[unix-history] / usr / src / usr.bin / tip / lock.c

/*	lock.c	4.3	81/11/29	*/
#include "tip.h"

#ifdef ACULOG
/*
 * Locking mechanism for files
 */

static int fd = -1;

lock(f)
	char *f;
{
	int timeout = 0;

	while ((fd = creat(f, 0444)) < 0) {
		if (++timeout == 6)
			break;
		sleep(5);
	}
	if (timeout == 6 && fd >= 0)
		unlock(); 
	else
		unlink(f);
	return (fd >= 0);
}

unlock()
{
	if (fd != -1)
		close(fd);
	fd = -1;
}
#endif
Commit	Line	Data
a0c21c7b C	1	/* lock.c 4.3 81/11/29 */
	2	#include "tip.h"
	3
	4	#ifdef ACULOG
	5	/*
	6	* Locking mechanism for files
	7	*/
	8
	9	static int fd = -1;
	10
	11	lock(f)
	12	char *f;
	13	{
	14	int timeout = 0;
	15
	16	while ((fd = creat(f, 0444)) < 0) {
	17	if (++timeout == 6)
	18	break;
	19	sleep(5);
	20	}
	21	if (timeout == 6 && fd >= 0)
	22	unlock();
	23	else
	24	unlink(f);
	25	return (fd >= 0);
	26	}
	27
	28	unlock()
	29	{
	30	if (fd != -1)
	31	close(fd);
	32	fd = -1;
	33	}
	34	#endif