42 lines
941 B
C
42 lines
941 B
C
#include <unistd.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <stdint.h>
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#include <limits.h>
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#include "syscall.h"
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static void dummy(void) { }
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weak_alias(dummy, __vm_wait);
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#define UNIT SYSCALL_MMAP2_UNIT
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#define OFF_MASK ((-0x2000ULL << (8*sizeof(syscall_arg_t)-1)) | (UNIT-1))
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void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
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{
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long ret;
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if (off & OFF_MASK) {
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errno = EINVAL;
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return MAP_FAILED;
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}
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if (len >= PTRDIFF_MAX) {
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errno = ENOMEM;
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return MAP_FAILED;
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}
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if (flags & MAP_FIXED) {
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__vm_wait();
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}
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#ifdef SYS_mmap2
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ret = __syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT);
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#else
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ret = __syscall(SYS_mmap, start, len, prot, flags, fd, off);
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#endif
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/* Fixup incorrect EPERM from kernel. */
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if (ret == -EPERM && !start && (flags&MAP_ANON) && !(flags&MAP_FIXED))
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ret = -ENOMEM;
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return (void *)__syscall_ret(ret);
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}
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weak_alias(__mmap, mmap);
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weak_alias(mmap, mmap64);
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