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https://github.com/kovidgoyal/kitty
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2e4f3dab41
With truncate() the OS might not actually allocate the space leading to a SIGBUS if /dev/shm runs out of space when actually using the mmap. By using fallocate we ensure that once the SHM mmap is created it wont fail
30 lines
568 B
Go
30 lines
568 B
Go
// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
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package shm
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import (
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"fmt"
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"syscall"
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"unsafe"
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)
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var _ = fmt.Print
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func Fallocate_simple(fd int, size int64) (err error) {
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store := &syscall.Fstore_t{
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Flags: syscall.F_ALLOCATEALL,
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Posmode: syscall.F_PEOFPOSMODE,
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Offset: 0,
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Length: int64(size),
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}
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for {
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if _, _, err = syscall.Syscall(syscall.SYS_FCNTL, uintptr(out.f.Fd()), syscall.F_PREALLOCATE, uintptr(unsafe.Pointer(store))); !errors.Is(err, unix.EINTR) {
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if err != 0 {
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return err
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}
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return nil
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}
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}
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}
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