/* $NetBSD: resource.c,v 1.2.4.2 2024/02/29 12:35:03 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #include #include #include #include /* Required on some systems for . */ #include #include #include #include #ifdef __linux__ #include /* To get the large NR_OPEN. */ #endif /* ifdef __linux__ */ #include "errno2result.h" static isc_result_t resource2rlim(isc_resource_t resource, int *rlim_resource) { isc_result_t result = ISC_R_SUCCESS; switch (resource) { case isc_resource_coresize: *rlim_resource = RLIMIT_CORE; break; case isc_resource_cputime: *rlim_resource = RLIMIT_CPU; break; case isc_resource_datasize: *rlim_resource = RLIMIT_DATA; break; case isc_resource_filesize: *rlim_resource = RLIMIT_FSIZE; break; case isc_resource_lockedmemory: #ifdef RLIMIT_MEMLOCK *rlim_resource = RLIMIT_MEMLOCK; #else /* ifdef RLIMIT_MEMLOCK */ result = ISC_R_NOTIMPLEMENTED; #endif /* ifdef RLIMIT_MEMLOCK */ break; case isc_resource_openfiles: #ifdef RLIMIT_NOFILE *rlim_resource = RLIMIT_NOFILE; #else /* ifdef RLIMIT_NOFILE */ result = ISC_R_NOTIMPLEMENTED; #endif /* ifdef RLIMIT_NOFILE */ break; case isc_resource_processes: #ifdef RLIMIT_NPROC *rlim_resource = RLIMIT_NPROC; #else /* ifdef RLIMIT_NPROC */ result = ISC_R_NOTIMPLEMENTED; #endif /* ifdef RLIMIT_NPROC */ break; case isc_resource_residentsize: #ifdef RLIMIT_RSS *rlim_resource = RLIMIT_RSS; #else /* ifdef RLIMIT_RSS */ result = ISC_R_NOTIMPLEMENTED; #endif /* ifdef RLIMIT_RSS */ break; case isc_resource_stacksize: *rlim_resource = RLIMIT_STACK; break; default: /* * This test is not very robust if isc_resource_t * changes, but generates a clear assertion message. */ REQUIRE(resource >= isc_resource_coresize && resource <= isc_resource_stacksize); result = ISC_R_RANGE; break; } return (result); } isc_result_t isc_resource_setlimit(isc_resource_t resource, isc_resourcevalue_t value) { struct rlimit rl; rlim_t rlim_value; int unixresult; int unixresource; isc_result_t result; result = resource2rlim(resource, &unixresource); if (result != ISC_R_SUCCESS) { return (result); } if (value == ISC_RESOURCE_UNLIMITED) { rlim_value = RLIM_INFINITY; } else { /* * isc_resourcevalue_t was chosen as an unsigned 64 bit * integer so that it could contain the maximum range of * reasonable values. Unfortunately, this exceeds the typical * range on Unix systems. Ensure the range of * rlim_t is not overflowed. */ isc_resourcevalue_t rlim_max; bool rlim_t_is_signed = (((double)(rlim_t)-1) < 0); if (rlim_t_is_signed) { rlim_max = ~((rlim_t)1 << (sizeof(rlim_t) * 8 - 1)); } else { rlim_max = (rlim_t)-1; } if (value > rlim_max) { value = rlim_max; } rlim_value = value; } rl.rlim_cur = rl.rlim_max = rlim_value; unixresult = setrlimit(unixresource, &rl); if (unixresult == 0) { return (ISC_R_SUCCESS); } #if defined(OPEN_MAX) && defined(__APPLE__) /* * The Darwin kernel doesn't accept RLIM_INFINITY for rlim_cur; the * maximum possible value is OPEN_MAX. BIND8 used to use * sysconf(_SC_OPEN_MAX) for such a case, but this value is much * smaller than OPEN_MAX and is not really effective. */ if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) { rl.rlim_cur = OPEN_MAX; unixresult = setrlimit(unixresource, &rl); if (unixresult == 0) { return (ISC_R_SUCCESS); } } #elif defined(__linux__) #ifndef NR_OPEN #define NR_OPEN (1024 * 1024) #endif /* ifndef NR_OPEN */ /* * Some Linux kernels don't accept RLIM_INFINIT; the maximum * possible value is the NR_OPEN defined in linux/fs.h. */ if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) { rl.rlim_cur = rl.rlim_max = NR_OPEN; unixresult = setrlimit(unixresource, &rl); if (unixresult == 0) { return (ISC_R_SUCCESS); } } #endif /* if defined(OPEN_MAX) && defined(__APPLE__) */ if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) { if (getrlimit(unixresource, &rl) == 0) { rl.rlim_cur = rl.rlim_max; unixresult = setrlimit(unixresource, &rl); if (unixresult == 0) { return (ISC_R_SUCCESS); } } } return (isc__errno2result(errno)); } isc_result_t isc_resource_getlimit(isc_resource_t resource, isc_resourcevalue_t *value) { int unixresource; struct rlimit rl; isc_result_t result; result = resource2rlim(resource, &unixresource); if (result != ISC_R_SUCCESS) { return (result); } if (getrlimit(unixresource, &rl) != 0) { return (isc__errno2result(errno)); } *value = rl.rlim_max; return (ISC_R_SUCCESS); } isc_result_t isc_resource_getcurlimit(isc_resource_t resource, isc_resourcevalue_t *value) { int unixresource; struct rlimit rl; isc_result_t result; result = resource2rlim(resource, &unixresource); if (result != ISC_R_SUCCESS) { return (result); } if (getrlimit(unixresource, &rl) != 0) { return (isc__errno2result(errno)); } *value = rl.rlim_cur; return (ISC_R_SUCCESS); }