glibc/sysdeps/unix/sysv/linux/getloadavg.c
Ulrich Drepper 4aebaa6bd9 Update.
* argp/argp-help.c: Unify use of function aliases to make more compact
	PLT.
	* include/libintl.h: Likewise.
	* inet/rcmd.c: Likewise.
	* intl/dcigettext.c: Likewise.
	* libio/iofputws.c: Likewise.
	* libio/iofputws_u.c: Likewise.
	* libio/iogetwline.c: Likewise.
	* libio/swprintf.c: Likewise.
	* malloc/malloc.c: Likewise.
	* nss/digits_dots.c: Likewise.
	* posix/fnmatch.c: Likewise.
	* posix/spawn_faction_addclose.c: Likewise.
	* posix/spawn_faction_adddup2.c: Likewise.
	* posix/spawn_faction_addopen.c: Likewise.
	* posix/spawni.c: Likewise.
	* posix/wordexp.c: Likewise.
	* posix/spawni.c: Likewise.
	* resolv/res_hconf.c: Likewise.
	* resolv/res_init.c: Likewise.
	* shadow/lckpwdf.c: Likewise.
	* signal/sighold.c: Likewise.
	* signal/sigrelse.c: Likewise.
	* stdio-common/printf-parse.h: Likewise.
	* stdio-common/printf-prs.c: Likewise.
	* stdio-common/printf_fp.c: Likewise.
	* stdio-common/vfprintf.c: Likewise.
	* stdio-common/vfscanf.c: Likewise.
	* stdlib/rpmatch.c: Likewise.
	* sunrpc/create_xid.c: Likewise.
	* sunrpc/key_call.c: Likewise.
	* sysdeps/generic/setrlimit64.c: Likewise.
	* sysdeps/generic/utmp_file.c: Likewise.
	* sysdeps/generic/vlimit.c: Likewise.
	* sysdeps/posix/posix_fallocate.c: Likewise.
	* sysdeps/posix/posix_fallocate64.c: Likewise.
	* sysdeps/posix/sigpause.c: Likewise.
	* sysdeps/posix/sigset.c: Likewise.
	* sysdeps/unix/grantpt.c: Likewise.
	* sysdeps/unix/bsd/ualarm.c: Likewise.
	* sysdeps/unix/sysv/linux/dl-origin.c: Likewise.
	* sysdeps/unix/sysv/linux/getloadavg.c: Likewise.
	* sysdeps/unix/sysv/linux/ttyname.c: Likewise.
	* sysdeps/unix/sysv/linux/ulimit.c: Likewise.
	* time/strftime.c: Likewise.
	* wcsmbs/wcscoll.c: Likewise.
	* wcsmbs/wcsxfrm.c: Likewise.

	* sysdeps/powerpc/fpu_control.h (_FPU_GETCW): Allow gcc to generate
	postinc/predec instruction.
2000-08-21 04:18:25 +00:00

65 lines
1.8 KiB
C

/* Get system load averages. Linux (/proc/loadavg) version.
Copyright (C) 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
/* Put the 1 minute, 5 minute and 15 minute load averages
into the first NELEM elements of LOADAVG.
Return the number written (never more than 3, but may be less than NELEM),
or -1 if an error occurred. */
int
getloadavg (double loadavg[], int nelem)
{
int fd;
fd = __open ("/proc/loadavg", O_RDONLY);
if (fd < 0)
return -1;
else
{
char buf[65], *p;
ssize_t nread;
int i;
nread = __read (fd, buf, sizeof buf - 1);
__close (fd);
if (nread < 0)
return -1;
buf[nread - 1] = '\0';
if (nelem > 3)
nelem = 3;
p = buf;
for (i = 0; i < nelem; ++i)
{
char *endp;
loadavg[i] = strtod (p, &endp);
if (!endp || endp == p)
break;
p = endp;
}
return i;
}
}