93 строки
2.9 KiB
C
93 строки
2.9 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "orte_config.h"
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#include "orte/orte_constants.h"
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#include "orte/orte_types.h"
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#include "opal/mca/base/mca_base_param.h"
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#include "opal/util/opal_environ.h"
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#include "opal/util/argv.h"
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#include "opal/util/output.h"
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#include "orte/mca/errmgr/errmgr.h"
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#include "orte/util/pre_condition_transports.h"
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#include <unistd.h>
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#include <sys/types.h>
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#include <fcntl.h>
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/* some network transports require a little bit of information to
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* "pre-condition" them - i.e., to setup their individual transport
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* connections so they can generate their endpoint addresses. This
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* function provides a means for doing so. The resulting info is placed
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* into the app_context's env array so it will automatically be pushed
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* into the environment of every MPI process when launched.
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*/
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static inline void orte_pre_condition_transports_use_rand(uint64_t* unique_key) {
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int pid;
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pid = getpid();
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srand(pid);
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unique_key[1] = rand();
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unique_key[2] = rand();
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}
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int orte_pre_condition_transports(orte_app_context_t **app_context, size_t num_context)
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{
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size_t i;
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char *cs_env;
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int fd_rand;
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uint64_t unique_key[2];
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char string_key[ORTE_TRANSPORT_KEY_LEN + 1]; /* key + null */
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size_t bytes_read;
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/* put the number here - or else create an appropriate string. this just needs to
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* eventually be a string variable
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*/
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if(-1 == (fd_rand = open("/dev/random", O_RDONLY | O_NONBLOCK))) {
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orte_pre_condition_transports_use_rand(unique_key);
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} else {
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bytes_read = read(fd_rand, (char *) unique_key, 16);
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if(bytes_read != 16) {
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orte_pre_condition_transports_use_rand(unique_key);
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} else {
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close(fd_rand);
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}
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}
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sprintf(string_key, ORTE_TRANSPORT_KEY_FMT, unique_key[0], unique_key[1]);
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string_key[sizeof string_key - 1] = '\0';
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if (NULL == (cs_env = mca_base_param_environ_variable("orte_precondition_transports",NULL,NULL))) {
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ORTE_ERROR_LOG(ORTE_ERR_OUT_OF_RESOURCE);
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return ORTE_ERR_OUT_OF_RESOURCE;
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}
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for (i=0; i < num_context; i++) {
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opal_setenv(cs_env, string_key, true, &app_context[i]->env);
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}
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free(cs_env);
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return ORTE_SUCCESS;
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}
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