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//===-- Linux implementation of sigaltstack -------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/signal/sigaltstack.h"
#include "hdr/types/stack_t.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/signal/linux/signal_utils.h"
#include "src/__support/common.h"
#include <sys/syscall.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, sigaltstack,
(const stack_t *__restrict ss, stack_t *__restrict oss)) {
if (ss != nullptr) {
unsigned not_ss_disable = ~unsigned(SS_DISABLE);
if ((unsigned(ss->ss_flags) & not_ss_disable) != 0) {
// Flags cannot have anything other than SS_DISABLE set.
// We do the type-casting to unsigned because the |ss_flags|
// field of stack_t is of type "int".
libc_errno = EINVAL;
return -1;
}
if (ss->ss_size < MINSIGSTKSZ) {
libc_errno = ENOMEM;
return -1;
}
}
int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_sigaltstack, ss, oss);
if (ret < 0) {
libc_errno = -ret;
return -1;
}
return 0;
}
} // namespace LIBC_NAMESPACE_DECL
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