?? fig17.36
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#include "opend.h"#define NALLOC 10 /* # client structs to alloc/realloc for */static voidclient_alloc(void) /* alloc more entries in the client[] array */{ int i; if (client == NULL) client = malloc(NALLOC * sizeof(Client)); else client = realloc(client, (client_size+NALLOC)*sizeof(Client)); if (client == NULL) err_sys("can't alloc for client array"); /* initialize the new entries */ for (i = client_size; i < client_size + NALLOC; i++) client[i].fd = -1; /* fd of -1 means entry available */ client_size += NALLOC;}/* * Called by loop() when connection request from a new client arrives. */intclient_add(int fd, uid_t uid){ int i; if (client == NULL) /* first time we're called */ client_alloc();again: for (i = 0; i < client_size; i++) { if (client[i].fd == -1) { /* find an available entry */ client[i].fd = fd; client[i].uid = uid; return(i); /* return index in client[] array */ } } /* client array full, time to realloc for more */ client_alloc(); goto again; /* and search again (will work this time) */}/* * Called by loop() when we're done with a client. */voidclient_del(int fd){ int i; for (i = 0; i < client_size; i++) { if (client[i].fd == fd) { client[i].fd = -1; return; } } log_quit("can't find client entry for fd %d", fd);}
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