github.com/alexis81/domosgo@v0.0.0-20191016125037-5aee90a434af/Domos/src/golang.org/x/sys/unix/syscall_linux_test.go (about) 1 // Copyright 2016 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build linux 6 7 package unix_test 8 9 import ( 10 "os" 11 "runtime" 12 "runtime/debug" 13 "testing" 14 "time" 15 16 "golang.org/x/sys/unix" 17 ) 18 19 func TestIoctlGetInt(t *testing.T) { 20 f, err := os.Open("/dev/random") 21 if err != nil { 22 t.Fatalf("failed to open device: %v", err) 23 } 24 defer f.Close() 25 26 v, err := unix.IoctlGetInt(int(f.Fd()), unix.RNDGETENTCNT) 27 if err != nil { 28 t.Fatalf("failed to perform ioctl: %v", err) 29 } 30 31 t.Logf("%d bits of entropy available", v) 32 } 33 34 func TestPpoll(t *testing.T) { 35 f, cleanup := mktmpfifo(t) 36 defer cleanup() 37 38 const timeout = 100 * time.Millisecond 39 40 ok := make(chan bool, 1) 41 go func() { 42 select { 43 case <-time.After(10 * timeout): 44 t.Errorf("Ppoll: failed to timeout after %d", 10*timeout) 45 case <-ok: 46 } 47 }() 48 49 fds := []unix.PollFd{{Fd: int32(f.Fd()), Events: unix.POLLIN}} 50 timeoutTs := unix.NsecToTimespec(int64(timeout)) 51 n, err := unix.Ppoll(fds, &timeoutTs, nil) 52 ok <- true 53 if err != nil { 54 t.Errorf("Ppoll: unexpected error: %v", err) 55 return 56 } 57 if n != 0 { 58 t.Errorf("Ppoll: wrong number of events: got %v, expected %v", n, 0) 59 return 60 } 61 } 62 63 func TestTime(t *testing.T) { 64 var ut unix.Time_t 65 ut2, err := unix.Time(&ut) 66 if err != nil { 67 t.Fatalf("Time: %v", err) 68 } 69 if ut != ut2 { 70 t.Errorf("Time: return value %v should be equal to argument %v", ut2, ut) 71 } 72 73 var now time.Time 74 75 for i := 0; i < 10; i++ { 76 ut, err = unix.Time(nil) 77 if err != nil { 78 t.Fatalf("Time: %v", err) 79 } 80 81 now = time.Now() 82 83 if int64(ut) == now.Unix() { 84 return 85 } 86 } 87 88 t.Errorf("Time: return value %v should be nearly equal to time.Now().Unix() %v", ut, now.Unix()) 89 } 90 91 func TestUtime(t *testing.T) { 92 defer chtmpdir(t)() 93 94 touch(t, "file1") 95 96 buf := &unix.Utimbuf{ 97 Modtime: 12345, 98 } 99 100 err := unix.Utime("file1", buf) 101 if err != nil { 102 t.Fatalf("Utime: %v", err) 103 } 104 105 fi, err := os.Stat("file1") 106 if err != nil { 107 t.Fatal(err) 108 } 109 110 if fi.ModTime().Unix() != 12345 { 111 t.Errorf("Utime: failed to change modtime: expected %v, got %v", 12345, fi.ModTime().Unix()) 112 } 113 } 114 115 func TestUtimesNanoAt(t *testing.T) { 116 defer chtmpdir(t)() 117 118 symlink := "symlink1" 119 os.Remove(symlink) 120 err := os.Symlink("nonexisting", symlink) 121 if err != nil { 122 t.Fatal(err) 123 } 124 125 ts := []unix.Timespec{ 126 {Sec: 1111, Nsec: 2222}, 127 {Sec: 3333, Nsec: 4444}, 128 } 129 err = unix.UtimesNanoAt(unix.AT_FDCWD, symlink, ts, unix.AT_SYMLINK_NOFOLLOW) 130 if err != nil { 131 t.Fatalf("UtimesNanoAt: %v", err) 132 } 133 134 var st unix.Stat_t 135 err = unix.Lstat(symlink, &st) 136 if err != nil { 137 t.Fatalf("Lstat: %v", err) 138 } 139 if st.Atim != ts[0] { 140 t.Errorf("UtimesNanoAt: wrong atime: %v", st.Atim) 141 } 142 if st.Mtim != ts[1] { 143 t.Errorf("UtimesNanoAt: wrong mtime: %v", st.Mtim) 144 } 145 } 146 147 func TestRlimitAs(t *testing.T) { 148 // disable GC during to avoid flaky test 149 