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_spawnvp, _wspawnvp 

Create and execute a new process.


intptr_t _spawnvp(
   int mode,
   const char *cmdname,
   const char *const *argv 
);
intptr_t _wspawnvp(
   int mode,
   const wchar_t *cmdname,
   const wchar_t *const *argv 
);

Parameters

mode

Execution mode for calling process

cmdname

Path of file to be executed

argv

Array of pointers to arguments

The return value from a synchronous _spawnvp or _wspawnvp (_P_WAIT specified for mode) is the exit status of the new process. The return value from an asynchronous _spawnvp or _wspawnvp (_P_NOWAIT or _P_NOWAITO specified for mode) is the process handle. The exit status is 0 if the process terminated normally. You can set the exit status to a nonzero value if the spawned process specifically calls the exit routine with a nonzero argument. If the new process did not explicitly set a positive exit status, a positive exit status indicates an abnormal exit with an abort or an interrupt. A return value of –1 indicates an error (the new process is not started). In this case, errno is set to one of the following values:

E2BIG

Argument list exceeds 1024 bytes

EINVAL

mode argument is invalid

ENOENT

File or path is not found

ENOEXEC

Specified file is not executable or has invalid executable-file format

ENOMEM

Not enough memory is available to execute new process

See _doserrno, errno, _sys_errlist, and _sys_nerr for more information on these, and other, return codes.

Each of these functions creates and executes a new process, passing an array of pointers to command-line arguments and using the PATH environment variable to find the file to execute.

These functions validate their parameters. If either cmdname or argv is a null pointer, or if argv points to null pointer, or argv[0] is an empty string, the invalid parameter handler is invoked, as described in Parameter Validation . If execution is allowed to continue, these functions set errno to EINVAL, and return -1. No new process is spawned.

Routine Required header Compatibility

_spawnvp

<stdio.h> or <process.h>

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

_wspawnvp

<stdio.h> or <wchar.h>

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

For additional compatibility information, see Compatibility in the Introduction.

See the example in _spawn, _wspawn Functions.

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