xref: /freebsd/sys/fs/procfs/procfs_status.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*-
2  * Copyright (c) 1993 Jan-Simon Pendry
3  * Copyright (c) 1993
4  *	The Regents of the University of California.  All rights reserved.
5  *
6  * This code is derived from software contributed to Berkeley by
7  * Jan-Simon Pendry.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  *	@(#)procfs_status.c	8.4 (Berkeley) 6/15/94
34  *
35  * From:
36  *	$Id: procfs_status.c,v 3.1 1993/12/15 09:40:17 jsp Exp $
37  * $FreeBSD$
38  */
39 
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/systm.h>
43 #include <sys/exec.h>
44 #include <sys/lock.h>
45 #include <sys/mutex.h>
46 #include <sys/jail.h>
47 #include <sys/malloc.h>
48 #include <sys/mutex.h>
49 #include <sys/sx.h>
50 #include <sys/proc.h>
51 #include <sys/resourcevar.h>
52 #include <sys/sbuf.h>
53 #include <sys/sysent.h>
54 #include <sys/tty.h>
55 
56 #include <vm/vm.h>
57 #include <vm/pmap.h>
58 #include <vm/vm_param.h>
59 
60 #include <fs/pseudofs/pseudofs.h>
61 #include <fs/procfs/procfs.h>
62 
63 int
64 procfs_doprocstatus(PFS_FILL_ARGS)
65 {
66 	struct session *sess;
67 	struct thread *tdfirst;
68 	struct tty *tp;
69 	struct ucred *cr;
70 	const char *wmesg;
71 	char *pc;
72 	char *sep;
73 	int pid, ppid, pgid, sid;
74 	int i;
75 
76 	pid = p->p_pid;
77 	PROC_LOCK(p);
78 	ppid = p->p_pptr ? p->p_pptr->p_pid : 0;
79 	pgid = p->p_pgrp->pg_id;
80 	sess = p->p_pgrp->pg_session;
81 	SESS_LOCK(sess);
82 	sid = sess->s_leader ? sess->s_leader->p_pid : 0;
83 
84 /* comm pid ppid pgid sid tty ctty,sldr start ut st wmsg
85 				euid ruid rgid,egid,groups[1 .. NGROUPS]
86 */
87 
88 	pc = p->p_comm;
89 	do {
90 		if (*pc < 33 || *pc > 126 || *pc == '\\')
91 			sbuf_printf(sb, "\\%03o", *pc);
92 		else
93 			sbuf_putc(sb, *pc);
94 	} while (*++pc);
95 	sbuf_printf(sb, " %d %d %d %d ", pid, ppid, pgid, sid);
96 	if ((p->p_flag & P_CONTROLT) && (tp = sess->s_ttyp))
97 		sbuf_printf(sb, "%s ", devtoname(tp->t_dev));
98 	else
99 		sbuf_printf(sb, "- ");
100 
101 	sep = "";
102 	if (sess->s_ttyvp) {
103 		sbuf_printf(sb, "%sctty", sep);
104 		sep = ",";
105 	}
106 	if (SESS_LEADER(p)) {
107 		sbuf_printf(sb, "%ssldr", sep);
108 		sep = ",";
109 	}
110 	SESS_UNLOCK(sess);
111 	if (*sep != ',') {
112 		sbuf_printf(sb, "noflags");
113 	}
114 
115 #ifdef KSE
116 	if (p->p_flag & P_SA)
117 		wmesg = "-kse- ";
118 	else
119 #endif
120 	{
121 		tdfirst = FIRST_THREAD_IN_PROC(p);
122 		if (tdfirst->td_wchan != NULL) {
123 			KASSERT(tdfirst->td_wmesg != NULL,
124 			    ("wchan %p has no wmesg", tdfirst->td_wchan));
125 			wmesg = tdfirst->td_wmesg;
126 		} else
127 			wmesg = "nochan";
128 	}
129 
130 	if (p->p_flag & P_INMEM) {
