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Add environment variable function

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@294 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2007-06-30 19:39:17 +00:00
parent 0466636a01
commit 475e731751
12 changed files with 860 additions and 3 deletions
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2
ChangeLog
View File

@ -188,5 +188,7 @@
* Added basic OS support to manage environment variables: environment
storage, cloning on task creation, sharing on pthread creation, destruction
on thread/task exit.
* Add environment variables APIs: environ, getenv, putenv, clearenv, setenv,
unsetenv
* Started m68322

4
Documentation/NuttX.html
View File

@ -623,6 +623,10 @@ Other memory:
* Added basic OS support to manage environment variables: environment
storage, cloning on task creation, sharing on pthread creation, destruction
on thread/task exit.
* Add environment variables APIs: environ, getenv, putenv, clearenv, setenv,
unsetenv
* Add environment variables APIs: environ, getenv, putenv, clearenv, setenv,
unsetenv
* Started m68322
</pre></ul>

2
include/nuttx/sched.h
View File

@ -154,7 +154,7 @@ struct environ_s
unsigned int ev_crefs; /* Reference count used when environment
* is shared by threads */
size_t ev_alloc; /* Number of bytes allocated in environment */
ubyte ev_env[1]; /* Environment strings */
char ev_env[1]; /* Environment strings */
};
typedef struct environ_s environ_t;
# define SIZEOF_ENVIRON_T(alloc) (sizeof(environ_t) + alloc - 1)

3
sched/Makefile
View File

@ -56,7 +56,8 @@ SCHED_SRCS = sched_setparam.c sched_getparam.c \
sched_getprioritymax.c sched_getprioritymin.c \
sched_lock.c sched_unlock.c sched_lockcount.c
ENV_SRCS = env_getenvironptr.c env_dup.c env_share.c env_release.c \
env_clearenv.c
env_findvar.c env_removevar.c \
env_clearenv.c env_getenv.c env_putenv.c env_setenv.c env_unsetenv.c
WDOG_SRCS = wd_initialize.c wd_create.c wd_start.c wd_cancel.c wd_delete.c \
wd_gettime.c
TIME_SRCS = sched_processtimer.c

2
sched/env_clearenv.c
View File

@ -60,7 +60,7 @@
* Description:
* The clearenv() function clears the environment of all name-value pairs
* and sets the value of the external variable environ to NULL.
*
* Parameters:
* None
*

126
sched/env_findvar.c Normal file
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@ -0,0 +1,126 @@
/****************************************************************************
* env_findvar.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef CONFIG_DISABLE_ENVIRON
#include <string.h>
#include <sched.h>
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: env_cmpname
****************************************************************************/
static boolean env_cmpname(const char *pszname, const char *peqname)
{
/* Search until we find anything different in the two names */
for (; *pszname == *peqname; pszname++, peqname++);
/* On sucess, pszname will end with '\0' and peqname with '=' */
if ( *pszname == '\0' && *peqname == '=' )
{
return TRUE;
}
return FALSE;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: env_findvar
*
* Description:
* Search the provided environment structure for the variable of the
* specified name.
*
* Parameters:
* envp The environment structre to be searched.
* pname The variable name to find
*
* Return Value:
* A pointer to the name=value string in the environment
*
* Assumptions:
* - Not called from an interrupt handler
* - Pre-emptions is disabled by caller
*
****************************************************************************/
FAR char *env_findvar(environ_t *envp, const char *pname)
{
char *ret = NULL;
/* Verify input parameters */
if (envp && pname)
{
char *ptr;
char *end = &envp->ev_env[envp->ev_alloc];
/* Search for a name=value string with matching name */
for (ptr = envp->ev_env; ptr < end && !env_cmpname( pname, ptr); ptr += (strlen(ptr) + 1));
/* Check for success */
if (ptr < end)
{
ret = ptr;
}
}
return ret;
}
#endif /* CONFIG_DISABLE_ENVIRON */

136
sched/env_getenv.c Normal file
View File

@ -0,0 +1,136 @@
/****************************************************************************
* env_getenv.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef CONFIG_DISABLE_ENVIRON
#include <sched.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "os_internal.h"
#include "env_internal.h"
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: getenv
*
* Description:
* The getenv() function searches the environment list for a string that
* matches the string pointed to by name.
*
* Parameters:
* name - The name of the variable to find.
*
* Return Value:
* The value of the valiable (read-only) or NULL on failure
*
* Assumptions:
* Not called from an interrupt handler
*
****************************************************************************/
FAR char *getenv(const char *name)
{
FAR _TCB *rtcb;
FAR environ_t *envp;
FAR char *pvar;
FAR char *pvalue = NULL;
int ret = OK;
/* Verify that a string was passed */
if (!name)
{
ret = EINVAL;
goto errout;
}
/* Get a reference to the thread-private environ in the TCB.*/
sched_lock();
rtcb = (FAR _TCB*)g_readytorun.head;
envp = rtcb->envp;
/* Check if the variable exists */
if ( envp && (pvar = env_findvar(envp, name)) != NULL)
{
ret = ENOENT;
goto errout_with_lock;
}
/* It does! Get the value sub-string from the name=value string */
pvalue = strchr(pvar, '=');
if (!pvalue)
{
/* The name=value string has no '=' This is a bug! */
ret = EINVAL;
goto errout_with_lock;
}
/* Adjust the pointer so that it points to the value right after the '=' */
pvalue++;
sched_unlock();
return pvalue;
errout_with_lock:
sched_unlock();
errout:
*get_errno_ptr() = ret;
return NULL;
}
#endif /* CONFIG_DISABLE_ENVIRON */

