| 1 | /* |
1 | /* |
| 2 | * libev kqueue backend |
2 | * libev kqueue backend |
| 3 | * |
3 | * |
| 4 | * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de> |
4 | * Copyright (c) 2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann <libev@schmorp.de> |
| 5 | * All rights reserved. |
5 | * All rights reserved. |
| 6 | * |
6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without modifica- |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
| 8 | * tion, are permitted provided that the following conditions are met: |
8 | * tion, are permitted provided that the following conditions are met: |
| 9 | * |
9 | * |
| … | |
… | |
| 153 | } |
153 | } |
| 154 | |
154 | |
| 155 | int inline_size |
155 | int inline_size |
| 156 | kqueue_init (EV_P_ int flags) |
156 | kqueue_init (EV_P_ int flags) |
| 157 | { |
157 | { |
| 158 | /* Initialize the kernel queue */ |
158 | /* initialize the kernel queue */ |
|
|
159 | kqueue_fd_pid = getpid (); |
| 159 | if ((backend_fd = kqueue ()) < 0) |
160 | if ((backend_fd = kqueue ()) < 0) |
| 160 | return 0; |
161 | return 0; |
| 161 | |
162 | |
| 162 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ |
163 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ |
| 163 | |
164 | |
| 164 | backend_fudge = 1e-9; /* apparently, they did the right thing in freebsd */ |
165 | backend_mintime = 1e-9; /* apparently, they did the right thing in freebsd */ |
| 165 | backend_modify = kqueue_modify; |
166 | backend_modify = kqueue_modify; |
| 166 | backend_poll = kqueue_poll; |
167 | backend_poll = kqueue_poll; |
| 167 | |
168 | |
| 168 | kqueue_eventmax = 64; /* initial number of events receivable per poll */ |
169 | kqueue_eventmax = 64; /* initial number of events receivable per poll */ |
| 169 | kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); |
170 | kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); |
| 170 | |
171 | |
| 171 | kqueue_changes = 0; |
172 | kqueue_changes = 0; |
| … | |
… | |
| 183 | } |
184 | } |
| 184 | |
185 | |
| 185 | void inline_size |
186 | void inline_size |
| 186 | kqueue_fork (EV_P) |
187 | kqueue_fork (EV_P) |
| 187 | { |
188 | { |
|
|
189 | /* some BSD kernels don't just destroy the kqueue itself, |
|
|
190 | * but also close the fd, which isn't documented, and |
|
|
191 | * impossible to support properly. |
|
|
192 | * we remember the pid of the kqueue call and only close |
|
|
193 | * the fd if the pid is still the same. |
|
|
194 | * this leaks fds on sane kernels, but BSD interfaces are |
|
|
195 | * notoriously buggy and rarely get fixed. |
|
|
196 | */ |
|
|
197 | pid_t newpid = getpid (); |
|
|
198 | |
|
|
199 | if (newpid == kqueue_fd_pid) |
| 188 | close (backend_fd); |
200 | close (backend_fd); |
| 189 | |
201 | |
|
|
202 | kqueue_fd_pid = newpid; |
| 190 | while ((backend_fd = kqueue ()) < 0) |
203 | while ((backend_fd = kqueue ()) < 0) |
| 191 | ev_syserr ("(libev) kqueue"); |
204 | ev_syserr ("(libev) kqueue"); |
| 192 | |
205 | |
| 193 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
206 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
| 194 | |
207 | |
| 195 | /* re-register interest in fds */ |
208 | /* re-register interest in fds */ |
| 196 | fd_rearm_all (EV_A); |
209 | fd_rearm_all (EV_A); |
| 197 | } |
210 | } |
| 198 | |
211 | |
|
|
212 | /* sys/event.h defines EV_ERROR */ |
|
|
213 | #undef EV_ERROR |
|
|
214 | |
