1 /* Id */
2
3 /*
4 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
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>
20 #include <sys/proc.h>
21 #include <sys/sysctl.h>
22 #include <sys/stat.h>
23
24 #include <errno.h>
25 #include <event.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 == SZOMB || (p)->p_stat == SDEAD)
38
39 struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
40 char *osdep_get_name(int, char *);
41 char *osdep_get_cwd(int);
42 struct event_base *osdep_event_init(void);
43
44 struct kinfo_proc *
cmp_procs(struct kinfo_proc * p1,struct kinfo_proc * p2)45 cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
46 {
47 if (is_runnable(p1) && !is_runnable(p2))
48 return (p1);
49 if (!is_runnable(p1) && is_runnable(p2))
50 return (p2);
51
52 if (is_stopped(p1) && !is_stopped(p2))
53 return (p1);
54 if (!is_stopped(p1) && is_stopped(p2))
55 return (p2);
56
57 if (p1->p_estcpu > p2->p_estcpu)
58 return (p1);
59 if (p1->p_estcpu < p2->p_estcpu)
60 return (p2);
61
62 if (p1->p_slptime < p2->p_slptime)
63 return (p1);
64 if (p1->p_slptime > p2->p_slptime)
65 return (p2);
66
67 if ((p1->p_flag & P_SINTR) && !(p2->p_flag & P_SINTR))
68 return (p1);
69 if (!(p1->p_flag & P_SINTR) && (p2->p_flag & P_SINTR))
70 return (p2);
71
72 if (strcmp(p1->p_comm, p2->p_comm) < 0)
73 return (p1);
74 if (strcmp(p1->p_comm, p2->p_comm) > 0)
75 return (p2);
76
77 if (p1->p_pid > p2->p_pid)
78 return (p1);
79 return (p2);
80 }
81
82 char *
osdep_get_name(int fd,char * tty)83 osdep_get_name(int fd, char *tty)
84 {
85 int mib[6] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0,
86 sizeof(struct kinfo_proc), 0 };
87 struct stat sb;
88 size_t len;
89 struct kinfo_proc *buf, *newbuf, *bestp;
90 u_int i;
91 char *name;
92
93 buf = NULL;
94
95 if (stat(tty, &sb) == -1)
96 return (NULL);
97 if ((mib[3] = tcgetpgrp(fd)) == -1)
98 return (NULL);
99
100 retry:
101 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
102 return (NULL);
103 len = (len * 5) / 4;
104
105 if ((newbuf = realloc(buf, len)) == NULL)
106 goto error;
107 buf = newbuf;
108
109 mib[5] = (int)(len / sizeof(struct kinfo_proc));
110 if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
111 if (errno == ENOMEM)
112 goto retry;
113 goto error;
114 }
115
116 bestp = NULL;
117 for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
118 if ((dev_t)buf[i].p_tdev != sb.st_rdev)
119 continue;
120 if (bestp == NULL)
121 bestp = &buf[i];
122 else
123 bestp = cmp_procs(&buf[i], bestp);
124 }
125
126 name = NULL;
127 if (bestp != NULL)
128 name = strdup(bestp->p_comm);
129
130 free(buf);
131 return (name);
132
133 error:
134 free(buf);
135 return (NULL);
136 }
137
138 char *
osdep_get_cwd(int fd)139 osdep_get_cwd(int fd)
140 {
141 int name[] = { CTL_KERN, KERN_PROC_CWD, 0 };
142 static char path[MAXPATHLEN];
143 size_t pathlen = sizeof path;
144
145 if ((name[2] = tcgetpgrp(fd)) == -1)
146 return (NULL);
147 if (sysctl(name, 3, path, &pathlen, NULL, 0) != 0)
148 return (NULL);
149 return (path);
150 }
151
152 struct event_base *
osdep_event_init(void)153 osdep_event_init(void)
154 {
155 return (event_init());
156 }
157