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linux[3.13.0-29-generic][system[GNU C Library (GNU libc) stable release version 2.21, by Roland McGrath et al.]][ext4_loop[mke2fs 1.42.9 (4-Feb-2014)]]@[2015-07-24T13:23:26Z./nix/store/fxisrpncjn4cxxwnq2lvilriqx63s9k9-fs_test]

Checked Trace
linux_spec@[/nix/store/fxisrpncjn4cxxwnq2lvilriqx63s9k9-fs_test] sexp stdout stderr
Traced Execution stdout stderr
Script script

Combined Trace

1 # processing file 'adhoc_write_coherence-int.trace' ...
2 @type trace
3
4 # Test interactions between writes to shared fds
5
6 # First, just check read/write
7 open "f1.txt" [O_CREAT;O_RDWR] 0o600
8 Tau
9 RV_num(3)
10 write! (FD 3) "0123456789" 10
11 Tau
12 RV_num(10)
13
14 pread! (FD 3) 3 2
15 Tau
16 RV_bytes("234")
17
18 open "f1.txt" [O_CREAT;O_RDWR] 0o600
19 Tau
20 RV_num(4)
21 read! (FD 4) 3
22 Tau
23 RV_bytes("012")
24 write! (FD 4) "!@#" 3
25 Tau
26 RV_num(3)
27
28 write! (FD 3) "ABCDEFGHIJ" 10
29 Tau
30 RV_num(10)
31
32 pread! (FD 3) 100 0
33 Tau
34 RV_bytes("012!@#6789ABCDEFGHIJ")
35 pread! (FD 4) 100 0
36 Tau
37 RV_bytes("012!@#6789ABCDEFGHIJ")
38
39
40 # truncate is a kind of mutation
41
42 truncate "f1.txt" 15
43 Tau
44 RV_none
45
46 pread! (FD 4) 100 0
47 Tau
48 RV_bytes("012!@#6789ABCDE")
49 pread! (FD 3) 100 0
50 Tau
51 RV_bytes("012!@#6789ABCDE")
52
53 # and truncation can happen during open
54
55 open "f1.txt" [O_TRUNC;O_APPEND;O_RDWR]
56 Tau
57 RV_num(5)
58
59 pread! (FD 4) 100 0
60 Tau
61 RV_bytes("")
62 pread! (FD 3) 100 0
63 Tau
64 RV_bytes("")
65
66 # where's the cursor?
67
68 write! (FD 3) "abc" 3
69 Tau
70 RV_num(3)
71 write! (FD 4) "def" 3
72 Tau
73 RV_num(3)
74
75 pread! (FD 5) 100 0
76 Tau
77 RV_bytes("\000\000\000\000\000\000def\000\000\000\000\000\000\000\000\000\000\000abc")
78
79 write! (FD 5) "|/-\\|" 5
80 Tau
81 RV_num(5)
82
83 pread! (FD 3) 100 0
84 Tau
85 RV_bytes("\000\000\000\000\000\000def\000\000\000\000\000\000\000\000\000\000\000abc|/-\\|")
86 read! (FD 3) 100
87 Tau
88 RV_bytes("|/-\\|")
89 read! (FD 4) 100
90 Tau
91 RV_bytes("\000\000\000\000\000\000\000\000\000\000\000abc|/-\\|")
92
93 write! (FD 4) "zyxwv" 5
94 Tau
95 RV_num(5)
96 read! (FD 5) 100
97 Tau
98 RV_bytes("zyxwv")
99
100 write! (FD 3) "01234567890123456789" 20
101 Tau
102 RV_num(20)
103 pread! (FD 4) 100 0
104 Tau
105 RV_bytes("\000\000\000\000\000\000def\000\000\000\000\000\000\000\000\000\000\000abc|/-\\|01234567890123456789")
106 write! (FD 5) "appended!" 9
107 Tau
108 RV_num(9)
109 read! (FD 4) 100
110 Tau
111 RV_bytes("567890123456789appended!")
112
113 pread! (FD 3) 100 0
114 Tau
115 RV_bytes("\000\000\000\000\000\000def\000\000\000\000\000\000\000\000\000\000\000abc|/-\\|01234567890123456789appended!")
116
117 # Let's go multiprocess!
118
119 Pid 2 -> create (User_id 0) (Group_id 0)
120
121 Pid 2 -> open "f1.txt" [O_TRUNC;O_RDWR]
122 Tau
123 RV_num(3)
124
125 pread! (FD 3) 100 0
126 Tau
127 RV_bytes("")
128
129 Pid 2 -> pread! (FD 3) 100 0
130 Tau
131 RV_bytes("")
132
133 Pid 2 -> write! (FD 3) "2" 1
134 Tau
135 RV_num(1)
136
137 read! (FD 3) 100
138 Tau
139 RV_bytes("")
140
141 write! (FD 5) "." 1
142 Tau
143 RV_num(1)
144 pread! (FD 5) 100 0
145 Tau
146 RV_bytes("2.")
147
148 Pid 2 -> pread! (FD 3) 100 0
149 Tau
150 RV_bytes("2.")
151 Pid 2 -> write! (FD 3) "3" 1
152 Tau
153 RV_num(1)
154 Pid 2 -> pread! (FD 3) 100 0
155 Tau
156 RV_bytes("23")
157
158 Pid 2 -> open "f1.txt" [O_APPEND;O_RDWR]
159 Tau
160 RV_num(4)
161
162 Pid 2 -> write! (FD 4) "4" 1
163 Tau
164 RV_num(1)
165 Pid 2 -> pread! (FD 3) 100 0
166 Tau
167 RV_bytes("234")
168
169 truncate "f1.txt" 1
170 Tau
171 RV_none
172
173 Pid 2 -> pread! (FD 3) 100 0
174 Tau
175 RV_bytes("2")
176 Pid 2 -> write! (FD 3) "5" 1
177 Tau
178 RV_num(1)
179 Pid 2 -> write! (FD 4) "6" 1
180 Tau
181 RV_num(1)
182 Pid 2 -> pread! (FD 3) 100 0
183 Tau
184 RV_bytes("2\00056")
185 Pid 2 -> write! (FD 3) "7" 1
186 Tau
187 RV_num(1)
188 Pid 2 -> pread! (FD 4) 100 0
189 Tau
190 RV_bytes("2\00057")
191
192 pread! (FD 3) 100 0
193 Tau
194 RV_bytes("2\00057")
195 write! (FD 5) "!" 1
196 Tau
197 RV_num(1)
198
199 Pid 2 -> pread! (FD 3) 100 0
200 Tau
201 RV_bytes("2\00057!")
202
203 unlink "f1.txt"
204 Tau
205 RV_none
206
207 close (FD 3)
208 Tau
209 RV_none
210
211 pread! (FD 4) 100 0
212 Tau
213 RV_bytes("2\00057!")
214 write! (FD 5) "?" 1
215 Tau
216 RV_num(1)
217
218 Pid 2 -> pread! (FD 3) 100 0
219 Tau
220 RV_bytes("2\00057!?")
221 Pid 2 -> write! (FD 4) "8" 1
222 Tau
223 RV_num(1)
224 Pid 2 -> close (FD 3)
225 Tau
226 RV_none
227 Pid 2 -> pread! (FD 3) 100 0
228 Tau
229 EBADF
230
231 pread! (FD 4) 100 0
232 Tau
233 RV_bytes("2\00057!?8")
234
235
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