1 /* $OpenBSD$ */
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/param.h> /* MAXCOMLEN */
20 #include <sys/types.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 #include "compat.h"
31
32 #ifndef nitems
33 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
34 #endif
35
36 #define is_runnable(p) \
37 ((p)->p_stat == SRUN || (p)->p_stat == SIDL || (p)->p_stat == SONPROC)
38 #define is_stopped(p) \
39 ((p)->p_stat == SSTOP || (p)->p_stat == SDEAD)
40
41 static struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
42 char *osdep_get_name(int, char *);
43 char *osdep_get_cwd(int);
44 struct event_base *osdep_event_init(void);
45
46 static struct kinfo_proc *
cmp_procs(struct kinfo_proc * p1,struct kinfo_proc * p2)47 cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
48 {
49 if (is_runnable(p1) && !is_runnable(p2))
50 return (p1);
51 if (!is_runnable(p1) && is_runnable(p2))
52 return (p2);
53
54 if (is_stopped(p1) && !is_stopped(p2))
55 return (p1);
56 if (!is_stopped(p1) && is_stopped(p2))
57 return (p2);
58
59 if (p1->p_estcpu > p2->p_estcpu)
60 return (p1);
61 if (p1->p_estcpu < p2->p_estcpu)
62 return (p2);
63
64 if (p1->p_slptime < p2->p_slptime)
65 return (p1);
66 if (p1->p_slptime > p2->p_slptime)
67 return (p2);
68
69 if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR))
70 return (p1);
71 if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR))
72 return (p2);
73
74 if (strcmp(p1->p_comm, p2->p_comm) < 0)
75 return (p1);
76 if (strcmp(p1->p_comm, p2->p_comm) > 0)
77 return (p2);
78
79 if (p1->p_pid > p2->p_pid)
80 return (p1);
81 return (p2);
82 }
83
84 char *
osdep_get_name(int fd,char * tty)85 osdep_get_name(int fd, char *tty)
86 {
87 int mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0,
88 sizeof(struct kinfo_proc), 0 };
89 struct stat sb;
90 size_t len;
91 struct kinfo_proc *buf, *newbuf, *bestp;
92 u_int i;
93 char *name;
94
95 buf = NULL;
96
97 if (stat(tty, &sb) == -1)
98 return (NULL);
99 if ((mib[3] = tcgetpgrp(fd)) == -1)
100 return (NULL);
101
102 retry:
103 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
104 goto error;
105 len = (len * 5) / 4;
106
107 if ((newbuf = realloc(buf, len)) == NULL)
108 goto error;
109 buf = newbuf;
110
111 mib[5] = (int)(len / sizeof(struct kinfo_proc));
112 if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
113 if (errno == ENOMEM)
114 goto retry;
115 goto error;
116 }
117
118 bestp = NULL;
119 for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
120 if ((dev_t)buf[i].p_tdev != sb.st_rdev)
121 continue;
122 if (bestp == NULL)
123 bestp = &buf[i];
124 else
125 bestp = cmp_procs(&buf[i], bestp);
126 }
127
128 name = NULL;
129 if (bestp != NULL)
130 name = strdup(bestp->p_comm);
131
132 free(buf);
133 return (name);
134
135 error:
136 free(buf);
137 return (NULL);
138 }
139
140 char *
osdep_get_cwd(int fd)141 osdep_get_cwd(int fd)
142 {
143 int name[] = { CTL_KERN, KERN_PROC_CWD, 0 };
144 static char path[MAXPATHLEN];
145 size_t pathlen = sizeof path;
146
147 if ((name[2] = tcgetpgrp(fd)) == -1)
148 return (NULL);
149 if (sysctl(name, 3, path, &pathlen, NULL, 0) != 0)
150 return (NULL);
151 return (path);
152 }
153
154 struct event_base *
osdep_event_init(void)155 osdep_event_init(void)
156 {
157 return (event_init());
158 }
159