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Only ftruncate shm_open'd file once, and add some error messages

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This commit is contained in:
Ayaz Hafiz 2022-10-17 09:45:34 -05:00
parent e6fd0c62fd
commit c5cdab1ff9
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3 changed files with 22 additions and 4 deletions
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24
crates/repl_expect/src/run.rs
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@ -5,6 +5,7 @@ use bumpalo::Bump;
use inkwell::context::Context;
use roc_build::link::llvm_module_to_dylib;
use roc_collections::{MutSet, VecMap};
use roc_error_macros::internal_error;
use roc_gen_llvm::{
llvm::{build::LlvmBackendMode, externs::add_default_roc_externs},
run_roc::RocCallResult,
@ -52,18 +53,33 @@ impl<'a> ExpectMemory<'a> {
fn mmap_help(cstring: std::ffi::CString, shm_flags: i32) -> Self {
let ptr = unsafe {
let shared_fd = libc::shm_open(cstring.as_ptr().cast(), shm_flags, 0o666);
if shared_fd == -1 {
internal_error!("failed to shm_open fd");
}
libc::ftruncate(shared_fd, 0);
libc::ftruncate(shared_fd, Self::SHM_SIZE as _);
let mut stat: libc::stat = std::mem::zeroed();
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 {
internal_error!("failed to truncate shared file, are the permissions wrong?");
}
}
libc::mmap(
let ptr = libc::mmap(
std::ptr::null_mut(),
Self::SHM_SIZE,
libc::PROT_WRITE | libc::PROT_READ,
libc::MAP_SHARED,
shared_fd,
0,
)
);
if ptr as usize == usize::MAX {
// ptr = -1
roc_error_macros::internal_error!("failed to mmap shared pointer")
}
ptr
};
// puts in the initial header