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   mmap.3p    ( 3 )

карта страниц памяти (map pages of memory)

Возвращаемое значение (Return value)

Upon successful completion, the mmap() function shall return the
       address at which the mapping was placed (pa); otherwise, it shall
       return a value of MAP_FAILED and set errno to indicate the error.
       The symbol MAP_FAILED is defined in the <sys/mman.h> header. No
       successful return from mmap() shall return the value MAP_FAILED.