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move around some libc code

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Folkert 2022-10-18 00:20:01 +02:00
parent c5cdab1ff9
commit 84178c66e1
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1 changed files with 8 additions and 8 deletions
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12
crates/repl_expect/src/run.rs
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@ -57,15 +57,10 @@ impl<'a> ExpectMemory<'a> {
internal_error!("failed to shm_open fd"); internal_error!("failed to shm_open fd");
} }
let mut stat: libc::stat = std::mem::zeroed(); // NOTE: we can only call `ftruncate` once on this file descriptor on mac
if libc::fstat(shared_fd, &mut stat) == -1 {
internal_error!("failed to stat shared file, does it exist?");
}
if stat.st_size < Self::SHM_SIZE as _ {
if libc::ftruncate(shared_fd, Self::SHM_SIZE as _) == -1 { if libc::ftruncate(shared_fd, Self::SHM_SIZE as _) == -1 {
internal_error!("failed to truncate shared file, are the permissions wrong?"); internal_error!("failed to truncate shared file, are the permissions wrong?");
} }
}
let ptr = libc::mmap( let ptr = libc::mmap(
std::ptr::null_mut(), std::ptr::null_mut(),
@ -75,10 +70,15 @@ impl<'a> ExpectMemory<'a> {
shared_fd, shared_fd,
0, 0,
); );
if ptr as usize == usize::MAX { if ptr as usize == usize::MAX {
// ptr = -1 // ptr = -1
roc_error_macros::internal_error!("failed to mmap shared pointer") roc_error_macros::internal_error!("failed to mmap shared pointer")
} }
// fill the buffer with a fill pattern
libc::memset(ptr, 0xAA, Self::SHM_SIZE);
ptr ptr
}; };