/*****************************************************************************\
 *  slurm_rlimits_info.c - resource limits that are used by srun and the slurmd
 *****************************************************************************
 *  Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
 *
 *  This file is part of Slurm, a resource management program.
 *  For details, see <https://slurm.schedmd.com/>.
 *  Please also read the included file: DISCLAIMER.
 *
 *  Slurm is free software; you can redistribute it and/or modify it under
 *  the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  In addition, as a special exception, the copyright holders give permission
 *  to link the code of portions of this program with the OpenSSL library under
 *  certain conditions as described in each individual source file, and
 *  distribute linked combinations including the two. You must obey the GNU
 *  General Public License in all respects for all of the code used other than
 *  OpenSSL. If you modify file(s) with this exception, you may extend this
 *  exception to your version of the file(s), but you are not obligated to do
 *  so. If you do not wish to do so, delete this exception statement from your
 *  version.  If you delete this exception statement from all source files in
 *  the program, then also delete it here.
 *
 *  Slurm 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 General Public License for more
 *  details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with Slurm; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
\*****************************************************************************/

#include <stdio.h>
#include <string.h>
#include <sys/param.h>	/* for OPEN_MAX on macOS */
#include <sys/time.h>
#include <sys/resource.h>

#include "src/common/macros.h"
#include "src/common/xstring.h"
#include "src/common/xassert.h"
#include "src/common/xmalloc.h"
#include "src/common/log.h"
#include "src/common/slurm_rlimits_info.h"


/*
 * List Slurm rlimits get/setrlimit resource number with associated name and
 * whether it should be propagated.
 */

static slurm_rlimits_info_t rlimits_info[] = {

		/*  resource,        name,       propagate_flag  */

#ifdef RLIMIT_CPU
		{ RLIMIT_CPU,      "CPU",      PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_FSIZE
		{ RLIMIT_FSIZE,    "FSIZE",    PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_DATA
		{ RLIMIT_DATA,     "DATA",     PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_STACK
		{ RLIMIT_STACK,    "STACK",    PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_CORE
		{ RLIMIT_CORE,     "CORE",     PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_RSS
		{ RLIMIT_RSS,      "RSS",      PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_NPROC
		{ RLIMIT_NPROC,    "NPROC",    PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_NOFILE
		{ RLIMIT_NOFILE,   "NOFILE",   PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_MEMLOCK
		{ RLIMIT_MEMLOCK,  "MEMLOCK",  PROPAGATE_RLIMITS_NOT_SET },
#endif
#ifdef RLIMIT_AS
		{ RLIMIT_AS,       "AS",       PROPAGATE_RLIMITS_NOT_SET },
#endif
		{ 0,               NULL,       PROPAGATE_RLIMITS_NOT_SET }
};


static bool rlimits_were_parsed = false;

/*
 * Return a pointer to the private rlimits info array.
 */
slurm_rlimits_info_t *
get_slurm_rlimits_info( void )
{
	xassert( rlimits_were_parsed == true );

	return rlimits_info;
}


#define RLIMIT_         "RLIMIT_"
#define LEN_RLIMIT_     (sizeof( RLIMIT_ ) - 1)
#define RLIMIT_DELIMS   ", \t\n"

/*
 * Parse a comma separated list of RLIMIT names.
 *
 * Return 0 on success, or -1 if the 'rlimits_str' input parameter contains
 * a name that is not in rlimits_info[].
 */
int
parse_rlimits( char *rlimits_str, int propagate_flag )
{
	slurm_rlimits_info_t *rli;	/* ptr iterator for rlimits_info[] */
	char		     *tp;	/* token ptr */
	bool		     found;
	bool		     propagate_none = false;
	char		     *rlimits_str_dup;

	xassert( rlimits_str );

	if (xstrcmp(rlimits_str, "NONE") == 0) {
		propagate_none = true;
		propagate_flag = !propagate_flag;
	}

	if (propagate_none || xstrcmp( rlimits_str, "ALL" ) == 0) {
		/*
		 * Propagate flag value applies to all rlimits
		 */
		for (rli = rlimits_info; rli->name; rli++)
			rli->propagate_flag = propagate_flag;
		rlimits_were_parsed = true;
		return( 0 );
	}

	/*
	 * Since parse_rlimits may be called multiple times, we
	 * need to reinitialize the propagate flags when individual
	 * rlimits are specified.
	 */
	if (rlimits_were_parsed)
		for (rli = rlimits_info; rli->name; rli++)
			rli->propagate_flag = PROPAGATE_RLIMITS_NOT_SET;

	rlimits_str_dup = xstrdup( rlimits_str );
	tp = strtok( rlimits_str_dup, RLIMIT_DELIMS );
	while (tp != NULL) {
		found = false;
		for (rli = rlimits_info; rli->name; rli++) {
			/*
			 * Accept either "RLIMIT_CORE" or "CORE"
			 */
			if (xstrncmp( tp, RLIMIT_, LEN_RLIMIT_ ) == 0)
				tp += LEN_RLIMIT_;
			if (xstrcmp( tp, rli->name ))
				continue;
			rli->propagate_flag = propagate_flag;
			found = true;
			break;
		}
		if (found == false) {
			error( "Bad rlimit name: %s", tp );
			xfree( rlimits_str_dup );
			return( -1 );
		}
		tp = strtok( NULL, RLIMIT_DELIMS );
	}
	xfree( rlimits_str_dup );

	/*
	 * Any rlimits that weren't in the 'rlimits_str' parameter get the
	 * opposite propagate flag value.
	 */
	for (rli = rlimits_info; rli->name; rli++)
		if (rli->propagate_flag == PROPAGATE_RLIMITS_NOT_SET)
			rli->propagate_flag = ( ! propagate_flag );

	rlimits_were_parsed = true;
	return( 0 );
}

extern void print_rlimits(void)
{
	slurm_rlimits_info_t *rli;	/* ptr iterator for rlimits_info[] */
	struct rlimit rlp;

	for (rli = rlimits_info; rli->name; rli++) {
		if (getrlimit(rli->resource, &rlp) == 0) {
			printf("SLURM_RLIMIT_%s=%lu\n", rli->name,
			       (unsigned long) rlp.rlim_cur);
		}
	}
}

extern void rlimits_use_max_nofile(void)
{
	struct rlimit rlim;

	if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
		error("getrlimit(RLIMIT_NOFILE): %m");
		return;
	}

	rlim.rlim_cur = rlim.rlim_max;

	if (setrlimit(RLIMIT_NOFILE, &rlim) < 0)
		error("Unable to adjust maximum number of open files: %m");
}