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The latest version of this topic can be found at _spawnlp, _wspawnlp.
Creates and executes a new process.
This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.
intptr_t _spawnlp( int mode, const char *cmdname, const char *arg0, const char *arg1, ... const char *argn, NULL ); intptr_t _wspawnlp( int mode, const wchar_t *cmdname, const wchar_t *arg0, const wchar_t *arg1, ... const wchar_t *argn, NULL );
Execution mode for the calling process.
Path of the file to be executed.
arg0, arg1, ... argn
List of pointers to arguments. The
arg0 argument is usually a pointer to
cmdname. The arguments
argn are pointers to the character strings forming the new argument list. Following
argn, there must be a
NULL pointer to mark the end of the argument list.
The return value from a synchronous
_P_WAIT specified for
mode) is the exit status of the new process. The return value from an asynchronous
_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.
Argument list exceeds 1024 bytes.
mode argument is invalid.
File or path is not found.
Specified file is not executable or has invalid executable-file format.
Not enough memory is available to execute the new process.
For more information about these and other return codes, see _doserrno, errno, _sys_errlist, and _sys_nerr.
Each of these functions creates 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.
These functions validate their parameters. If either
arg0 is an empty string or a null pointer, these functions generate an invalid parameter exception, as described in Parameter Validation. If execution is allowed to continue, these functions set
EINVAL, and return -1. No new process is spawned.
||<stdio.h> or <wchar.h>|
For more compatibility information, see Compatibility.
See the example in _spawn, _wspawn Functions.