libc.rs

pub use libc::*;

// OHOS musl libc does not export the `execveat` dynamic symbol, and the `libc`
// crate (0.2.x) only declares the binding under glibc. Provide a syscall-backed
// shim so the LD_PRELOAD interceptor's compile-time signature check and the
// fallthrough call site both resolve. `SYS_execveat` is reliably defined for
// aarch64-unknown-linux-ohos; the preflight `c2_sys_execveat` probe verifies
// the syscall works on both ci-runner and HarmonyOS userspace.
#[cfg(target_env = "ohos")]
pub unsafe extern "C" fn execveat(
    dirfd: c_int,
    pathname: *const c_char,
    argv: *const *mut c_char,
    envp: *const *mut c_char,
    flags: c_int,
) -> c_int {
    // SAFETY: the caller upholds POSIX execveat preconditions on the pointers;
    // libc::syscall is the only stable way to invoke this on OHOS musl
    unsafe {
        libc::syscall(libc::SYS_execveat, dirfd, pathname, argv, envp, flags) as c_int
    }
}

unsafe extern "C" {
    // On macOS x86_64, directory functions use $INODE64 symbol suffix for 64-bit inode support.
    // On arm64, 64-bit inodes are the only option so no suffix is needed.
    // https://github.com/apple-open-source-mirror/Libc/blob/5e566be7a7047360adfb35ffc44c6a019a854bea/include/dirent.h#L198
    #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"), link_name = "scandir$INODE64")]
    pub unsafe fn scandir(
        dirname: *const c_char,
        namelist: *mut c_void,
        select: *const c_void,
        compar: *const c_void,
    ) -> c_int;

    #[cfg(target_os = "macos")]
    #[cfg_attr(target_arch = "x86_64", link_name = "scandir_b$INODE64")]
    pub unsafe fn scandir_b(
        dirname: *const c_char,
        namelist: *mut c_void,
        select: *const c_void,
        compar: *const c_void,
    ) -> c_int;

    pub unsafe fn getdirentries(
        fd: c_int,
        buf: *mut c_char,
        nbytes: c_int,
        basep: *mut c_long,
    ) -> c_int;
}