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Can shared memory segments be resized?

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Can shared memory segments be resized?

Subject: Can shared memory segments be resized?
From: Stéphane Letz <email@hidden>
Date: Thu, 9 Dec 2004 13:11:11 +0100

Hi,

I am porting code from Linux that needs to resize shared memory segments. Basically the resize function does the following:

shm_fd = shm_open (name, O_RDWR, 0666)) ;

munmap (addr, old_size)

ftruncate (shm_fd, new_size);

mmap (0, new_size, PROT_READ|PROT_WRITE, MAP_SHARED, shm_fd, 0);

But the ftruncate call fails. ( I remember reading that ftruncate could only be used for new created memory segments)

Can shared memory segments be resized on Darwin?

Any idea how to implement this?

Thanks

Stephane letz


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