functions to return immediately
with errno set to EMFILE if there are no available sockets. Should the actual
wrapped functions return any kind of error, the wrapper functions will return that
error immediately without incrementing the socket count.
static void socketpool_cleanup(void *arg) {
SPC_RELEASE_MUTEX(socketpool_mutex);
}
int spc_socketpool_accept(int sd, struct sockaddr *addr, int *addrlen, int block) {
int avail = 1, new_sd = -1;
SPC_ACQUIRE_MUTEX(socketpool_mutex);
SPC_CLEANUP_PUSH(socketpool_cleanup, 0);
if (socketpool_limit > 0 && socketpool_used >= socketpool_limit) {
if (!block) {
avail = 0;
errno = EMFILE;
} else {
while (socketpool_limit > 0 && socketpool_used >= socketpool_limit)
SPC_WAIT_COND(socketpool_cond, socketpool_mutex);
}
}
if (avail && (new_sd = accept(sd, addr, addrlen)) != -1)
socketpool_used++;
SPC_CLEANUP_POP(1);
return new_sd;
}
int spc_socketpool_socket(int domain, int type, int protocol, int block) {
int avail = 1, new_sd = -1;
SPC_ACQUIRE_MUTEX(socketpool_mutex);
SPC_CLEANUP_PUSH(socketpool_cleanup, 0);
726 | Chapter 13: Other Topics
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