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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
#include <u.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <errno.h>
#include <fcntl.h>
#include <libc.h>
#include "rc.h"
#include "exec.h"
#include "io.h"
#include "fns.h"
#include "getflags.h"
extern char **mkargv(word*);
extern int mapfd(int);
static char *eargs = "cdflmnstuv";
static int rlx[] = {
RLIMIT_CORE,
RLIMIT_DATA,
RLIMIT_FSIZE,
#ifdef RLIMIT_MEMLOCK
RLIMIT_MEMLOCK,
#else
0,
#endif
#ifdef RLIMIT_RSS
RLIMIT_RSS,
#else
0,
#endif
RLIMIT_NOFILE,
RLIMIT_STACK,
RLIMIT_CPU,
#ifdef RLIMIT_NPROC
RLIMIT_NPROC,
#else
0,
#endif
#ifdef RLIMIT_RSS
RLIMIT_RSS,
#else
0,
#endif
};
static void
eusage(void)
{
fprint(mapfd(2), "usage: ulimit [-SHa%s [limit]]\n", eargs);
}
#define Notset -4
#define Unlimited -3
#define Hard -2
#define Soft -1
void
execulimit(void)
{
int fd, n, argc, sethard, setsoft, limit;
int flag[256];
char **argv, **oargv, *p;
char *argv0;
struct rlimit rl;
argv0 = nil;
setstatus("");
oargv = mkargv(runq->argv->words);
argv = oargv+1;
for(argc=0; argv[argc]; argc++)
;
memset(flag, 0, sizeof flag);
ARGBEGIN{
default:
if(strchr(eargs, ARGC()) == nil){
eusage();
return;
}
case 'S':
case 'H':
case 'a':
flag[ARGC()] = 1;
break;
}ARGEND
if(argc > 1){
eusage();
goto out;
}
fd = mapfd(1);
sethard = 1;
setsoft = 1;
if(flag['S'] && flag['H'])
;
else if(flag['S'])
sethard = 0;
else if(flag['H'])
setsoft = 0;
limit = Notset;
if(argc>0){
if(strcmp(argv[0], "unlimited") == 0)
limit = Unlimited;
else if(strcmp(argv[0], "hard") == 0)
limit = Hard;
else if(strcmp(argv[0], "soft") == 0)
limit = Soft;
else if((limit = strtol(argv[0], &p, 0)) < 0 || *p != 0){
eusage();
goto out;
}
}
if(flag['a']){
for(p=eargs; *p; p++){
getrlimit(rlx[p-eargs], &rl);
n = flag['H'] ? rl.rlim_max : rl.rlim_cur;
if(n == -1)
fprint(fd, "ulimit -%c unlimited\n", *p);
else
fprint(fd, "ulimit -%c %d\n", *p, n);
}
goto out;
}
for(p=eargs; *p; p++){
if(flag[(uchar)*p]){
n = 0;
getrlimit(rlx[p-eargs], &rl);
switch(limit){
case Notset:
n = flag['H'] ? rl.rlim_max : rl.rlim_cur;
if(n == -1)
fprint(fd, "ulimit -%c unlimited\n", *p);
else
fprint(fd, "ulimit -%c %d\n", *p, n);
break;
case Hard:
n = rl.rlim_max;
goto set;
case Soft:
n = rl.rlim_cur;
goto set;
case Unlimited:
n = -1;
goto set;
default:
n = limit;
set:
if(setsoft)
rl.rlim_cur = n;
if(sethard)
rl.rlim_max = n;
if(setrlimit(rlx[p-eargs], &rl) < 0)
fprint(mapfd(2), "setrlimit: %r\n");
}
}
}
out:
free(oargv);
poplist();
flush(err);
}
void
execumask(void)
{
int n, argc;
char **argv, **oargv, *p;
char *argv0;
argv0 = nil;
setstatus("");
oargv = mkargv(runq->argv->words);
argv = oargv+1;
for(argc=0; argv[argc]; argc++)
;
ARGBEGIN{
default:
usage:
fprint(mapfd(2), "usage: umask [mode]\n");
goto out;
}ARGEND
if(argc > 1)
goto usage;
if(argc == 1){
n = strtol(argv[0], &p, 8);
if(*p != 0 || p == argv[0])
goto usage;
umask(n);
goto out;
}
n = umask(0);
umask(n);
if(n < 0){
fprint(mapfd(2), "umask: %r\n");
goto out;
}
fprint(mapfd(1), "umask %03o\n", n);
out:
free(oargv);
poplist();
flush(err);
}
/*
* Cope with non-blocking read.
*/
long
readnb(int fd, char *buf, long cnt)
{
int n, didreset;
int flgs;
didreset = 0;
again:
n = read(fd, buf, cnt);
if(n == -1)
if(errno == EAGAIN){
if(!didreset){
if((flgs = fcntl(fd, F_GETFL, 0)) == -1)
return -1;
flgs &= ~O_NONBLOCK;
if(fcntl(fd, F_SETFL, flgs) == -1)
return -1;
didreset = 1;
}
goto again;
}
return n;
}
|