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-rw-r--r--nsprpub/pr/src/md/unix/uxwrap.c513
1 files changed, 513 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/unix/uxwrap.c b/nsprpub/pr/src/md/unix/uxwrap.c
new file mode 100644
index 000000000..3f8e149ef
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/uxwrap.c
@@ -0,0 +1,513 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ *------------------------------------------------------------------------
+ * File: uxwrap.c
+ *
+ * Our wrapped versions of the Unix select() and poll() system calls.
+ *
+ *------------------------------------------------------------------------
+ */
+
+#include "primpl.h"
+
+#if defined(_PR_PTHREADS) || defined(_PR_GLOBAL_THREADS_ONLY) || defined(QNX)
+/* Do not wrap select() and poll(). */
+#else /* defined(_PR_PTHREADS) || defined(_PR_GLOBAL_THREADS_ONLY) */
+/* The include files for select() */
+#ifdef IRIX
+#include <unistd.h>
+#include <bstring.h>
+#endif
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+
+#define ZAP_SET(_to, _width) \
+ PR_BEGIN_MACRO \
+ memset(_to, 0, \
+ ((_width + 8*sizeof(int)-1) / (8*sizeof(int))) \
+ * sizeof(int) \
+ ); \
+ PR_END_MACRO
+
+/* see comments in ns/cmd/xfe/mozilla.c (look for "PR_XGetXtHackFD") */
+static int _pr_xt_hack_fd = -1;
+
+int PR_XGetXtHackFD(void)
+{
+ int fds[2];
+
+ if (_pr_xt_hack_fd == -1) {
+ if (!pipe(fds)) {
+ _pr_xt_hack_fd = fds[0];
+ }
+ }
+ return _pr_xt_hack_fd;
+}
+
+static int (*_pr_xt_hack_okayToReleaseXLock)(void) = 0;
+
+void PR_SetXtHackOkayToReleaseXLockFn(int (*fn)(void))
+{
+ _pr_xt_hack_okayToReleaseXLock = fn;
+}
+
+
+/*
+ *-----------------------------------------------------------------------
+ * select() --
+ *
+ * Wrap up the select system call so that we can deschedule
+ * a thread that tries to wait for i/o.
+ *
+ *-----------------------------------------------------------------------
+ */
+
+#if defined(HPUX9)
+int select(size_t width, int *rl, int *wl, int *el, const struct timeval *tv)
+#elif defined(AIX_RENAME_SELECT)
+int wrap_select(unsigned long width, void *rl, void *wl, void *el,
+ struct timeval *tv)
+#elif defined(_PR_SELECT_CONST_TIMEVAL)
+int select(int width, fd_set *rd, fd_set *wr, fd_set *ex,
+ const struct timeval *tv)
+#else
+int select(int width, fd_set *rd, fd_set *wr, fd_set *ex, struct timeval *tv)
+#endif
+{
+ int osfd;
+ _PRUnixPollDesc *unixpds, *unixpd, *eunixpd;
+ PRInt32 pdcnt;
+ PRIntervalTime timeout;
+ int retVal;
+#if defined(HPUX9) || defined(AIX_RENAME_SELECT)
+ fd_set *rd = (fd_set*) rl;
+ fd_set *wr = (fd_set*) wl;
+ fd_set *ex = (fd_set*) el;
+#endif
+
+#if 0
+ /*
+ * Easy special case: zero timeout. Simply call the native
+ * select() with no fear of blocking.
+ */
+ if (tv != NULL && tv->tv_sec == 0 && tv->tv_usec == 0) {
+#if defined(HPUX9) || defined(AIX_RENAME_SELECT)
+ return _MD_SELECT(width, rl, wl, el, tv);
+#else
+ return _MD_SELECT(width, rd, wr, ex, tv);
+#endif
+ }
+#endif
+
+ if (!_pr_initialized) {
+ _PR_ImplicitInitialization();
+ }
+
+#ifndef _PR_LOCAL_THREADS_ONLY
+ if (_PR_IS_NATIVE_THREAD(_PR_MD_CURRENT_THREAD())) {
+ return _MD_SELECT(width, rd, wr, ex, tv);
+ }
+#endif
+
+ if (width < 0 || width > FD_SETSIZE) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* Compute timeout */
+ if (tv) {
+ /*
+ * These acceptable ranges for t_sec and t_usec are taken
+ * from the select() man pages.
