| 1 | #!/usr/bin/env python2
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| 2 | """
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| 3 | posix_test.py: Tests for our posix_ module subset.
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| 4 |
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| 5 | NOTE: There are more tests in Python-2.7.13/Lib/test/test_posix.py.
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| 6 |
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| 7 | Notes on stripping posixmodule.c:
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| 8 |
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| 9 | I left in:
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| 10 |
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| 11 | - putenv, unsetenv: Isn't it simpler to use these than os.environ? I'm not
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| 12 | sure how it works.
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| 13 | - tcgetpgrp, tcsetpgrp, setsid, getsid: is this for job control?
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| 14 |
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| 15 | - times: This is a builtin! It's like 'time' for the shell prosecs itself.
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| 16 | - symlink - useful for writing tools?
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| 17 | - waitpid - because we're using wait
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| 18 |
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| 19 | - set*uid, etc. - for container tools?
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| 20 | - kill, killpg - would the kill builtin need these?
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| 21 | - getppid - I think for $PPID
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| 22 |
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| 23 | - mkdir, rmdir() -- might be useful for tools
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| 24 |
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| 25 | Other notes:
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| 26 |
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| 27 | - The shell uses dup2 but not dup?
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| 28 | """
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| 29 | from __future__ import print_function
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| 30 |
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| 31 | import signal
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| 32 | import subprocess
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| 33 | import unittest
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| 34 |
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| 35 | import posix_ # module under test
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| 36 | from mycpp.mylib import log
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| 37 |
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| 38 |
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| 39 | # Taken from build/oil-defs/.../posix_methods.def
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| 40 |
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| 41 | FUNCS = [
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| 42 | "access",
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| 43 | "chdir",
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| 44 | "getcwd",
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| 45 | "listdir",
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| 46 | "lstat",
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| 47 | "readlink",
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| 48 | "stat",
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| 49 | "umask",
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| 50 | "uname",
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| 51 | "_exit",
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| 52 | "execv",
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| 53 | "execve",
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| 54 | "fork",
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| 55 | "geteuid",
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| 56 | "getpid",
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| 57 | "getuid",
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| 58 | "wait",
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| 59 | "open",
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| 60 | "close",
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| 61 | "dup2",
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| 62 | "read",
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| 63 | "write",
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| 64 | "fdopen",
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| 65 | "isatty",
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| 66 | "pipe",
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| 67 | "strerror",
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| 68 | "WIFSIGNALED",
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| 69 | "WIFEXITED",
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| 70 | "WEXITSTATUS",
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| 71 | "WTERMSIG",
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| 72 |
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| 73 | # Additional names found by grepping
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| 74 | 'X_OK',
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| 75 | 'R_OK',
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| 76 | 'W_OK',
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| 77 |
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| 78 | 'O_APPEND',
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| 79 | 'O_CREAT',
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| 80 | 'O_RDONLY',
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| 81 | 'O_RDWR',
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| 82 | 'O_TRUNC',
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| 83 | 'O_WRONLY',
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| 84 | ]
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| 85 |
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| 86 | class PosixTest(unittest.TestCase):
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| 87 |
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| 88 | def testFoo(self):
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| 89 | print(posix_.getcwd())
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| 90 | # Testing this because I removed a lot of #ifdef
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| 91 | entries = posix_.listdir('.')
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| 92 | self.assert_('doc' in entries)
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| 93 |
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| 94 | def testFunctionsExist(self):
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| 95 | for name in FUNCS:
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| 96 | func = getattr(posix_, name)
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| 97 | print(func)
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| 98 |
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| 99 | def testEmptyReadAndWrite(self):
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| 100 | # Regression for bug where this would hang
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| 101 | posix_.read(0, 0)
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| 102 | posix_.write(1, '')
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| 103 |
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| 104 | def testRead(self):
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| 105 | if posix_.environ.get('EINTR_TEST'):
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| 106 | # Now we can do kill -TERM PID can get EINTR.
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| 107 | # Or Ctrl-C for KeyboardInterrupt
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| 108 |
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| 109 | signal.signal(signal.SIGTERM, _Handler)
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| 110 | log('Hanging on read in pid %d', posix_.getpid())
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| 111 | posix_.read(0, 1)
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| 112 |
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| 113 | def testWait(self):
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| 114 | if posix_.environ.get('EINTR_TEST'):
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| 115 | # Now we can do kill -TERM PID can get EINTR.
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| 116 | signal.signal(signal.SIGTERM, _Handler)
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| 117 |
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| 118 | p = subprocess.Popen(['sleep', '5'])
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| 119 | log('started sleep pid %d', p.pid)
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| 120 |
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| 121 | log('Hanging on wait in pid %d', posix_.getpid())
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| 122 | posix_.wait()
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| 123 |
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| 124 | def testWaitpid(self):
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| 125 | if posix_.environ.get('EINTR_TEST'):
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| 126 | # Now we can do kill -TERM PID can get EINTR.
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| 127 | signal.signal(signal.SIGTERM, _Handler)
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| 128 |
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| 129 | p = subprocess.Popen(['sleep', '5'])
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| 130 | log('started sleep pid %d', p.pid)
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| 131 |
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| 132 | log('Hanging on waitpid in pid %d', posix_.getpid())
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| 133 | posix_.waitpid(-1, 0)
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| 134 |
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| 135 | def testWrite(self):
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| 136 | if posix_.environ.get('EINTR_TEST'):
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| 137 |
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| 138 | signal.signal(signal.SIGTERM, _Handler)
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| 139 | r, w = posix_.pipe()
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| 140 | log('Hanging on write in pid %d', posix_.getpid())
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| 141 |
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| 142 | # 1 byte bigger than pipe size
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| 143 | n = posix_.write(w, 'x'*65537)
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| 144 | log('1: Wrote %d bytes', n)
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| 145 |
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| 146 | # write returns early when a signal interrupts it, and we read at least
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| 147 | # one byte! We do NOT get EINTR>
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| 148 |
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| 149 | # On the second try, it didn't write anything, and we get EINTR!
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| 150 |
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| 151 | log('Second try (pid %d)', posix_.getpid())
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| 152 | n = posix_.write(w, 'x'*65537)
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| 153 | log('2: Wrote %d bytes', n)
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| 154 |
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| 155 | def testPrint(self):
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| 156 | # Conclusion: print CAN raise IOError with EINTR.
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| 157 |
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| 158 | if posix_.environ.get('EINTR_TEST'):
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| 159 |
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| 160 | signal.signal(signal.SIGTERM, _Handler)
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| 161 | r, w = posix_.pipe()
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| 162 | log('Hanging on write in pid %d', posix_.getpid())
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| 163 | f = posix_.fdopen(w, 'w')
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| 164 |
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| 165 | # 1 byte bigger than pipe size
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| 166 | print('x'*65537, file=f)
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| 167 | log('1: done')
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| 168 |
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| 169 | # write returns early when a signal interrupts it, and we read at least
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| 170 | # one byte! We do NOT get EINTR>
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| 171 |
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| 172 | # On the second try, it didn't write anything, and we get EINTR!
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| 173 |
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| 174 | log('Second try (pid %d)', posix_.getpid())
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| 175 | print('x'*65537, file=f)
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| 176 | log('2: done')
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| 177 |
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| 178 |
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| 179 | def _Handler(x, y):
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| 180 | log('Got signal %s %s', x, y)
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| 181 |
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| 182 |
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| 183 | if __name__ == '__main__':
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| 184 | unittest.main()
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