[exim.git] / src / OS / os.c-Linux-libc5

/* $Cambridge: exim/src/OS/os.c-Linux-libc5,v 1.1 2004/10/06 15:07:39 ph10 Exp $ */

/*************************************************
*     Exim - an Internet mail transport agent    *
*************************************************/

/* Copyright (c) University of Cambridge 2001 */
/* See the file NOTICE for conditions of use and distribution. */

/* Linux-specific code. This is concatenated onto the generic src/os.c file.
Linux has an apparently unique way of getting the load average, so we provide a
unique function here, and define OS_LOAD_AVERAGE to stop src/os.c trying to
provide the function. The macro may be set initially anyway, when compiling os.
for utilities that don't want this function. */

#ifndef OS_LOAD_AVERAGE
#define OS_LOAD_AVERAGE

int
os_getloadavg(void)
{
char buffer[40];
double avg;
int count;
int fd = open ("/proc/loadavg", O_RDONLY);
if (fd == -1) return -1;
count = read (fd, buffer, sizeof(buffer));
(void)close (fd);
if (count <= 0) return -1;
count = sscanf (buffer, "%lf", &avg);
if (count < 1) return -1;

return (int)(avg * 1000.0);
}

#endif  /* OS_LOAD_AVERAGE */

/* End of os.c-Linux */
Commit	Line	Data
61ec970d PH	1	/* $Cambridge: exim/src/OS/os.c-Linux-libc5,v 1.1 2004/10/06 15:07:39 ph10 Exp $ */
	2
	3	/*************************************************
	4	* Exim - an Internet mail transport agent *
	5	*************************************************/
	6
	7	/* Copyright (c) University of Cambridge 2001 */
	8	/* See the file NOTICE for conditions of use and distribution. */
	9
	10	/* Linux-specific code. This is concatenated onto the generic src/os.c file.
	11	Linux has an apparently unique way of getting the load average, so we provide a
	12	unique function here, and define OS_LOAD_AVERAGE to stop src/os.c trying to
	13	provide the function. The macro may be set initially anyway, when compiling os.
	14	for utilities that don't want this function. */
	15
	16	#ifndef OS_LOAD_AVERAGE
	17	#define OS_LOAD_AVERAGE
	18
	19	int
	20	os_getloadavg(void)
	21	{
	22	char buffer[40];
	23	double avg;
	24	int count;
	25	int fd = open ("/proc/loadavg", O_RDONLY);
	26	if (fd == -1) return -1;
	27	count = read (fd, buffer, sizeof(buffer));
	28	(void)close (fd);
	29	if (count <= 0) return -1;
	30	count = sscanf (buffer, "%lf", &avg);
	31	if (count < 1) return -1;
	32
	33	return (int)(avg * 1000.0);
	34	}
	35
	36	#endif /* OS_LOAD_AVERAGE */
	37
	38	/* End of os.c-Linux */
	39