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>
20 #include <sys/proc.h>
21 #include <sys/stat.h>
22 #include <sys/sysctl.h>
23
24 #include <errno.h>
25 #include <limits.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <unistd.h>
29
30 #include "tmux.h"
31
32 #define is_runnable(p) \
33 ((p)->p_stat == LSRUN || (p)->p_stat == SIDL)
34 #define is_stopped(p) \
35 ((p)->p_stat == SSTOP || (p)->p_stat == SZOMB)
36
37 struct kinfo_proc2 *cmp_procs(struct kinfo_proc2 *, struct kinfo_proc2 *);
38
39 struct kinfo_proc2 *
cmp_procs(struct kinfo_proc2 * p1,struct kinfo_proc2 * p2)40 cmp_procs(struct kinfo_proc2 *p1, struct kinfo_proc2 *p2)
41 {
42 if (is_runnable(p1) && !is_runnable(p2))
43 return (p1);
44 if (!is_runnable(p1) && is_runnable(p2))
45 return (p2);
46
47 if (is_stopped(p1) && !is_stopped(p2))
48 return (p1);
49 if (!is_stopped(p1) && is_stopped(p2))
50 return (p2);
51
52 if (p1->p_estcpu > p2->p_estcpu)
53 return (p1);
54 if (p1->p_estcpu < p2->p_estcpu)
55 return (p2);
56
57 if (p1->p_slptime < p2->p_slptime)
58 return (p1);
59 if (p1->p_slptime > p2->p_slptime)
60 return (p2);
61
62 if (p1->p_pid > p2->p_pid)
63 return (p1);
64 return (p2);
65 }
66
67 char *
osdep_get_name(int fd,__unused char * tty)68 osdep_get_name(int fd, __unused char *tty)
69 {
70 int mib[6];
71 struct stat sb;
72 size_t len, i;
73 struct kinfo_proc2 *buf, *newbuf, *bestp;
74 char *name;
75
76 if (stat(tty, &sb) == -1)
77 return (NULL);
78 if ((mib[3] = tcgetpgrp(fd)) == -1)
79 return (NULL);
80
81 buf = NULL;
82 len = sizeof bestp;
83
84 mib[0] = CTL_KERN;
85 mib[1] = KERN_PROC2;
86 mib[2] = KERN_PROC_PGRP;
87 mib[4] = sizeof *buf;
88
89 retry:
90 mib[5] = 0;
91
92 if (sysctl(mib, __arraycount(mib), NULL, &len, NULL, 0) == -1)
93 return (NULL);
94
95 if ((newbuf = realloc(buf, len)) == NULL)
96 goto error;
97 buf = newbuf;
98
99 mib[5] = len / (sizeof *buf);
100 if (sysctl(mib, __arraycount(mib), buf, &len, NULL, 0) == -1) {
101 if (errno == ENOMEM)
102 goto retry;
103 goto error;
104 }
105
106 bestp = NULL;
107 for (i = 0; i < len / (sizeof *buf); i++) {
108 if (buf[i].p_tdev != sb.st_rdev)
109 continue;
110 if (bestp == NULL)
111 bestp = &buf[i];
112 else
113 bestp = cmp_procs(&buf[i], bestp);
114 }
115
116 name = NULL;
117 if (bestp != NULL)
118 name = strdup(bestp->p_comm);
119
120 free(buf);
121 return (name);
122
123 error:
124 free(buf);
125 return (NULL);
126 }
127
128 char *
osdep_get_cwd(int fd)129 osdep_get_cwd(int fd)
130 {
131 static char target[PATH_MAX + 1];
132 pid_t pgrp;
133 #ifdef KERN_PROC_CWD
134 int mib[4];
135 size_t len;
136 #else
137 char *path;
138 ssize_t n;
139 #endif
140
141 if ((pgrp = tcgetpgrp(fd)) == -1)
142 return (NULL);
143
144 #ifdef KERN_PROC_CWD
145 mib[0] = CTL_KERN;
146 mib[1] = KERN_PROC_ARGS;
147 mib[2] = pgrp;
148 mib[3] = KERN_PROC_CWD;
149 len = sizeof(target);
150 if (sysctl(mib, __arraycount(mib), target, &len, NULL, 0) == 0)
151 return (target);
152 #else
153 xasprintf(&path, "/proc/%lld/cwd", (long long) pgrp);
154 n = readlink(path, target, sizeof(target) - 1);
155 free(path);
156 if (n > 0) {
157 target[n] = '\0';
158 return (target);
159 }
160 #endif
161
162 return (NULL);
163 }
164
165 struct event_base *
osdep_event_init(void)166 osdep_event_init(void)
167 {
168 return (event_init());
169 }
170