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Use more LFS functions.

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On Linux, use mmap64, open64, openat64, and sendfile64 in place of their
non-LFS counterparts.

This is relevant to #94173.

With these changes (together with rust-lang/backtrace-rs#501), the
simple binaries I produce with rustc seem to have no non-LFS functions,
so maybe #94173 is fixed. But I can't be sure if I've missed something
and maybe some non-LFS functions could sneak in somehow.
This commit is contained in:
Michael Benfield
2022-12-06 20:58:33 +00:00
parent 01fbc5ae78
commit 27011b4185
5 changed files with 31 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
library/std/src/sys/unix/stack_overflow.rs
View File

@@ -45,7 +45,10 @@ mod imp {
use crate::thread;
use libc::MAP_FAILED;
use libc::{mmap, munmap};
#[cfg(not(target_os = "linux"))]
use libc::{mmap as mmap64, munmap};
#[cfg(target_os = "linux")]
use libc::{mmap64, munmap};
use libc::{sigaction, sighandler_t, SA_ONSTACK, SA_SIGINFO, SIGBUS, SIG_DFL};
use libc::{sigaltstack, SIGSTKSZ, SS_DISABLE};
use libc::{MAP_ANON, MAP_PRIVATE, PROT_NONE, PROT_READ, PROT_WRITE, SIGSEGV};
@@ -135,7 +138,7 @@ mod imp {
#[cfg(not(any(target_os = "openbsd", target_os = "netbsd", target_os = "linux",)))]
let flags = MAP_PRIVATE | MAP_ANON;
let stackp =
mmap(ptr::null_mut(), SIGSTKSZ + page_size(), PROT_READ | PROT_WRITE, flags, -1, 0);
mmap64(ptr::null_mut(), SIGSTKSZ + page_size(), PROT_READ | PROT_WRITE, flags, -1, 0);
if stackp == MAP_FAILED {
panic!("failed to allocate an alternative stack: {}", io::Error::last_os_error());
}