1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/* ps.c - show process list
*
* Copyright 2015 Rob Landley <rob@landley.net>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ps.html
* And http://kernel.org/doc/Documentation/filesystems/proc.txt Table 1-4
* And linux kernel source fs/proc/array.c function do_task_stat()
*
* Deviation from posix: no -n
USE_PS(NEWTOY(ps, "aAdeo*", TOYFLAG_USR|TOYFLAG_BIN))
config PS
bool "ps"
default n
help
usage: ps [-Aade] [-fl] [-gG GROUP] [-o FIELD] [-p PID] [-t TTY] [-u USER]
List processes.
-A All processes
-a Processes with terminals, except session leaders
-d Processes that aren't session leaders
-e Same as -A
-f Full listing
-g Processes belonging to these session leaders
-G Processes with these real group IDs
-l Long listing
-o Show FIELDS for each process
-p select by PID
-t select by TTY
-u select by USER
-U select by USER
GROUP, FIELD, PID, TTY, and USER are comma separated lists.
OUTPUT (-o) FIELDS:
S Linux defines the process state letters as:
R (running) S (sleeping) D (disk sleep) T (stopped) t (tracing stop)
Z (zombie) X (dead) x (dead) K (wakekill) W (waking)
F Process flags (PF_*) from linux source file include/sched.h
(in octal rather than hex because posix inexplicably says so)
Default is PID,TTY,TIME,CMD With -f UID,PID,PPID,C,STIME,TTY,TIME,CMD
With -l F,S,UID,PID,PPID,C,PRI,NI,ADDR,SZ,WCHAN,TTY,TIME,CMD
*/
#define FOR_ps
#include "toys.h"
GLOBALS(
struct arg_list *o;
unsigned width;
dev_t tty;
void *oo;
)
/*
l l fl a fl fl l l l l l f a a a
F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
ruser user rgroup group pid ppid pgid pcpu vsz nice etime time tty comm args
todo: thread support /proc/$d/task/%d/stat
man page: F flags mean...
*/
// dirtree callback.
// toybuf used as: 1024 /proc/$PID/stat, 1024 slot[], 2048 /proc/$PID/cmdline
static int do_ps(struct dirtree *new)
{
long long *slot = (void *)(toybuf+1024);
char *name, *s, state;
int nlen, slots, i, field, width = TT.width, idxes[] = {0, -1, -2, -3};
struct passwd *pw;
struct group *gr;
width=18;
if (!new->parent) return DIRTREE_RECURSE;
if (!(*slot = atol(new->name))) return 0;
// name field limited to 256 bytes by VFS, plus 40 fields * max 20 chars:
// 1000-ish total, but some forced zero so actually there's headroom.
sprintf(toybuf, "%lld/stat", *slot);
if (!readfileat(dirtree_parentfd(new), toybuf, toybuf, 1024)) return 0;
// parse oddball fields (name and state)
if (!(s = strchr(toybuf, '('))) return 0;
for (name = ++s; *s != ')'; s++) if (!*s) return 0;
nlen = s++-name;
if (1>sscanf(++s, " %c%n", &state, &i)) return 0;
// parse numeric fields
for (slots = 1; slots<100; slots++)
if (1>sscanf(s += i, " %lld%n", slot+slots, &i)) break;
// skip entries we don't care about.
if ((toys.optflags&(FLAG_a|FLAG_d)) && getsid(*slot)==*slot) return 0;
if ((toys.optflags&FLAG_a) && !slot[4]) return 0;
if (!(toys.optflags*(FLAG_a|FLAG_d|FLAG_A|FLAG_e)) && TT.tty!=slot[4])
return 0;
// default: pidi=1 user time args
for (field = 0; field<ARRAY_LEN(idxes); field++) {
char *out = toybuf+2048;
int idx = idxes[field];
// Default: unsupported
sprintf(out, "-");
// Our tests here are in octal to match \123 character escapes in typos[]
// Print a raw stat field?
if (idx<0300)
sprintf(out, (char *[]){"%lld","%llx","%llo"}[idx>>6], slot[idx&63]);
else if (idx == 0300) sprintf(out, "%c", state); // S
else if (idx == 0301 || idx == 0302) { // UID and USER
sprintf(out, "%d", new->st.st_uid);
if (idx == 302 || (toys.optflags&FLAG_f)) {
struct passwd *pw = getpwuid(new->st.st_uid);
if (pw) out = pw->pw_name;
}
} else if (idx == 0303); // C (unsupported for now)
else if (idx == 0304) // SZ
sprintf(out, "%lld", slot[22]/4096);
else if (idx == 0305) { // WCHAN
sprintf(toybuf+512, "%lld/wchan");
readfileat(dirtree_parentfd(new), toybuf+512, out, 2047);
// time
} else if (idx == -2) {
long seconds = (slot[11]+(idx==-3)*slot[12])/sysconf(_SC_CLK_TCK),
ll = 60*60*24;
for (s = out, i = 0; i<4; i++) {
if (i>1 || seconds > ll)
s += sprintf(s, "%*ld%c", 2*(i==3), seconds/ll, "-::"[i]);
ll /= i ? 60 : 24;
}
// Command line limited to 2k displayable. We could dynamically malloc, but
// it'd almost never get used, querying length of a proc file is awkward,
// fixed buffer is nommu friendly... Waiting for somebody to complain. :)
} else if (idx == -3) {
int fd, len = 0;
sprintf(out, "%lld/cmdline", *slot);
fd = openat(dirtree_parentfd(new), out, O_RDONLY);
if (fd != -1) {
if (0<(len = read(fd, out, 2047))) {
out[len] = 0;
for (i = 0; i<len; i++) if (out[i] < ' ') out[i] = ' ';
}
close(fd);
}
if (len<1) sprintf(out, "[%.*s]", nlen, name);
}
printf(" %*.*s", width, width, out);
}
xputc('\n');
return 0;
}
void ps_main(void)
{
int i, fd = -1;
// Octal output code followed by header name
char *typos[] = {
"\207F", "\300S", "\301UID", "\0PID", "\02PPID", "\303C", "\20PRI",
"\21NI", "\34ADDR", "\304SZ", "\305WCHAN", "STIME", "TTY", "TIME", "CMD"
};
// l l fl a fl fl l l l l l f a a a
// F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
// 7
TT.width = 80;
terminal_size(&TT.width, 0);
// find controlling tty, falling back to /dev/tty if none
for (i = fd = 0; i < 4; i++) {
struct stat st;
if (i != 3 || -1 != (i = fd = open("/dev/tty", O_RDONLY))) {
if (isatty(i) && !fstat(i, &st)) {
TT.tty = st.st_rdev;
break;
}
}
}
if (fd != -1) close(fd);
if (FLAG_o) {
printf("todo\n");
} else {
short def = 0x0807;
if (toys.optflags&FLAG_f) def = 0x1e0f;
if (toys.optflags&FLAG_l) def = 0x7ff7;
// order of fields[] matches posix STDOUT section, so add enabled XSI
// defaults according to bitmask
}
printf("pid user time args\n");
dirtree_read("/proc", do_ps);
}
|
