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mman.c - portable mmap/munmap function for skyeye on BeOS
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Copyright (C) 2007 Anthony Lee <don.anthony.lee+program@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* 04/12/2007 Written by Anthony Lee
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#include <sys/types.h>
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#include <kernel/OS.h>
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#include "portable/mman.h"
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void* mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
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ssize_t nBytes = 0, nRead;
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if ((flags & (MAP_FIXED | MAP_SHARED)) ||
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((prot & PROT_WRITE) && fd != -1) ||
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length == 0) return MAP_FAILED;
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length = (length + (B_PAGE_SIZE - 1)) & ~(B_PAGE_SIZE - 1);
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if ((area = create_area("none", &retVal, B_ANY_ADDRESS,
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B_READ_AREA | B_WRITE_AREA)) < 0) return MAP_FAILED;
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if (fstat(fd, &stat) != 0 ||
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offset >= stat.st_size ||
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lseek(fd, offset, SEEK_SET) == (off_t)-1) goto err;
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while (nBytes < (ssize_t)length) {
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offset = lseek(fd, 0, SEEK_CUR);
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if (offset == (off_t)-1 || offset >= stat.st_size) break;
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nRead = read(fd, (void*)((char*)retVal + nBytes), length);
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if (nBytes == -1) goto err;
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return (retVal == NULL ? MAP_FAILED : retVal);
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int munmap(void *addr, size_t length)
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if (addr == NULL || addr == MAP_FAILED) return -1;
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if ((area = area_for(addr)) < 0) return -1;
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return (delete_area(area) != B_OK ? -1 : 0);