2.9BSD/usr/src/lib/libU77/fork_.c

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/*
char id_fork[] = "@(#)fork_.c	1.1";
 *
 * fork a copy of this process
 *
 * calling sequence:
 *	integer fork
 *	ierror = fork()
 * where:
 *	ierror will be	- child pid if parent and successful
 *			- 0 if child
 *			- -errno if unsuccessful
 */

#include	"../libI77/fiodefs.h"

extern int errno;

ftnint fork_()
{
	ftnint i;

	for (i = 0; i < MXUNIT; i++)
		flush_(&i);
	i = (ftnint)fork();
	if (i < 0)
		return((ftnint)(-errno));
	return(i);
}