_execv, _wexecv

Статья
10/16/2008

Loads and executes new child processes.

intptr_t _execv( 
   const char *cmdname,
   const char *const *argv 
);
intptr_t _wexecv( 
   const wchar_t *cmdname,
   const wchar_t *const *argv 
);

Параметры

cmdname
Path of the file to execute.
argv
Array of pointers to parameters.

Возвращаемое значение

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 required for the arguments and environment settings exceeds 32 KB.
EACCES	The specified file has a locking or sharing violation.
EINVAL	Invalid parameter.
EMFILE	Too many files open (the specified file must be opened to determine whether it is executable).
ENOENT	The file or path 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, indicating that the calling process was not allocated properly.

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

Заметки

Each of these functions loads and executes a new process, passing an array of pointers to command-line arguments.

In Visual C++ 2005, the _execv functions validate their parameters. If cmdname is a null pointer, or if argv is a null pointer, pointer to an empty array, or if the array contains an empty string as the first argument, the _execv 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.