7
sched/env_internal.h
View File

@ -74,9 +74,16 @@ extern "C" {
#endif
#ifndef CONFIG_DISABLE_ENVIRON
/* functions used by the task/pthread creation and destruction logic */
EXTERN int env_dup(FAR _TCB *ptcb);
EXTERN int env_share(FAR _TCB *ptcb);
EXTERN int env_release(FAR _TCB *ptcb);
/* functions used internally the environment handling logic */
EXTERN FAR char *env_findvar(environ_t *envp, const char *pname);
EXTERN int env_removevar(environ_t *envp, char *pvar);
#endif
#undef EXTERN

120
sched/env_putenv.c Normal file
View File

@ -0,0 +1,120 @@
/****************************************************************************
* env_putenv.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef CONFIG_DISABLE_ENVIRON
#include <sched.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: putenv
*
* Description:
* The putenv() function adds or changes the value of environment variables.
* The argument string is of the form name=value. If name does not already
* exist in the environment, then string is added to the environment. If
* name does exist, then the value of name in the environment is changed to
* value.
*
* Parameters:
* name=value string describing the environment setting to add/modify
*
* Return Value:
* Zero on sucess
*
* Assumptions:
* Not called from an interrupt handler
*
****************************************************************************/
int putenv(char *string)
{
char *pname;
char *pequal;
int ret = OK;
/* Verify that a string was passed */
if (!string)
{
ret = EINVAL;
goto errout;
}
/* Parse the name=value string */
pname = strdup(string);
if (!pname)
{
ret = ENOMEM;
goto errout;
}
pequal = strchr( pname, '=');
if (pequal)
{
/* Then let setenv do all of the work */
*pequal = '\0';
ret = setenv(pname, pequal+1, TRUE);
}
free(pname);
return ret;
errout:
*get_errno_ptr() = ret;
return ERROR;
}
#endif /* CONFIG_DISABLE_ENVIRON */

118
sched/env_removevar.c Normal file
View File

@ -0,0 +1,118 @@
/****************************************************************************
* env_removevar.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef CONFIG_DISABLE_ENVIRON
#include <string.h>
#include <sched.h>
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: env_removevar
*
* Description:
* Remove the referenced name=value pair from the environment
*
* Parameters:
* envp The environment containing the name=value pair
* pvar A pointer to the name=value pair in the restroom
*
* Return Value:
* Zero on success
*
* Assumptions:
* - Not called from an interrupt handler
* - Caller has pre-emptions disabled
* - Caller will reallocate the environment structure to the correct size
*
****************************************************************************/
int env_removevar(environ_t *envp, char *pvar)
{
int ret = ERROR;
if (envp && pvar)
{
/* Verify that the pointer lies within the environment region */
int alloc = envp->ev_alloc; /* Size of the allocated environment */
char *end = &envp->ev_env[alloc]; /* Pointer to the end+1 of the environment */
if (pvar >= envp->ev_env && pvar < end)
{
/* Set up for the removal */
int len = strlen(pvar) + 1; /* Length of name=value string to remove */
char *src = &pvar[len]; /* Address of name=value string after */
char *dest = pvar; /* Location to move the next string */
int count = end - src; /* Number of bytes to move (might be zero) */
/* Move all of the environment strings after the removed one 'down.'
* this is inefficient, but robably not high duty.
*/
while (count-- > 0)
{
*dest++ = *src++;
}
/* Then set to the new allocation size. The caller is expected to
* call realloc at some point but we don't do that here because the
* caller may add more stuff to the environment.
*/
envp->ev_alloc -= len;
ret = OK;
}
}
return ret;
}
#endif /* CONFIG_DISABLE_ENVIRON */