defer debug.SetGCPercent(debug.SetGCPercent(-1)) 150 151 var rlim unix.Rlimit 152 err := unix.Getrlimit(unix.RLIMIT_AS, &rlim) 153 if err != nil { 154 t.Fatalf("Getrlimit: %v", err) 155 } 156 var zero unix.Rlimit 157 if zero == rlim { 158 t.Fatalf("Getrlimit: got zero value %#v", rlim) 159 } 160 set := rlim 161 set.Cur = uint64(unix.Getpagesize()) 162 err = unix.Setrlimit(unix.RLIMIT_AS, &set) 163 if err != nil { 164 t.Fatalf("Setrlimit: set failed: %#v %v", set, err) 165 } 166 167 // RLIMIT_AS was set to the page size, so mmap()'ing twice the page size 168 // should fail. See 'man 2 getrlimit'. 169 _, err = unix.Mmap(-1, 0, 2*unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE) 170 if err == nil { 171 t.Fatal("Mmap: unexpectedly suceeded after setting RLIMIT_AS") 172 } 173 174 err = unix.Setrlimit(unix.RLIMIT_AS, &rlim) 175 if err != nil { 176 t.Fatalf("Setrlimit: restore failed: %#v %v", rlim, err) 177 } 178 179 b, err := unix.Mmap(-1, 0, 2*unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE) 180 if err != nil { 181 t.Fatalf("Mmap: %v", err) 182 } 183 err = unix.Munmap(b) 184 if err != nil { 185 t.Fatalf("Munmap: %v", err) 186 } 187 } 188 189 func TestSelect(t *testing.T) { 190 _, err := unix.Select(0, nil, nil, nil, &unix.Timeval{Sec: 0, Usec: 0}) 191 if err != nil { 192 t.Fatalf("Select: %v", err) 193 } 194 195 dur := 150 * time.Millisecond 196 tv := unix.NsecToTimeval(int64(dur)) 197 start := time.Now() 198 _, err = unix.Select(0, nil, nil, nil, &tv) 199 took := time.Since(start) 200 if err != nil { 201 t.Fatalf("Select: %v", err) 202 } 203 204 if took < dur { 205 t.Errorf("Select: timeout should have been at least %v, got %v", dur, took) 206 } 207 } 208 209 func TestPselect(t *testing.T) { 210 _, err := unix.Pselect(0, nil, nil, nil, &unix.Timespec{Sec: 0, Nsec: 0}, nil) 211 if err != nil { 212 t.Fatalf("Pselect: %v", err) 213 } 214 215 dur := 2500 * time.Microsecond 216 ts := unix.NsecToTimespec(int64(dur)) 217 start := time.Now() 218 _, err = unix.Pselect(0, nil, nil, nil, &ts, nil) 219 took := time.Since(start) 220 if err != nil { 221 t.Fatalf("Pselect: %v", err) 222 } 223 224 if took < dur { 225 t.Errorf("Pselect: timeout should have been at least %v, got %v", dur, took) 226 } 227 } 228 229 func TestSchedSetaffinity(t *testing.T) { 230 runtime.LockOSThread() 231 defer runtime.UnlockOSThread() 232 233 var oldMask unix.CPUSet 234 err := unix.SchedGetaffinity(0, &oldMask) 235 if err != nil { 236 t.Fatalf("SchedGetaffinity: %v", err) 237 } 238 239 var newMask unix.CPUSet 240 newMask.Zero() 241 if newMask.Count() != 0 { 242 t.Errorf("CpuZero: didn't zero CPU set: %v", newMask) 243 } 244 cpu := 1 245 newMask.Set(cpu) 246 if newMask.Count() != 1 || !newMask.IsSet(cpu) { 247 t.Errorf("CpuSet: didn't set CPU %d in set: %v", cpu, newMask) 248 } 249 cpu = 5 250 newMask.Set(cpu) 251 if newMask.Count() != 2 || !newMask.IsSet(cpu) { 252 t.Errorf("CpuSet: didn't set CPU %d in set: %v", cpu, newMask) 253 } 254 newMask.Clear(cpu) 255 if newMask.Count() != 1 || newMask.IsSet(cpu) { 256 t.Errorf("CpuClr: didn't clear CPU %d in set: %v", cpu, newMask) 257 } 258 259 if runtime.NumCPU() < 2 { 260 t.Skip("skipping setaffinity tests on single CPU system") 261 } 262 263 err = unix.SchedSetaffinity(0, &newMask) 