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closes bpo-32859: Don't retry dup3() if it is not available at runtime (GH-5708)
os.dup2() tests for dup3() system call availability at runtime, but doesn't remember the result across calls, repeating the test on each call with inheritable=False. Since the caller of os.dup2() is expected to hold the GIL, fix this by making the variable holding the test result static.
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2 changed files with 3 additions and 1 deletions
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@ -8016,7 +8016,7 @@ os_dup2_impl(PyObject *module, int fd, int fd2, int inheritable)
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#if defined(HAVE_DUP3) && \
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!(defined(HAVE_FCNTL_H) && defined(F_DUP2FD_CLOEXEC))
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/* dup3() is available on Linux 2.6.27+ and glibc 2.9 */
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int dup3_works = -1;
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static int dup3_works = -1;
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#endif
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if (fd < 0 || fd2 < 0) {
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