_execlp, _wexeclp
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_execlp, _wexeclp 

Loads and executes new child processes.

intptr_t _execlp( 
   const char *cmdname,
   const char *arg0,
   ... const char *argn,
intptr_t _wexeclp( 
   const wchar_t *cmdname,
   const wchar_t *arg0,
   ... const wchar_t *argn,



Path of the file to execute.

arg0, ... argn

List of pointers to parameters.

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


The space required for the arguments and environment settings exceeds 32 KB.


The specified file has a locking or sharing violation.


Invalid parameter.


Too many files open (the specified file must be opened to determine whether it is executable).


The file or path not found.


The specified file is not executable or has an invalid executable-file format.


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.

Each of these functions loads and executes a new process, passing each command-line argument as a separate parameter and using the PATH environment variable to find the file to execute.

In Visual C++ 2005, the _execlp functions validate their parameters. If cmdname or arg0 is a null pointer or empty string, 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 new process is launched.

Function Required header Optional header Compatibility




Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003


<process.h> or <wchar.h>


Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For more compatibility information, see Compatibility in the Introduction.

See the example in _exec, _wexec Functions.

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