f2a7f83595
Add support for getenv as defined by the Open Group's "System Interface & Header" in https://pubs.opengroup.org/onlinepubs/7908799/xsh/getenv.html getenv requires a standard way of accessing the environment, so a pointer to the environment is added to the startup in crt1. Consquently, this function is not usable on top of other libcs. Added starts_with method to StringView. getenv function uses it. Co-authored-by: Jeff Bailey <jeffbailey@google.com> Reviewed By: sivachandra, rtenneti Differential Revision: https://reviews.llvm.org/D119403
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
//===-- Classes to capture properites of linux applications -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_CONFIG_LINUX_APP_H
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#define LLVM_LIBC_CONFIG_LINUX_APP_H
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#include <stdint.h>
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namespace __llvm_libc {
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// Data structure to capture properties of the linux/ELF TLS.
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struct TLS {
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// The load address of the TLS.
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uintptr_t address;
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// The bytes size of the TLS.
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uintptr_t size;
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// The alignment of the TLS layout. It assumed that the alignment
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// value is a power of 2.
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uintptr_t align;
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};
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// Data structure which captures properties of a linux application.
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struct AppProperties {
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// Page size used for the application.
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uintptr_t pageSize;
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// The properties of an application's TLS.
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TLS tls;
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// Environment data.
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uint64_t *envPtr;
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};
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extern AppProperties app;
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// Creates and initializes the TLS area for the current thread. Should not
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// be called before app.tls has been initialized.
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void initTLS();
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_CONFIG_LINUX_APP_H
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