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/stat.h>
22 #include <sys/sysctl.h>
23 #include <sys/user.h>
24
25 #include <err.h>
26 #include <errno.h>
27 #include <event.h>
28 #include <stdint.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <unistd.h>
32 #include <libutil.h>
33
34 struct kinfo_proc *cmp_procs(struct kinfo_proc *, struct kinfo_proc *);
35 char *osdep_get_name(int, char *);
36 char *osdep_get_cwd(int);
37 struct event_base *osdep_event_init(void);
38
39 #ifndef nitems
40 #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
41 #endif
42
43 #define is_runnable(p) \
44 ((p)->ki_stat == SRUN || (p)->ki_stat == SIDL)
45 #define is_stopped(p) \
46 ((p)->ki_stat == SSTOP || (p)->ki_stat == SZOMB)
47
48 struct kinfo_proc *
cmp_procs(struct kinfo_proc * p1,struct kinfo_proc * p2)49 cmp_procs(struct kinfo_proc *p1, struct kinfo_proc *p2)
50 {
51 if (is_runnable(p1) && !is_runnable(p2))
52 return (p1);
53 if (!is_runnable(p1) && is_runnable(p2))
54 return (p2);
55
56 if (is_stopped(p1) && !is_stopped(p2))
57 return (p1);
58 if (!is_stopped(p1) && is_stopped(p2))
59 return (p2);
60
61 if (p1->ki_estcpu > p2->ki_estcpu)
62 return (p1);
63 if (p1->ki_estcpu < p2->ki_estcpu)
64 return (p2);
65
66 if (p1->ki_slptime < p2->ki_slptime)
67 return (p1);
68 if (p1->ki_slptime > p2->ki_slptime)
69 return (p2);
70
71 if (strcmp(p1->ki_comm, p2->ki_comm) < 0)
72 return (p1);
73 if (strcmp(p1->ki_comm, p2->ki_comm) > 0)
74 return (p2);
75
76 if (p1->ki_pid > p2->ki_pid)
77 return (p1);
78 return (p2);
79 }
80
81 char *
osdep_get_name(int fd,char * tty)82 osdep_get_name(int fd, char *tty)
83 {
84 int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PGRP, 0 };
85 struct stat sb;
86 size_t len;
87 struct kinfo_proc *buf, *newbuf, *bestp;
88 u_int i;
89 char *name;
90
91 buf = NULL;
92
93 if (stat(tty, &sb) == -1)
94 return (NULL);
95 if ((mib[3] = tcgetpgrp(fd)) == -1)
96 return (NULL);
97
98 retry:
99 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) == -1)
100 return (NULL);
101 len = (len * 5) / 4;
102
103 if ((newbuf = realloc(buf, len)) == NULL)
104 goto error;
105 buf = newbuf;
106
107 if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) == -1) {
108 if (errno == ENOMEM)
109 goto retry;
110 goto error;
111 }
112
113 bestp = NULL;
114 for (i = 0; i < len / sizeof (struct kinfo_proc); i++) {
115 if (buf[i].ki_tdev != sb.st_rdev)
116 continue;
117 if (bestp == NULL)
118 bestp = &buf[i];
119 else
120 bestp = cmp_procs(&buf[i], bestp);
121 }
122
123 name = NULL;
124 if (bestp != NULL)
125 name = strdup(bestp->ki_comm);
126
127 free(buf);
128 return (name);
129
130 error:
131 free(buf);
132 return (NULL);
133 }
134
135 char *
osdep_get_cwd(int fd)136 osdep_get_cwd(int fd)
137 {
138 static char wd[PATH_MAX];
139 struct kinfo_file *info = NULL;
140 pid_t pgrp;
141 int nrecords, i;
142
143 if ((pgrp = tcgetpgrp(fd)) == -1)
144 return (NULL);
145
146 if ((info = kinfo_getfile(pgrp, &nrecords)) == NULL)
147 return (NULL);
148
149 for (i = 0; i < nrecords; i++) {
150 if (info[i].kf_fd == KF_FD_TYPE_CWD) {
151 strlcpy(wd, info[i].kf_path, sizeof wd);
152 free(info);
153 return (wd);
154 }
155 }
156
157 free(info);
158 return (NULL);
159 }
160
161 struct event_base *
osdep_event_init(void)162 osdep_event_init(void)
163 {
164 /*
165 * On some versions of FreeBSD, kqueue doesn't work properly on tty
166 * file descriptors. This is fixed in recent FreeBSD versions.
167 */
168 setenv("EVENT_NOKQUEUE", "1", 1);
169 return (event_init());
170 }
171