131 		struct timeval start, ut, st;
132 
133 		PROC_SLOCK(p);
134 		calcru(p, &ut, &st);
135 		PROC_SUNLOCK(p);
136 		start = p->p_stats->p_start;
137 		timevaladd(&start, &boottime);
138 		sbuf_printf(sb, " %jd,%ld %jd,%ld %jd,%ld",
139 		    (intmax_t)start.tv_sec, start.tv_usec,
140 		    (intmax_t)ut.tv_sec, ut.tv_usec,
141 		    (intmax_t)st.tv_sec, st.tv_usec);
142 	} else
143 		sbuf_printf(sb, " -1,-1 -1,-1 -1,-1");
144 
145 	sbuf_printf(sb, " %s", wmesg);
146 
147 	cr = p->p_ucred;
148 
149 	sbuf_printf(sb, " %lu %lu %lu",
150 		(u_long)cr->cr_uid,
151 		(u_long)cr->cr_ruid,
152 		(u_long)cr->cr_rgid);
153 
154 	/* egid (cr->cr_svgid) is equal to cr_ngroups[0]
155 	   see also getegid(2) in /sys/kern/kern_prot.c */
156 
157 	for (i = 0; i < cr->cr_ngroups; i++) {
158 		sbuf_printf(sb, ",%lu", (u_long)cr->cr_groups[i]);
159 	}
160 
161 	if (jailed(p->p_ucred)) {
162 		mtx_lock(&p->p_ucred->cr_prison->pr_mtx);
163 		sbuf_printf(sb, " %s", p->p_ucred->cr_prison->pr_host);
164 		mtx_unlock(&p->p_ucred->cr_prison->pr_mtx);
165 	} else {
166 		sbuf_printf(sb, " -");
167 	}
168 	PROC_UNLOCK(p);
169 	sbuf_printf(sb, "\n");
170 
171 	return (0);
172 }
173 
174 int
175 procfs_doproccmdline(PFS_FILL_ARGS)
176 {
177 	struct ps_strings pstr;
178 	char **ps_argvstr;
179 	int error, i;
180 
181 	/*
182 	 * If we are using the ps/cmdline caching, use that.  Otherwise
183 	 * revert back to the old way which only implements full cmdline
184 	 * for the currept process and just p->p_comm for all other
185 	 * processes.
186 	 * Note that if the argv is no longer available, we deliberately
187 	 * don't fall back on p->p_comm or return an error: the authentic
188 	 * Linux behaviour is to return zero-length in this case.
189 	 */
190 
191 	PROC_LOCK(p);
192 	if (p->p_args && p_cansee(td, p) == 0) {
193 		sbuf_bcpy(sb, p->p_args->ar_args, p->p_args->ar_length);
194 		PROC_UNLOCK(p);
195 		return (0);
196 	}
197 	PROC_UNLOCK(p);
198 	if (p != td->td_proc) {
199 		sbuf_printf(sb, "%.*s", MAXCOMLEN, p->p_comm);
200 	} else {
201 		error = copyin((void *)p->p_sysent->sv_psstrings, &pstr,
202 		    sizeof(pstr));
203 		if (error)
204 			return (error);
205 		if (pstr.ps_nargvstr > ARG_MAX)
206 			return (E2BIG);
207 		ps_argvstr = malloc(pstr.ps_nargvstr * sizeof(char *),
208 		    M_TEMP, M_WAITOK);
209 		error = copyin((void *)pstr.ps_argvstr, ps_argvstr,
210 		    pstr.ps_nargvstr * sizeof(char *));
211 		if (error) {
212 			free(ps_argvstr, M_TEMP);
213 			return (error);
214 		}
215 		for (i = 0; i < pstr.ps_nargvstr; i++) {
216 			sbuf_copyin(sb, ps_argvstr[i], 0);
217 			sbuf_printf(sb, "%c", '\0');
218 		}
219 		free(ps_argvstr, M_TEMP);
220 	}
221 
222 	return (0);
223 }
224