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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:40:04 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 14:40:04 +0000 |
commit | 25505898530a333011f4fd5cbc841ad6b26c089c (patch) | |
tree | 333a33fdd60930bcccc3f177ed9467d535e9bac6 /openbsd-compat/bsd-poll.c | |
parent | Initial commit. (diff) | |
download | openssh-upstream.tar.xz openssh-upstream.zip |
Adding upstream version 1:9.2p1.upstream/1%9.2p1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'openbsd-compat/bsd-poll.c')
-rw-r--r-- | openbsd-compat/bsd-poll.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/openbsd-compat/bsd-poll.c b/openbsd-compat/bsd-poll.c new file mode 100644 index 0000000..967f947 --- /dev/null +++ b/openbsd-compat/bsd-poll.c @@ -0,0 +1,115 @@ +/* + * Copyright (c) 2004, 2005, 2007 Darren Tucker (dtucker at zip com au). + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include "includes.h" +#if !defined(HAVE_PPOLL) || !defined(HAVE_POLL) || defined(BROKEN_POLL) + +#include <sys/types.h> +#include <sys/time.h> +#ifdef HAVE_SYS_PARAM_H +# include <sys/param.h> +#endif +#ifdef HAVE_SYS_SELECT_H +# include <sys/select.h> +#endif + +#include <errno.h> +#include <signal.h> +#include <stdlib.h> +#include <unistd.h> +#include "bsd-poll.h" + +#if !defined(HAVE_PPOLL) || defined(BROKEN_POLL) +/* + * A minimal implementation of ppoll(2), built on top of pselect(2). + * + * Only supports POLLIN, POLLOUT and POLLPRI flags in pfd.events and + * revents. Notably POLLERR, POLLHUP and POLLNVAL are not supported. + * + * Supports pfd.fd = -1 meaning "unused" although it's not standard. + */ + +int +ppoll(struct pollfd *fds, nfds_t nfds, const struct timespec *tmoutp, + const sigset_t *sigmask) +{ + nfds_t i; + int ret, fd, maxfd = 0; + fd_set readfds, writefds, exceptfds; + + for (i = 0; i < nfds; i++) { + fd = fds[i].fd; + if (fd != -1 && fd >= FD_SETSIZE) { + errno = EINVAL; + return -1; + } + maxfd = MAX(maxfd, fd); + } + + /* populate event bit vectors for the events we're interested in */ + FD_ZERO(&readfds); + FD_ZERO(&writefds); + FD_ZERO(&exceptfds); + for (i = 0; i < nfds; i++) { + fd = fds[i].fd; + if (fd == -1) + continue; + if (fds[i].events & POLLIN) + FD_SET(fd, &readfds); + if (fds[i].events & POLLOUT) + FD_SET(fd, &writefds); + if (fds[i].events & POLLPRI) + FD_SET(fd, &exceptfds); + } + + ret = pselect(maxfd + 1, &readfds, &writefds, &exceptfds, tmoutp, sigmask); + + /* scan through select results and set poll() flags */ + for (i = 0; i < nfds; i++) { + fd = fds[i].fd; + fds[i].revents = 0; + if (fd == -1) + continue; + if ((fds[i].events & POLLIN) && FD_ISSET(fd, &readfds)) + fds[i].revents |= POLLIN; + if ((fds[i].events & POLLOUT) && FD_ISSET(fd, &writefds)) + fds[i].revents |= POLLOUT; + if ((fds[i].events & POLLPRI) && FD_ISSET(fd, &exceptfds)) + fds[i].revents |= POLLPRI; + } + + return ret; +} +#endif /* !HAVE_PPOLL || BROKEN_POLL */ + +#if !defined(HAVE_POLL) || defined(BROKEN_POLL) +int +poll(struct pollfd *fds, nfds_t nfds, int timeout) +{ + struct timespec ts, *tsp = NULL; + + /* poll timeout is msec, ppoll is timespec (sec + nsec) */ + if (timeout >= 0) { + ts.tv_sec = timeout / 1000; + ts.tv_nsec = (timeout % 1000) * 1000000; + tsp = &ts; + } + + return ppoll(fds, nfds, tsp, NULL); +} +#endif /* !HAVE_POLL || BROKEN_POLL */ + +#endif /* !HAVE_PPOLL || !HAVE_POLL || BROKEN_POLL */ |