147 lines
4.9 KiB
C
147 lines
4.9 KiB
C
/*
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* Copyright 1998-2002 by Albert Cahalan; all rights resered.
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* This file may be used subject to the terms and conditions of the
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* GNU Library General Public License Version 2, or any later version
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* at your option, as published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "common.h"
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#include "../proc/readproc.h"
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#include "../proc/procps.h"
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//#define process_group_leader(p) ((p)->pgid == (p)->tgid)
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//#define some_other_user(p) ((p)->euid != cached_euid)
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#define has_our_euid(p) ((unsigned)(p)->euid == (unsigned)cached_euid)
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#define on_our_tty(p) ((unsigned)(p)->tty == (unsigned)cached_tty)
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#define running(p) (((p)->state=='R')||((p)->state=='D'))
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#define session_leader(p) ((p)->session == (p)->tgid)
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#define without_a_tty(p) (!(p)->tty)
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static unsigned long select_bits = 0;
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/***** prepare select_bits for use */
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const char *select_bits_setup(void){
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int switch_val = 0;
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/* don't want a 'g' screwing up simple_select */
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if(!simple_select && !prefer_bsd_defaults){
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select_bits = 0xaa00; /* the STANDARD selection */
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return NULL;
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}
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/* For every BSD but SunOS, the 'g' option is a NOP. (enabled by default) */
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if( !(personality & PER_NO_DEFAULT_g) && !(simple_select&(SS_U_a|SS_U_d)) )
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switch_val = simple_select|SS_B_g;
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else
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switch_val = simple_select;
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switch(switch_val){
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/* UNIX options */
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case SS_U_a | SS_U_d: select_bits = 0x3f3f; break; /* 3333 or 3f3f */
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case SS_U_a: select_bits = 0x0303; break; /* 0303 or 0f0f */
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case SS_U_d: select_bits = 0x3333; break;
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/* SunOS 4 only (others have 'g' enabled all the time) */
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case 0: select_bits = 0x0202; break;
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case SS_B_a: select_bits = 0x0303; break;
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case SS_B_x : select_bits = 0x2222; break;
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case SS_B_x | SS_B_a: select_bits = 0x3333; break;
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/* General BSD options */
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case SS_B_g : select_bits = 0x0a0a; break;
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case SS_B_g | SS_B_a: select_bits = 0x0f0f; break;
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case SS_B_g | SS_B_x : select_bits = 0xaaaa; break;
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case SS_B_g | SS_B_x | SS_B_a: /* convert to -e instead of using 0xffff */
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all_processes = 1;
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simple_select = 0;
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break;
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default:
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return _("Process selection options conflict.");
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break;
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}
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return NULL;
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}
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/***** selected by simple option? */
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static int table_accept(proc_t *buf){
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unsigned proc_index;
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proc_index = (has_our_euid(buf) <<0)
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| (session_leader(buf) <<1)
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| (without_a_tty(buf) <<2)
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| (on_our_tty(buf) <<3);
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return (select_bits & (1<<proc_index));
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}
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/***** selected by some kind of list? */
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static int proc_was_listed(proc_t *buf){
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selection_node *sn = selection_list;
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int i;
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if(!sn) return 0;
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while(sn){
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switch(sn->typecode){
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default:
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printf(_("Internal error in ps! Please report this bug.\n"));
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#define return_if_match(foo,bar) \
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i=sn->n; while(i--) \
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if((unsigned)(buf->foo) == (unsigned)(*(sn->u+i)).bar) \
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return 1
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break; case SEL_RUID: return_if_match(ruid,uid);
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break; case SEL_EUID: return_if_match(euid,uid);
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break; case SEL_SUID: return_if_match(suid,uid);
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break; case SEL_FUID: return_if_match(fuid,uid);
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break; case SEL_RGID: return_if_match(rgid,gid);
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break; case SEL_EGID: return_if_match(egid,gid);
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break; case SEL_SGID: return_if_match(sgid,gid);
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break; case SEL_FGID: return_if_match(fgid,gid);
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break; case SEL_PGRP: return_if_match(pgrp,pid);
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break; case SEL_PID : return_if_match(tgid,pid);
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break; case SEL_PPID: return_if_match(ppid,ppid);
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break; case SEL_TTY : return_if_match(tty,tty);
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break; case SEL_SESS: return_if_match(session,pid);
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break; case SEL_COMM: i=sn->n; while(i--)
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if(!strncmp( buf->cmd, (*(sn->u+i)).cmd, 15 )) return 1;
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#undef return_if_match
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}
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sn = sn->next;
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}
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return 0;
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}
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/***** This must satisfy Unix98 and as much BSD as possible */
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int want_this_proc(proc_t *buf){
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int accepted_proc = 1; /* assume success */
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/* elsewhere, convert T to list, U sets x implicitly */
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/* handle -e -A */
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if(all_processes) goto finish;
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/* use table for -a a d g x */
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if((simple_select || !selection_list))
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if(table_accept(buf)) goto finish;
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/* search lists */
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if(proc_was_listed(buf)) goto finish;
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/* fail, fall through to loose ends */
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accepted_proc = 0;
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/* do r N */
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finish:
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if(running_only && !running(buf)) accepted_proc = 0;
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if(negate_selection) return !accepted_proc;
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return accepted_proc;
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}
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