+ */
+ if (tv->tv_sec < 0 || tv->tv_sec > 100000000
+ || tv->tv_usec < 0 || tv->tv_usec >= 1000000) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* Convert microseconds to ticks */
+ timeout = PR_MicrosecondsToInterval(1000000*tv->tv_sec + tv->tv_usec);
+ } else {
+ /* tv being a NULL pointer means blocking indefinitely */
+ timeout = PR_INTERVAL_NO_TIMEOUT;
+ }
+
+ /* Check for no descriptors case (just doing a timeout) */
+ if ((!rd && !wr && !ex) || !width) {
+ PR_Sleep(timeout);
+ return 0;
+ }
+
+ /*
+ * Set up for PR_Poll(). The PRPollDesc array is allocated
+ * dynamically. If this turns out to have high performance
+ * penalty, one can change to use a large PRPollDesc array
+ * on the stack, and allocate dynamically only when it turns
+ * out to be not large enough.
+ *
+ * I allocate an array of size 'width', which is the maximum
+ * number of fds we may need to poll.
+ */
+ unixpds = (_PRUnixPollDesc *) PR_CALLOC(width * sizeof(_PRUnixPollDesc));
+ if (!unixpds) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ pdcnt = 0;
+ unixpd = unixpds;
+ for (osfd = 0; osfd < width; osfd++) {
+ int in_flags = 0;
+ if (rd && FD_ISSET(osfd, rd)) {
+ in_flags |= _PR_UNIX_POLL_READ;
+ }
+ if (wr && FD_ISSET(osfd, wr)) {
+ in_flags |= _PR_UNIX_POLL_WRITE;
+ }
+ if (ex && FD_ISSET(osfd, ex)) {
+ in_flags |= _PR_UNIX_POLL_EXCEPT;
+ }
+ if (in_flags) {
+ unixpd->osfd = osfd;
+ unixpd->in_flags = in_flags;
+ unixpd->out_flags = 0;
+ unixpd++;
+ pdcnt++;
+ }
+ }
+
+ /*
+ * see comments in mozilla/cmd/xfe/mozilla.c (look for
+ * "PR_XGetXtHackFD")
+ */
+ {
+ int needToLockXAgain;
+
+ needToLockXAgain = 0;
+ if (rd && (_pr_xt_hack_fd != -1)
+ && FD_ISSET(_pr_xt_hack_fd, rd) && PR_XIsLocked()
+ && (!_pr_xt_hack_okayToReleaseXLock
+ || _pr_xt_hack_okayToReleaseXLock())) {
+ PR_XUnlock();
+ needToLockXAgain = 1;
+ }
+
+ /* This is the potentially blocking step */
+ retVal = _PR_WaitForMultipleFDs(unixpds, pdcnt, timeout);
+
+ if (needToLockXAgain) {
+ PR_XLock();
+ }
+ }
+
+ if (retVal > 0) {
+ /* Compute select results */
+ if (rd) ZAP_SET(rd, width);
+ if (wr) ZAP_SET(wr, width);
+ if (ex) ZAP_SET(ex, width);
+
+ /*
+ * The return value can be either the number of ready file
+ * descriptors or the number of set bits in the three fd_set's.
+ */
+ retVal = 0; /* we're going to recompute */
+ eunixpd = unixpds + pdcnt;
+ for (unixpd = unixpds; unixpd < eunixpd; unixpd++) {
+ if (unixpd->out_flags) {
+ int nbits = 0; /* The number of set bits on for this fd */
+
+ if (unixpd->out_flags & _PR_UNIX_POLL_NVAL) {
+ errno = EBADF;
+ PR_LOG(_pr_io_lm, PR_LOG_ERROR,
+ ("select returns EBADF for %d", unixpd->osfd));
+ retVal = -1;
+ break;
+ }
+ /*
+ * If a socket has a pending error, it is considered
+ * both readable and writable. (See W. Richard Stevens,
+ * Unix Network Programming, Vol. 1, 2nd Ed., Section 6.3,
+ * pp. 153-154.) We also consider a socket readable if
+ * it has a hangup condition.
