This is probably not the system call that you are interested in; instead, see
.BR mmap (2),
which describes the glibc wrapper function that invokes this system call.
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The
.BR mmap2 ()
system call provides the same interface as
wrapper function invokes this system call rather than the
.BR mmap (2)
system call.
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This system call does not exist on x86-64.
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On ia64, the unit for
.I offset
is actually the system page size, rather than 4096 bytes.