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shm: Add mmap+memmove fallback if mremap() does not exist

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Some operating systems (e.g. FreeBSD) do not implement mremap.
In that case we can grow the mapping by trying to map adjacent memory.
If that fails we can fall back to creating a new larger mapping and
moving the old memory contents there.

Co-authored-by: Koop Mast <kwm@rainbow-runner.nl>
Signed-off-by: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>
This commit is contained in:
Alex Richardson 2021-03-15 22:25:52 +00:00 • committed by Alexander Richardson
parent 54b237a612
commit 5a981ee823
4 changed files with 74 additions and 9 deletions
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4
src/wayland-os.h
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@ -47,6 +47,10 @@ wl_os_epoll_create_cloexec(void);
int
wl_os_accept_cloexec(int sockfd, struct sockaddr *addr, socklen_t *addrlen);
void *
wl_os_mremap_maymove(int fd, void *old_data, ssize_t *old_size,
ssize_t new_size, int prot, int flags);
/*
* The following are for wayland-os.c and the unit tests.