+ */
+ if (rd && (unixpd->in_flags & _PR_UNIX_POLL_READ)
+ && (unixpd->out_flags & (_PR_UNIX_POLL_READ
+ | _PR_UNIX_POLL_ERR | _PR_UNIX_POLL_HUP))) {
+ FD_SET(unixpd->osfd, rd);
+ nbits++;
+ }
+ if (wr && (unixpd->in_flags & _PR_UNIX_POLL_WRITE)
+ && (unixpd->out_flags & (_PR_UNIX_POLL_WRITE
+ | _PR_UNIX_POLL_ERR))) {
+ FD_SET(unixpd->osfd, wr);
+ nbits++;
+ }
+ if (ex && (unixpd->in_flags & _PR_UNIX_POLL_WRITE)
+ && (unixpd->out_flags & PR_POLL_EXCEPT)) {
+ FD_SET(unixpd->osfd, ex);
+ nbits++;
+ }
+ PR_ASSERT(nbits > 0);
+#if defined(HPUX) || defined(SOLARIS) || defined(OSF1) || defined(AIX)
+ retVal += nbits;
+#else /* IRIX */
+ retVal += 1;
+#endif
+ }
+ }
+ }
+
+ PR_ASSERT(tv || retVal != 0);
+ PR_LOG(_pr_io_lm, PR_LOG_MIN, ("select returns %d", retVal));
+ PR_DELETE(unixpds);
+
+ return retVal;
+}
+
+/*
+ * Redefine poll, when supported on platforms, for local threads
+ */
+
+/*
+ * I am commenting out the poll() wrapper for Linux for now
+ * because it is difficult to define _MD_POLL that works on all
+ * Linux varieties. People reported that glibc 2.0.7 on Debian
+ * 2.0 Linux machines doesn't have the __syscall_poll symbol
+ * defined. (WTC 30 Nov. 1998)
+ */
+#if defined(_PR_POLL_AVAILABLE) && !defined(LINUX)
+
+/*
+ *-----------------------------------------------------------------------
+ * poll() --
+ *
+ * RETURN VALUES:
+ * -1: fails, errno indicates the error.
+ * 0: timed out, the revents bitmasks are not set.
+ * positive value: the number of file descriptors for which poll()
+ * has set the revents bitmask.
+ *
+ *-----------------------------------------------------------------------
+ */
+
+#include <poll.h>
+
+#if defined(AIX_RENAME_SELECT)
+int wrap_poll(void *listptr, unsigned long nfds, long timeout)
+#elif (defined(AIX) && !defined(AIX_RENAME_SELECT))
+int poll(void *listptr, unsigned long nfds, long timeout)
+#elif defined(OSF1) || (defined(HPUX) && !defined(HPUX9))
+int poll(struct pollfd filedes[], unsigned int nfds, int timeout)
+#elif defined(HPUX9)
+int poll(struct pollfd filedes[], int nfds, int timeout)
+#elif defined(NETBSD)
+int poll(struct pollfd *filedes, nfds_t nfds, int timeout)
+#elif defined(OPENBSD)
+int poll(struct pollfd filedes[], nfds_t nfds, int timeout)
+#elif defined(FREEBSD)
+int poll(struct pollfd *filedes, unsigned nfds, int timeout)
+#else
+int poll(struct pollfd *filedes, unsigned long nfds, int timeout)
+#endif
+{
+#ifdef AIX
+ struct pollfd *filedes = (struct pollfd *) listptr;
+#endif
+ struct pollfd *pfd, *epfd;
+ _PRUnixPollDesc *unixpds, *unixpd, *eunixpd;
+ PRIntervalTime ticks;
+ PRInt32 pdcnt;
+ int ready;
+
+ /*
+ * Easy special case: zero timeout. Simply call the native
+ * poll() with no fear of blocking.
+ */
+ if (timeout == 0) {
+#if defined(AIX)
+ return _MD_POLL(listptr, nfds, timeout);
+#else
+ return _MD_POLL(filedes, nfds, timeout);
+#endif
+ }
+
+ if (!_pr_initialized) {
+ _PR_ImplicitInitialization();
+ }
+
+#ifndef _PR_LOCAL_THREADS_ONLY
+ if (_PR_IS_NATIVE_THREAD(_PR_MD_CURRENT_THREAD())) {
+ return _MD_POLL(filedes, nfds, timeout);
+ }
+#endif
+
+ /* We do not support the pollmsg structures on AIX */
+#ifdef AIX
+ PR_ASSERT((nfds & 0xff00) == 0);
+#endif
+
+ if (timeout < 0 && timeout != -1) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* Convert timeout from miliseconds to ticks */
+ if (timeout == -1) {
+ ticks = PR_INTERVAL_NO_TIMEOUT;
+ } else {
+ ticks = PR_MillisecondsToInterval(timeout);
+ }
+
+ /* Check for no descriptor case (just do a timeout) */
+ if (nfds == 0) {
+ PR_Sleep(ticks);
+ return 0;
+ }
+
+ unixpds = (_PRUnixPollDesc *)
+ PR_MALLOC(nfds * sizeof(_PRUnixPollDesc));
+ if (NULL == unixpds) {
+ errno = EAGAIN;
+ return -1;
+ }
+
+ pdcnt = 0;
+ epfd = filedes + nfds;
+ unixpd = unixpds;
+ for (pfd = filedes; pfd < epfd; pfd++) {
+ /*
+ * poll() ignores negative fd's.
