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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "pal_common.h"
#include <dlfcn.h>
#include <string.h>
#if HAVE_GNU_LIBNAMES_H
#include <gnu/lib-names.h>
#endif
extern "C" void* CoreLibNative_LoadLibrary(const char* filename)
{
// Check whether we have been requested to load 'libc'. If that's the case, then:
// * For Linux, use the full name of the library that is defined in <gnu/lib-names.h> by the
// LIBC_SO constant. The problem is that calling dlopen("libc.so") will fail for libc even
// though it works for other libraries. The reason is that libc.so is just linker script
// (i.e. a test file).
// As a result, we have to use the full name (i.e. lib.so.6) that is defined by LIBC_SO.
// * For macOS, use constant value absolute path "/usr/lib/libc.dylib".
// * For FreeBSD, use constant value "libc.so.7".
// * For rest of Unices, use constant value "libc.so".
if (strcmp(filename, "libc") == 0)
{
#if defined(__APPLE__)
filename = "/usr/lib/libc.dylib";
#elif defined(__FreeBSD__)
filename = "libc.so.7";
#elif defined(LIBC_SO)
filename = LIBC_SO;
#else
filename = "libc.so";
#endif
}
return dlopen(filename, RTLD_LAZY);
}
extern "C" void* CoreLibNative_GetProcAddress(void* handle, const char* symbol)
{
// We're not trying to disambiguate between "symbol was not found" and "symbol found, but
// the value is null". .NET does not define a behavior for DllImports of null entrypoints,
// so we might as well take the "not found" path on the managed side.
return dlsym(handle, symbol);
}
extern "C" void CoreLibNative_FreeLibrary(void* handle)
{
dlclose(handle);
}
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