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Staging
v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision dab8423d220243efabbbcafafc12d90145539b50 authored by Victor Stinner on 17 March 2020, 17:56:44 UTC, committed by GitHub on 17 March 2020, 17:56:44 UTC 
bpo-39984: Add PyInterpreterState.ceval (GH-19047)
 
subinterpreters: Move _PyRuntimeState.ceval.tracing_possible to
PyInterpreterState.ceval.tracing_possible: each interpreter now has
its own variable.

Changes:

* Add _ceval_state structure.
* Add PyInterpreterState.ceval field.
* _PyEval_EvalFrameDefault(): add ceval2 variable (struct _ceval_state*).
* Rename _PyEval_Initialize() to _PyEval_InitRuntimeState().
* Add _PyEval_InitState().
* Don't export internal _Py_FinishPendingCalls() and
  _PyEval_FiniThreads() functions anymore.
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Tip revision: dab8423d220243efabbbcafafc12d90145539b50 authored by Victor Stinner on 17 March 2020, 17:56:44 UTC
bpo-39984: Add PyInterpreterState.ceval (GH-19047)
Tip revision: dab8423
dup2.c 
/*
 * Public domain dup2() lookalike
 * by Curtis Jackson @ AT&T Technologies, Burlington, NC
 * electronic address:  burl!rcj
 *
 * dup2 performs the following functions:
 *
 * Check to make sure that fd1 is a valid open file descriptor.
 * Check to see if fd2 is already open; if so, close it.
 * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd.
 * Return fd2 if all went well; return BADEXIT otherwise.
 */

#include <fcntl.h>
#include <unistd.h>

#define BADEXIT -1

int
dup2(int fd1, int fd2)
{
    if (fd1 != fd2) {
        if (fcntl(fd1, F_GETFL) < 0)
            return BADEXIT;
        if (fcntl(fd2, F_GETFL) >= 0)
            close(fd2);
        if (fcntl(fd1, F_DUPFD, fd2) < 0)
            return BADEXIT;
    }
    return fd2;
}
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