sgx_urts/src/env.rs

// Copyright (C) 2017-2019 Baidu, Inc. All Rights Reserved.
//
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// modification, are permitted provided that the following conditions
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//
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//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in
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//    distribution.
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use std::io::Error;
use libc::{self, c_char, c_int};

#[no_mangle]
pub extern "C" fn u_environ_ocall() -> * const * const c_char {
    extern { static environ: * const * const c_char; }
    unsafe { environ }
}

#[no_mangle]
pub extern "C" fn u_getenv_ocall(name: * const c_char) -> * const c_char {
    unsafe { libc::getenv(name) }
}

#[no_mangle]
pub extern "C" fn u_setenv_ocall(error: * mut c_int,
                                 name: * const c_char,
                                 value: * const c_char,
                                 overwrite: c_int) -> c_int {
    let mut errno = 0;
    let ret = unsafe { libc::setenv(name, value, overwrite) };
    if ret < 0 {
        errno = Error::last_os_error().raw_os_error().unwrap_or(0);
    }
    if !error.is_null() {
        unsafe { *error = errno; }
    }
    ret
}

#[no_mangle]
pub extern "C" fn u_unsetenv_ocall(error: * mut c_int, name: * const c_char) -> c_int {
    let mut errno = 0;
    let ret = unsafe { libc::unsetenv(name) };
    if ret < 0 {
        errno = Error::last_os_error().raw_os_error().unwrap_or(0);
    }
    if !error.is_null() {
        unsafe { *error = errno; }
    }
    ret
}