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#if defined(OS_LINUX)
#include "hasLinuxCapability.h"
#include <syscall.h>
#include <unistd.h>
#include <linux/capability.h>
#include <Common/Exception.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NETLINK_ERROR;
}
static __user_cap_data_struct getCapabilities()
{
/// See man getcap.
__user_cap_header_struct request{};
request.version = _LINUX_CAPABILITY_VERSION_1; /// It's enough to check just single CAP_NET_ADMIN capability we are interested.
request.pid = getpid();
__user_cap_data_struct response{};
/// Avoid dependency on 'libcap'.
if (0 != syscall(SYS_capget, &request, &response))
throwFromErrno("Cannot do 'capget' syscall", ErrorCodes::NETLINK_ERROR);
return response;
}
bool hasLinuxCapability(int cap)
{
static __user_cap_data_struct capabilities = getCapabilities();
return (1 << cap) & capabilities.effective;
}
}
#endif
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