Mercurial > cpython-lru_cache-weakref

annotate Python/dup2.c @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents f79434ee41fa
children cd73917f2478
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1 /*
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2 * Public domain dup2() lookalike
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3 * by Curtis Jackson @ AT&T Technologies, Burlington, NC
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4 * electronic address: burl!rcj
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5 *
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6 * dup2 performs the following functions:
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7 *
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8 * Check to make sure that fd1 is a valid open file descriptor.
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9 * Check to see if fd2 is already open; if so, close it.
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10 * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd.
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11 * Return fd2 if all went well; return BADEXIT otherwise.
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12 */
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13
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14 #include <fcntl.h>
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15
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16 #define BADEXIT -1
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17
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18 int
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19 dup2(int fd1, int fd2)
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20 {
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21 if (fd1 != fd2) {
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22 if (fcntl(fd1, F_GETFL) < 0)
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23 return BADEXIT;
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24 if (fcntl(fd2, F_GETFL) >= 0)
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25 close(fd2);
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26 if (fcntl(fd1, F_DUPFD, fd2) < 0)
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27 return BADEXIT;
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28 }
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29 return fd2;
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30 }