Memory Management

mmap

Supported functionality in SCML:

prot = PROT_NONE |
    PROT_EXEC |
    PROT_READ |
    PROT_WRITE;
opt_flags =
    MAP_ANONYMOUS |
    MAP_FIXED |
    MAP_FIXED_NOREPLACE |
    MAP_GROWSDOWN |
    MAP_HUGETLB |
    MAP_LOCKED |
    MAP_NONBLOCK |
    MAP_NORESERVE |
    MAP_POPULATE |
    MAP_SYNC;

// Create a private memory mapping
mmap(
    addr, length,
    prot = <prot>, 
    flags = MAP_PRIVATE | <opt_flags>
    fd, offset
);
    
// Create a shared memory mapping
mmap(
    addr, length,
    prot = <prot>, 
    flags = MAP_SHARED | MAP_SHARED_VALIDATE | <opt_flags>
    fd, offset
);

Silently-ignored flags:

• MAP_HUGETLB
• MAP_GROWSDOWN
• MAP_LOCKED
• MAP_NONBLOCK
• MAP_NORESERVE
• MAP_POPULATE
• MAP_SYNC

Partially supported flags:

• MAP_FIXED_NOREPLACE is treated as MAP_FIXED

Unsupported flags:

• MAP_32BIT
• MAP_HUGE_1GB
• MAP_HUGE_2MB
• MAP_UNINITIALIZED

For more information, see the man page.