Last change
on this file since 413 was 398, checked in by coas-nagasima, 5 years ago |
mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
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Property svn:eol-style
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File size:
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1 | #include "stdio_impl.h"
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2 | #include <fcntl.h>
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3 |
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4 | /* The basic idea of this implementation is to open a new FILE,
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5 | * hack the necessary parts of the new FILE into the old one, then
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6 | * close the new FILE. */
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7 |
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8 | /* Locking IS necessary because another thread may provably hold the
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9 | * lock, via flockfile or otherwise, when freopen is called, and in that
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10 | * case, freopen cannot act until the lock is released. */
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11 |
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12 | int __dup3(int, int, int);
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13 |
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14 | FILE *freopen(const char *restrict filename, const char *restrict mode, FILE *restrict f)
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15 | {
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16 | int fl = __fmodeflags(mode);
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17 | FILE *f2;
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18 |
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19 | FLOCK(f);
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20 |
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21 | fflush(f);
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22 |
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23 | if (!filename) {
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24 | if (fl&O_CLOEXEC)
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25 | __syscall(SYS_fcntl, f->fd, F_SETFD, FD_CLOEXEC);
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26 | fl &= ~(O_CREAT|O_EXCL|O_CLOEXEC);
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27 | if (syscall(SYS_fcntl, f->fd, F_SETFL, fl) < 0)
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28 | goto fail;
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29 | } else {
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30 | f2 = fopen(filename, mode);
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31 | if (!f2) goto fail;
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32 | if (f2->fd == f->fd) f2->fd = -1; /* avoid closing in fclose */
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33 | else if (__dup3(f2->fd, f->fd, fl&O_CLOEXEC)<0) goto fail2;
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34 |
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35 | f->flags = (f->flags & F_PERM) | f2->flags;
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36 | f->read = f2->read;
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37 | f->write = f2->write;
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38 | f->seek = f2->seek;
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39 | f->close = f2->close;
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40 |
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41 | fclose(f2);
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42 | }
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43 |
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44 | FUNLOCK(f);
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45 | return f;
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46 |
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47 | fail2:
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48 | fclose(f2);
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49 | fail:
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50 | fclose(f);
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51 | return NULL;
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52 | }
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53 |
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54 | LFS64(freopen);
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