1 /* $OpenBSD: procname.c,v 1.20 2022/02/22 17:35:01 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/types.h>
20 #include <sys/signal.h>
21 #include <sys/proc.h>
22 #include <sys/sysctl.h>
23 #include <sys/stat.h>
24
25 #include <errno.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <unistd.h>
29
30 #ifndef nitems
31 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
32 #endif
33
34 #define is_runnable(p) \
35 ((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC)
36 #define is_stopped(p) \
37 ((p)->p_stat == SSTOP || (p)->p_stat == SDEAD)
38
39 static struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
40 char *get_proc_name(int, char *);
41 char *get_proc_cwd(int);
42
43 static struct kinfo_proc *
cmp_procs(struct kinfo_proc * p1,struct kinfo_proc * p2)44 cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
45 {
46 if (is_runnable(p1) && !is_runnable(p2))
47 return (p1);
48 if (!is_runnable(p1) && is_runnable(p2))
49 return (p2);
50
51 if (is_stopped(p1) && !is_stopped(p2))
52 return (p1);
53 if (!is_stopped(p1) && is_stopped(p2))
54 return (p2);
55
56 if (p1->p_estcpu > p2->p_estcpu)
57 return (p1);
58 if (p1->p_estcpu < p2->p_estcpu)
59 return (p2);
60
61 if (p1->p_slptime < p2->p_slptime)
62 return (p1);
63 if (p1->p_slptime > p2->p_slptime)
64 return (p2);
65
66 if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR))
67 return (p1);
68 if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR))
69 return (p2);
70
71 if (strcmp(p1->p_comm, p2->p_comm) < 0)
72 return (p1);
73 if (strcmp(p1->p_comm, p2->p_comm) > 0)
74 return (p2);
75
76 if (p1->p_pid > p2->p_pid)
77 return (p1);
78 return (p2);
79 }
80
81 char *
get_proc_name(int fd,char * tty)82 get_proc_name(int fd, char *tty)
83 {
84 int mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0,
85 sizeof(struct kinfo_proc), 0 };
86 struct stat sb;
87 size_t len;
88 struct kinfo_proc *buf, *newbuf, *bestp;
89 u_int i;
90 char *name;
91
92 buf = NULL;
93
94 if (stat(tty, &sb) == -1)
95 return (NULL);
96 if ((mib[3] = tcgetpgrp(fd)) == -1)
97 return (NULL);
98
99 retry:
100 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
101 goto error;
102 len = (len * 5) / 4;
103
104 if ((newbuf = realloc(buf, len)) == NULL)
105 goto error;
106 buf = newbuf;
107
108 mib[5] = (int)(len / sizeof(struct kinfo_proc));
109 if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
110 if (errno == ENOMEM)
111 goto retry;
112 goto error;
113 }
114
115 bestp = NULL;
116 for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
117 if ((dev_t)buf[i].p_tdev != sb.st_rdev)
118 continue;
119 if (bestp == NULL)
120 bestp = &buf[i];
121 else
122 bestp = cmp_procs(&buf[i], bestp);
123 }
124
125 name = NULL;
126 if (bestp != NULL)
127 name = strdup(bestp->p_comm);
128
129 free(buf);
130 return (name);
131
132 error:
133 free(buf);
134 return (NULL);
135 }
136
137 char *
get_proc_cwd(int fd)138 get_proc_cwd(int fd)
139 {
140 int name[] = { CTL_KERN, KERN_PROC_CWD, 0 };
141 static char path[PATH_MAX];
142 size_t pathlen = sizeof path;
143
144 if ((name[2] = tcgetpgrp(fd)) == -1)
145 return (NULL);
146 if (sysctl(name, 3, path, &pathlen, NULL, 0) != 0)
147 return (NULL);
148 return (path);
149 }
150