Example of using spawnlp in a QNX program to call out to cp in order to copy a file.

spawnlp_test.c

#include <stdlib.h>
#include <stdio.h>
#include <process.h>


int main(int argc, char *argv[]) {
    if (argc >= 3) {

	    // call out to cp and use the arguments passed to this program.
	    // We are using P_WAIT so that spawnlp waits for CP to return
	    // The second argument specifies the executable to run
	    // The third-fifth argument will become argv[0] - argv[2] of the executable
	    // The sixth argument indicates that the list of arguments is done
	    //
	    // For more information see http://www.qnx.com/developers/docs/6.3.0SP3/neutrino/lib_ref/s/spawnlp.html
	    int retValue = spawnlp(P_WAIT,  "cp",  "cp", argv[1], argv[2], NULL);

	    printf("Return value of calling `cp %s %s` is %d\n", argv[1], argv[2], retValue);
	} else {
	    printf("Please specify two files to copy\n");
	}
	
	return EXIT_SUCCESS;
}

Somehow I created this as an anonymous gist.