_execvpe, _wexecvpe

Article
06/05/2017

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The latest version of this topic can be found at _execvpe, _wexecvpe.

Loads and runs new child processes.

Important

This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

Syntax

intptr_t _execvpe(   
   const char *cmdname,  
   const char *const *argv,  
   const char *const *envp   
);  
intptr_t _wexecvpe(   
   const wchar_t *cmdname,  
   const wchar_t *const *argv,  
   const wchar_t *const *envp   
);

Parameters

cmdname
Path of the file to execute.

argv
Array of pointers to parameters.

envp
Array of pointers to environment settings.

Return Value

If successful, these functions do not return to the calling process. A return value of –1 indicates an error, in which case the errno global variable is set.

`errno` value	Description
`E2BIG`	The space that's required for the arguments and environment settings exceeds 32 KB.
`EACCES`	The specified file has a locking or sharing violation.
`EMFILE`	Too many files are open. (The specified file must be opened to determine whether it is executable.)
`ENOENT`	The file or path is not found.
`ENOEXEC`	The specified file is not executable or has an invalid executable-file format.
`ENOMEM`	Not enough memory is available to execute the new process; the available memory has been corrupted; or an invalid block exists, which indicates that the calling process was not allocated correctly.

For more information about these and other return codes, see errno, _doserrno, _sys_errlist, and _sys_nerr.

Remarks

Each of these functions loads and executes a new process, and passes an array of pointers to command-line arguments and an array of pointers to environment settings. These functions use the PATH environment variable to find the file to execute.

The _execvpe functions validate their parameters. If the cmdname is a null pointer, or if argv is a null pointer, a pointer to an empty array, or a pointer to an array that contains an empty string as the first argument, these functions invoke the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, these functions set errno to EINVAL and return -1. No process is launched.

Requirements

Function	Required header	Optional header
`_execvpe`	<process.h>	<errno.h>
`_wexecvpe`	<process.h> or <wchar.h>	<errno.h>

For more compatibility information, see Compatibility.

Example

See the example in _exec, _wexec Functions.

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