206
sched/env_setenv.c Normal file
View File

@ -0,0 +1,206 @@
/****************************************************************************
* env_setenv.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef CONFIG_DISABLE_ENVIRON
#include <stdio.h>
#include <sched.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "os_internal.h"
#include "env_internal.h"
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: setenv
*
* Description:
* The setenv() function adds the variable name to the environment with the
* specified 'value' if the varialbe 'name" does not exist. If the 'name'
* does exist in the environment, then its value is changed to 'value' if
* 'overwrite' is non-zero; if 'overwrite' is zero, then the value of name
* unaltered.
*
* Parameters:
* name - The name of the variable to change
* value - The new value of the variable
* overwrite - Replace any existing value if non-zero.
*
* Return Value:
* Zero on success
*
* Assumptions:
* Not called from an interrupt handler
*
****************************************************************************/
int setenv(const char *name, const char *value, int overwrite)
{
FAR _TCB *rtcb;
FAR environ_t *envp;
FAR char *pvar;
int varlen;
int ret = OK;
/* Verify input parameter */
if (!name)
{
ret = EINVAL;
goto errout;
}
/* if no value is provided, then this is the same as unsetenv (unless
* overwrite is false)
*/
if (!value || *value == '\0')
{
/* If overwite is set then this is the same as unsetenv */
if (overwrite)
{
return unsetenv(name);
}
else
{
/* Otherwise, it is a request to remove a variable without altering it? */
return OK;
}
}
/* Get a reference to the thread-private environ in the TCB.*/
sched_lock();
rtcb = (FAR _TCB*)g_readytorun.head;
envp = rtcb->envp;
/* Check if the variable alreay exists */
if ( envp && (pvar = env_findvar(envp, name)) != NULL)
{
/* It does! Do we have permission to overwrite the existing value? */
if (!overwrite)
{
/* No.. then just return success */
sched_unlock();
return OK;
}
/* Yes.. just remove the name=value pair from the environment. It will
* be added again below. Note that we are responsible for reallocating
* the environment buffer; this will happen below.
*/
(void)env_removevar(envp, pvar);
}
/* Get the size of the new name=value string. The +2 is for the '=' and for
* null terminator
*/
varlen = strlen(name) + strlen(value) + 2;
/* Then allocate or reallocate the environment buffer */
if (envp)
{
int alloc = envp->ev_alloc;
environ_t *tmp = (environ_t*)realloc(envp, SIZEOF_ENVIRON_T(alloc + varlen));
if (!tmp)
{
ret = ENOMEM;
goto errout_with_lock;
}
envp = tmp;
envp->ev_alloc = alloc + varlen;
pvar = &envp->ev_env[alloc];
}
else
{
envp = (environ_t*)malloc(SIZEOF_ENVIRON_T(varlen));
if (!envp)
{
ret = ENOMEM;
goto errout_with_lock;
}
envp->ev_crefs = 1;
envp->ev_alloc = varlen;
pvar = envp->ev_env;
}
/* Now, put the new name=value string into the environment buffer */
sprintf(pvar, "%s=%s", name, value);
/* Save the new environment pointer (it might have changed due to allocation or
* reallocation.
*/
rtcb->envp = envp;
sched_unlock();
return OK;
errout_with_lock:
sched_unlock();
errout:
*get_errno_ptr() = ret;
return ERROR;
}
#endif /* CONFIG_DISABLE_ENVIRON */

137
sched/env_unsetenv.c Normal file
View File

@ -0,0 +1,137 @@
/****************************************************************************
* env_unsetenv.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifndef CONFIG_DISABLE_ENVIRON
#include <sched.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include "os_internal.h"
#include "env_internal.h"
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: unsetenv
*
* Description:
* The unsetenv() function deletes the variable name from the environment.
*
* Parameters:
* name - The name of the variable to delete
*
* Return Value:
* Zero on success
*
* Assumptions:
* Not called from an interrupt handler
*
****************************************************************************/
int unsetenv(const char *name)
{
FAR _TCB *rtcb;
FAR environ_t *envp;
FAR char *pvar;
int ret = OK;
/* Verify input parameter */
if (!name)
{
ret = EINVAL;
goto errout;
}
/* Get a reference to the thread-private environ in the TCB.*/
sched_lock();
rtcb = (FAR _TCB*)g_readytorun.head;
envp = rtcb->envp;
/* Check if the variable exists */
if ( envp && (pvar = env_findvar(envp, name)) != NULL)
{
int alloc;
environ_t *tmp;
/* It does! Remove the name=value pair from the environment. */
(void)env_removevar(envp, pvar);
/* Reallocate the new environment buffer */
alloc = envp->ev_alloc;
tmp = (environ_t*)realloc(envp, SIZEOF_ENVIRON_T(alloc));
if (!tmp)
{
ret = ENOMEM;
goto errout_with_lock;
}
/* Save the new environment pointer (it might have changed due to reallocation. */
rtcb->envp = tmp;
}
sched_unlock();
return OK;
errout_with_lock:
sched_unlock();
errout:
*get_errno_ptr() = ret;
return ERROR;
}
#endif /* CONFIG_DISABLE_ENVIRON */