+ */
+ if (pfd->fd >= 0) {
+ unixpd->osfd = pfd->fd;
+#ifdef _PR_USE_POLL
+ unixpd->in_flags = pfd->events;
+#else
+ /*
+ * Map the poll events to one of the three that can be
+ * represented by the select fd_sets:
+ * POLLIN, POLLRDNORM ===> readable
+ * POLLOUT, POLLWRNORM ===> writable
+ * POLLPRI, POLLRDBAND ===> exception
+ * POLLNORM, POLLWRBAND (and POLLMSG on some platforms)
+ * are ignored.
+ *
+ * The output events POLLERR and POLLHUP are never turned on.
+ * POLLNVAL may be turned on.
+ */
+ unixpd->in_flags = 0;
+ if (pfd->events & (POLLIN
+#ifdef POLLRDNORM
+ | POLLRDNORM
+#endif
+ )) {
+ unixpd->in_flags |= _PR_UNIX_POLL_READ;
+ }
+ if (pfd->events & (POLLOUT
+#ifdef POLLWRNORM
+ | POLLWRNORM
+#endif
+ )) {
+ unixpd->in_flags |= _PR_UNIX_POLL_WRITE;
+ }
+ if (pfd->events & (POLLPRI
+#ifdef POLLRDBAND
+ | POLLRDBAND
+#endif
+ )) {
+ unixpd->in_flags |= PR_POLL_EXCEPT;
+ }
+#endif /* _PR_USE_POLL */
+ unixpd->out_flags = 0;
+ unixpd++;
+ pdcnt++;
+ }
+ }
+
+ ready = _PR_WaitForMultipleFDs(unixpds, pdcnt, ticks);
+ if (-1 == ready) {
+ if (PR_GetError() == PR_PENDING_INTERRUPT_ERROR) {
+ errno = EINTR; /* XXX we aren't interrupted by a signal, but... */
+ } else {
+ errno = PR_GetOSError();
+ }
+ }
+ if (ready <= 0) {
+ goto done;
+ }
+
+ /*
+ * Copy the out_flags from the _PRUnixPollDesc structures to the
+ * user's pollfd structures and free the allocated memory
+ */
+ unixpd = unixpds;
+ for (pfd = filedes; pfd < epfd; pfd++) {
+ pfd->revents = 0;
+ if (pfd->fd >= 0) {
+#ifdef _PR_USE_POLL
+ pfd->revents = unixpd->out_flags;
+#else
+ if (0 != unixpd->out_flags) {
+ if (unixpd->out_flags & _PR_UNIX_POLL_READ) {
+ if (pfd->events & POLLIN) {
+ pfd->revents |= POLLIN;
+ }
+#ifdef POLLRDNORM
+ if (pfd->events & POLLRDNORM) {
+ pfd->revents |= POLLRDNORM;
+ }
+#endif
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_WRITE) {
+ if (pfd->events & POLLOUT) {
+ pfd->revents |= POLLOUT;
+ }
+#ifdef POLLWRNORM
+ if (pfd->events & POLLWRNORM) {
+ pfd->revents |= POLLWRNORM;
+ }
+#endif
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_EXCEPT) {
+ if (pfd->events & POLLPRI) {
+ pfd->revents |= POLLPRI;
+ }
+#ifdef POLLRDBAND
+ if (pfd->events & POLLRDBAND) {
+ pfd->revents |= POLLRDBAND;
+ }
+#endif
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_ERR) {
+ pfd->revents |= POLLERR;
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_NVAL) {
+ pfd->revents |= POLLNVAL;
+ }
+ if (unixpd->out_flags & _PR_UNIX_POLL_HUP) {
+ pfd->revents |= POLLHUP;
+ }
+ }
+#endif /* _PR_USE_POLL */
+ unixpd++;
+ }
+ }
+
+done:
+ PR_DELETE(unixpds);
+ return ready;
+}
+
+#endif /* !defined(LINUX) */
+
+#endif /* defined(_PR_PTHREADS) || defined(_PR_GLOBAL_THREADS_ONLY) */
+
+/* uxwrap.c */
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 21:21:13 +0000