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bbedward
29 lines
717 B
Go
29 lines
717 B
Go
package shm
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import (
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"unsafe"
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"golang.org/x/sys/unix"
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)
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// Mirrors FreeBSD libc memfd_create (lib/libc/gen/memfd_create.c):
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// shm_open2(SHM_ANON, O_RDWR, 0, SHM_GROW_ON_WRITE, name).
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// x/sys/unix has no wrapper for SYS_shm_open2 (571, sys/sys/syscall.h).
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const (
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sysShmOpen2 = 571
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shmAnon = 1 // SHM_ANON ((char *)1), sys/sys/mman.h
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shmGrowOnWrite = 0x2 // SHM_GROW_ON_WRITE, sys/sys/mman.h
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)
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func CreateAnonFd(name string) (int, error) {
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p, err := unix.BytePtrFromString(name)
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if err != nil {
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return -1, err
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}
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fd, _, errno := unix.Syscall6(sysShmOpen2, shmAnon, unix.O_RDWR, 0, shmGrowOnWrite, uintptr(unsafe.Pointer(p)), 0)
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if errno != 0 {
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return -1, errno
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}
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return int(fd), nil
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}
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