diff options
Diffstat (limited to 'login/programs/utmpd.c')
| -rw-r--r-- | login/programs/utmpd.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/login/programs/utmpd.c b/login/programs/utmpd.c index c2e9fe0a8b..b3384f51d5 100644 --- a/login/programs/utmpd.c +++ b/login/programs/utmpd.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1997 Free Software Foundation, Inc. +/* Copyright (C) 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997. @@ -28,6 +28,7 @@ #include <stdlib.h> #include <signal.h> #include <string.h> +#include <sys/param.h> #include <sys/select.h> #include <sys/socket.h> #include <sys/stat.h> @@ -270,6 +271,7 @@ void handle_requests (void) fd_set read_fd_set; fd_set write_fd_set; int fd; + int maxfd; /* Highest used fd to optimize select/loop. */ /* Initialize the set of active sockets. */ FD_ZERO (&active_read_fd_set); @@ -277,16 +279,18 @@ void handle_requests (void) FD_SET (rw_sock, &active_read_fd_set); FD_SET (ro_sock, &active_read_fd_set); + maxfd = MAX (rw_sock, ro_sock); + while (1) { /* Block until input arrives on one or more active sockets. */ read_fd_set = active_read_fd_set; write_fd_set = active_write_fd_set; - if (select (FD_SETSIZE, &read_fd_set, &write_fd_set, NULL, NULL) < 0) + if (select (maxfd + 1, &read_fd_set, &write_fd_set, NULL, NULL) < 0) error (EXIT_FAILURE, errno, _("cannot get input on sockets")); /* Service all the sockets with input pending. */ - for (fd = 0; fd < FD_SETSIZE; fd++) + for (fd = 0; fd <= maxfd; ++fd) { if (FD_ISSET (fd, &read_fd_set)) { @@ -299,6 +303,7 @@ void handle_requests (void) error (0, errno, _("cannot accept connection")); FD_SET (connection->sock, &active_read_fd_set); + maxfd = MAX (maxfd, connection->sock); } else { @@ -335,6 +340,14 @@ void handle_requests (void) FD_CLR (fd, &active_write_fd_set); } } + + /* Check if maxfd can be lowered. */ + for (; maxfd >= 0; --maxfd) + { + if (FD_ISSET (maxfd, &active_read_fd_set) + || FD_ISSET (maxfd, &active_write_fd_set)) + break; + } } } |