131 строка
4.5 KiB
C
131 строка
4.5 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University.
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* All rights reserved.
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* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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* All rights 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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/**
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* @file
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*
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* Generic helper routines for environment manipulation.
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*/
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#ifndef OPAL_ENVIRON_H
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#define OPAL_ENVIRON_H
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#include "ompi_config.h"
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#if defined(c_plusplus) || defined(__cplusplus)
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extern "C" {
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#endif
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/**
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* Merge two environ-like arrays into a single, new array, ensuring
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* that there are no duplicate entries.
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*
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* @param minor Set 1 of the environ's to merge
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* @param major Set 2 of the environ's to merge
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* @retval New array of environ
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*
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* Merge two environ-like arrays into a single, new array,
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* ensuring that there are no duplicate entires. If there are
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* duplicates, entries in the \em major array are favored over
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* those in the \em minor array.
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*
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* Both \em major and \em minor are expected to be argv-style
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* arrays (i.e., terminated with a NULL pointer).
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*
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* The array that is returned is an unencumbered array that should
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* later be freed with a call to opal_argv_free().
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*
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* Either (or both) of \em major and \em minor can be NULL. If
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* one of the two is NULL, the other list is simply copied to the
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* output. If both are NULL, NULL is returned.
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*/
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OMPI_DECLSPEC char **opal_environ_merge(char **minor, char **major);
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/**
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* Portable version of setenv(3), allowing editing of any
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* environ-like array.
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*
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* @param name String name of the environment variable to look for
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* @param value String value to set
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* @param overwrite Whether to overwrite any existing value with
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* the same name
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* @param env The environment to use
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*
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* @retval OMPI_ERR_OUT_OF_RESOURCE If internal malloc() fails.
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* @retval OMPI_EXISTS If the name already exists in \em env and
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* \em overwrite is false (and therefore the \em value was not
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* saved in \em env)
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* @retval OMPI_SUCESS If the value replaced another value or is
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* appended to \em env.
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*
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* \em env is expected to be a NULL-terminated array of pointers
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* (argv-style). Note that unlike some implementations of
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* putenv(3), if \em value is insertted in \em env, it is copied.
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* So the caller can modify/free both \em name and \em value after
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* opal_setenv() returns.
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*
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* The \em env array will be grown if necessary.
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*
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* It is permissable to invoke this function with the
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* system-defined \em environ variable. For example:
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*
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* \code
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* extern char **environ;
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* opal_setenv("foo", "bar", true, &environ);
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* \endcode
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*
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* NOTE: If you use the real environ, opal_setenv() will turn
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* around and perform putenv() to put the value in the
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* environment. This may very well lead to a memory leak, so its
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* use is strongly discouraged.
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*
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* It is also permissable to call this function with an empty \em
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* env, as long as it is pre-initialized with NULL:
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*
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* \code
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* char **my_env = NULL;
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* opal_setenv("foo", "bar", true, &my_env);
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* \endcode
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*/
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OMPI_DECLSPEC int opal_setenv(const char *name, const char *value,
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bool overwrite, char ***env);
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/**
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* Portable version of unsetenv(3), allowing editing of any
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* environ-like array.
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*
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* @param name String name of the environment variable to look for
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* @param env The environment to use
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*
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* @retval OMPI_ERR_OUT_OF_RESOURCE If an internal malloc fails.
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* @retval OMPI_ERR_NOT_FOUND If \em name is not found in \em env.
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* @retval OMPI_SUCCESS If \em name is found and successfully deleted.
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*
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* If \em name is found in \em env, the string corresponding to
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* that entry is freed and its entry is eliminated from the array.
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*/
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OMPI_DECLSPEC int opal_unsetenv(const char *name, char ***env);
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/**
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* So that others don't have to declare it
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*/
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OMPI_DECLSPEC extern char **opal_environ;
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#if defined(c_plusplus) || defined(__cplusplus)
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}
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#endif
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#endif /* OPAL_ENVIRON */
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