264 if err != nil { 265 t.Fatalf("SchedSetaffinity: %v", err) 266 } 267 268 var gotMask unix.CPUSet 269 err = unix.SchedGetaffinity(0, &gotMask) 270 if err != nil { 271 t.Fatalf("SchedGetaffinity: %v", err) 272 } 273 274 if gotMask != newMask { 275 t.Errorf("SchedSetaffinity: returned affinity mask does not match set affinity mask") 276 } 277 278 // Restore old mask so it doesn't affect successive tests 279 err = unix.SchedSetaffinity(0, &oldMask) 280 if err != nil { 281 t.Fatalf("SchedSetaffinity: %v", err) 282 } 283 } 284 285 func TestStatx(t *testing.T) { 286 var stx unix.Statx_t 287 err := unix.Statx(unix.AT_FDCWD, ".", 0, 0, &stx) 288 if err == unix.ENOSYS { 289 t.Skip("statx syscall is not available, skipping test") 290 } else if err != nil { 291 t.Fatalf("Statx: %v", err) 292 } 293 294 defer chtmpdir(t)() 295 touch(t, "file1") 296 297 var st unix.Stat_t 298 err = unix.Stat("file1", &st) 299 if err != nil { 300 t.Fatalf("Stat: %v", err) 301 } 302 303 flags := unix.AT_STATX_SYNC_AS_STAT 304 err = unix.Statx(unix.AT_FDCWD, "file1", flags, unix.STATX_ALL, &stx) 305 if err != nil { 306 t.Fatalf("Statx: %v", err) 307 } 308 309 if uint32(stx.Mode) != st.Mode { 310 t.Errorf("Statx: returned stat mode does not match Stat") 311 } 312 313 atime := unix.StatxTimestamp{Sec: int64(st.Atim.Sec), Nsec: uint32(st.Atim.Nsec)} 314 ctime := unix.StatxTimestamp{Sec: int64(st.Ctim.Sec), Nsec: uint32(st.Ctim.Nsec)} 315 mtime := unix.StatxTimestamp{Sec: int64(st.Mtim.Sec), Nsec: uint32(st.Mtim.Nsec)} 316 317 if stx.Atime != atime { 318 t.Errorf("Statx: returned stat atime does not match Stat") 319 } 320 if stx.Ctime != ctime { 321 t.Errorf("Statx: returned stat ctime does not match Stat") 322 } 323 if stx.Mtime != mtime { 324 t.Errorf("Statx: returned stat mtime does not match Stat") 325 } 326 327 err = os.Symlink("file1", "symlink1") 328 if err != nil { 329 t.Fatal(err) 330 } 331 332 err = unix.Lstat("symlink1", &st) 333 if err != nil { 334 t.Fatalf("Lstat: %v", err) 335 } 336 337 err = unix.Statx(unix.AT_FDCWD, "symlink1", flags, unix.STATX_BASIC_STATS, &stx) 338 if err != nil { 339 t.Fatalf("Statx: %v", err) 340 } 341 342 // follow symlink, expect a regulat file 343 if stx.Mode&unix.S_IFREG == 0 { 344 t.Errorf("Statx: didn't follow symlink") 345 } 346 347 err = unix.Statx(unix.AT_FDCWD, "symlink1", flags|unix.AT_SYMLINK_NOFOLLOW, unix.STATX_ALL, &stx) 348 if err != nil { 349 t.Fatalf("Statx: %v", err) 350 } 351 352 // follow symlink, expect a symlink 353 if stx.Mode&unix.S_IFLNK == 0 { 354 t.Errorf("Statx: unexpectedly followed symlink") 355 } 356 if uint32(stx.Mode) != st.Mode { 357 t.Errorf("Statx: returned stat mode does not match Lstat") 358 } 359 360 atime = unix.StatxTimestamp{Sec: int64(st.Atim.Sec), Nsec: uint32(st.Atim.Nsec)} 361 ctime = unix.StatxTimestamp{Sec: int64(st.Ctim.Sec), Nsec: uint32(st.Ctim.Nsec)} 362 mtime = unix.StatxTimestamp{Sec: int64(st.Mtim.Sec), Nsec: uint32(st.Mtim.Nsec)} 363 364 if stx.Atime != atime { 365 t.Errorf("Statx: returned stat atime does not match Lstat") 366 } 367 if stx.Ctime != ctime { 368 t.Errorf("Statx: returned stat ctime does not match Lstat") 369 } 370 if stx.Mtime != mtime { 371 t.Errorf("Statx: returned stat mtime does not match Lstat") 372 } 373 }