mirror of
https://git.freebsd.org/ports.git
synced 2025-05-19 18:43:13 -04:00
85 lines
4 KiB
C
85 lines
4 KiB
C
based on https://github.com/dankamongmen/libdank/blob/master/libdank/compat-FreeBSD.c
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--- ./usb_stream/pcm_usb_stream.c.orig 2022-03-17 16:51:58 UTC
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+++ ./usb_stream/pcm_usb_stream.c
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@@ -78,6 +78,69 @@
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static struct user_usb_stream *uus;
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static pthread_mutex_t uus_mutex = PTHREAD_MUTEX_INITIALIZER;
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+#ifndef __linux__
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+/*
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+ * Copyright (c) 2000-2011, Nick Black et al
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are met:
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * * Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * * Neither the name of Nick Black nor the names of other contributors may
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+ * be used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <copyright
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+ * holder> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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+ * POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+// This is suitable really only for use with libdank's mremap_and_ftruncate(),
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+// due to assumptions it makes about the flags to pass to mmap(2). The only
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+// mremap(2) use case addressed is that of MREMAP_MAYMOVE. oldaddr must be a
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+// valid previous return from mmap(); NULL is not acceptable (ala Linux's
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+// mremap(2)), resulting in undefined behavior, despite realloc(3) semantics.
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+// Similarly, oldlen and newlen must be non-zero (and page-aligned).
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+void *mremap_compat(int fd,void *oldaddr,size_t oldlen,
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+ size_t newlen,int prot,int flags){
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+ void *ret;
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+
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+ // From mmap(2) on freebsd 6.3: A successful FIXED mmap deletes any
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+ // previous mapping in the allocated address range. This means:
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+ // remapping over a current map will blow it away (unless FIXED isn't
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+ // provided, in which case it can't overlap an old mapping. See bug
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+ // 733 for extensive discussion of this issue for Linux and FreeBSD).
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+ if((ret = mmap((char *)oldaddr + oldlen,newlen - oldlen,prot,flags,fd,oldlen)) == MAP_FAILED){
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+ // We couldn't get the memory whatsoever (or we were a fresh
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+ // allocation that succeeded). Return the immediate result...
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+ return ret;
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+ } // ret != MAP_FAILED. Did we squash?
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+ if(ret != (char *)oldaddr + oldlen){
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+ // We got the memory, but not where we wanted it. Copy over the
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+ // old map, and then free it up...
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+ munmap(ret,newlen - oldlen);
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+ if((ret = mmap(NULL,newlen,prot,flags,fd,0)) == MAP_FAILED){
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+ return ret;
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+ }
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+ memcpy(ret,oldaddr,oldlen);
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+ munmap(oldaddr,oldlen); // Free the old mapping
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+ return ret;
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+ } // We successfully squashed. Return a pointer to the first buf.
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+ return oldaddr;
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+}
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+#endif
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+
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static struct user_usb_stream *get_uus(int card)
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{
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pthread_mutex_lock(&uus_mutex);
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@@ -218,7 +281,11 @@
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}
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+#ifdef __linux__
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uus->s = mremap(uus->s, sizeof(struct usb_stream), uus->s->read_size, MREMAP_MAYMOVE);
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+#else
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+ uus->s = mremap_compat(us->pfd.fd, uus->s, sizeof(struct usb_stream), uus->s->read_size, PROT_READ, MAP_SHARED);
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+#endif
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if (MAP_FAILED == uus->s) {
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perror("ALSA/USX2Y: mmap");
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return -EPERM;
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