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Filename : plimit.stp
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# plimit.stp
# Copyright (C) 2006 Red Hat, Inc., Eugene Teo <eteo@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#

# Example:
# $ stap -g plimit.stp `pgrep udevd`
# OR
# $ stap -g plimit.stp -x `pgrep udevd`

#
# plimit.stp  prints a variety of resource limits for a given pid.
#

%{ 
   #include <linux/sched.h>
   #include <linux/list.h>
%}

function getrlimit:string (rlim:long, pid:long) %{ /* pure */
	struct task_struct *p;
	struct list_head *_p, *_n;
	static char cur_buf[24], max_buf[24];
	long int cur, max;

	list_for_each_safe(_p, _n, &current->tasks) {
		p = list_entry(_p, struct task_struct, tasks);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,12)
		cur = p->signal->rlim[STAP_ARG_rlim].rlim_cur;
		max = p->signal->rlim[STAP_ARG_rlim].rlim_max;
#else
		cur = p->rlim[STAP_ARG_rlim].rlim_cur;
		max = p->rlim[STAP_ARG_rlim].rlim_max;
#endif
		if (p->pid == (int)STAP_ARG_pid) {
			if (cur == -1 && max == -1)
				strcat(STAP_RETVALUE, "unlimited  unlimited");
			else if (cur == -1)
				snprintf(STAP_RETVALUE, MAXSTRINGLEN, "%-9s  %-9ld",
					"unlimited", max);
			else if (max == -1)
				snprintf(STAP_RETVALUE, MAXSTRINGLEN, "%-9ld  %-9s",
					cur, "unlimited");
			else
				snprintf(STAP_RETVALUE, MAXSTRINGLEN, "%-9ld  %-9ld",
					cur, max);
		}
	}
%}

function task_execname_by_pid:string (pid:long) %{ /* pure */
	struct task_struct *p;
	struct list_head *_p, *_n;
	list_for_each_safe(_p, _n, &current->tasks) {
		p = list_entry(_p, struct task_struct, tasks);
		if (p->pid == (int)STAP_ARG_pid) 
			snprintf(STAP_RETVALUE, MAXSTRINGLEN, "%s", p->comm);
	}
%}

probe begin {
%( $# < 1
        %? pid = target()
        %: pid = $1
%)
   
   if (pid == 0) error ("Please provide valid target process-id as $1 or -x PID");
   
	printf("%d:  -%s\n", pid, task_execname_by_pid(pid))
	/* include/asm-generic/resource.h */
   	printf(" resource                    current    maximum\n")
	printf("coredump(blocks)            %s\n", getrlimit(4,  pid))
	printf("data(bytes)                 %s\n", getrlimit(2,  pid))
	printf("max nice                    %s\n", getrlimit(13, pid))
	printf("file size(blocks)           %s\n", getrlimit(1,  pid))
	printf("pending signals             %s\n", getrlimit(11, pid))
	printf("max locked memory(bytes)    %s\n", getrlimit(8,  pid))
	printf("max memory size(bytes)      %s\n", getrlimit(5,  pid))
	printf("open files                  %s\n", getrlimit(7,  pid))
	printf("POSIX message queues(bytes) %s\n", getrlimit(12, pid))
	printf("max rt priority             %s\n", getrlimit(14, pid))
	printf("stack size(bytes)           %s\n", getrlimit(3,  pid))
	printf("cpu time(seconds)           %s\n", getrlimit(0,  pid))
	printf("max user processes          %s\n", getrlimit(6,  pid))
	printf("virtual memory(bytes)       %s\n", getrlimit(9,  pid))
	printf("file locks                  %s\n", getrlimit(10, pid))

	exit()
}