tdlight/tdutils/td/utils/port/rlimit.cpp
2022-01-01 03:35:39 +03:00

98 lines
2.4 KiB
C++

//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2022
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/utils/port/rlimit.h"
#include "td/utils/port/config.h"
#include "td/utils/misc.h"
#if TD_PORT_POSIX
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#endif
namespace td {
#if TD_PORT_POSIX
static int get_resource(ResourceLimitType type) {
switch (type) {
case ResourceLimitType::NoFile:
return RLIMIT_NOFILE;
default:
UNREACHABLE();
return -1;
}
}
#endif
Status set_resource_limit(ResourceLimitType type, uint64 value, uint64 max_value) {
#if TD_PORT_POSIX
if (max_value != 0 && value > max_value) {
return Status::Error("New resource limit value must not be bigger than max_value");
}
int resource = get_resource(type);
rlimit rlim;
if (getrlimit(resource, &rlim) == -1) {
return OS_ERROR("Failed to get current resource limit");
}
TRY_RESULT(new_value, narrow_cast_safe<rlim_t>(value));
TRY_RESULT(new_max_value, narrow_cast_safe<rlim_t>(max_value));
if (new_max_value) {
rlim.rlim_max = new_max_value;
} else if (rlim.rlim_max < new_value) {
rlim.rlim_max = new_value;
}
rlim.rlim_cur = new_value;
if (setrlimit(resource, &rlim) < 0) {
return OS_ERROR("Failed to set resource limit");
}
return Status::OK();
#elif TD_PORT_WINDOWS
return Status::OK(); // Windows has no limits
#endif
}
Status set_maximize_resource_limit(ResourceLimitType type, uint64 value) {
#if TD_PORT_POSIX
int resource = get_resource(type);
rlimit rlim;
if (getrlimit(resource, &rlim) == -1) {
return OS_ERROR("Failed to get current resource limit");
}
TRY_RESULT(new_value, narrow_cast_safe<rlim_t>(value));
if (rlim.rlim_max < new_value) {
// trying to increase rlim_max
rlimit new_rlim;
new_rlim.rlim_cur = new_value;
new_rlim.rlim_max = new_value;
if (setrlimit(resource, &new_rlim) >= 0) {
return Status::OK();
}
// do not increase rlim_max if have no rights
new_value = rlim.rlim_max;
}
rlim.rlim_cur = new_value;
if (setrlimit(resource, &rlim) < 0) {
return OS_ERROR("Failed to set resource limit");
}
return Status::OK();
#elif TD_PORT_WINDOWS
return Status::OK(); // Windows has no limits
#endif
}
} // namespace td