Last change
on this file since 577 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.1 KB
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1 | /* Reentrant versions of read system call. */ |
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2 | |
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3 | #include <reent.h> |
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4 | #include <unistd.h> |
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5 | #include <_syslist.h> |
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6 | |
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7 | /* Some targets provides their own versions of this functions. Those |
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8 | targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */ |
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9 | |
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10 | #ifdef _REENT_ONLY |
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11 | #ifndef REENTRANT_SYSCALLS_PROVIDED |
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12 | #define REENTRANT_SYSCALLS_PROVIDED |
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13 | #endif |
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14 | #endif |
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15 | |
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16 | #ifndef REENTRANT_SYSCALLS_PROVIDED |
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17 | |
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18 | /* We use the errno variable used by the system dependent layer. */ |
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19 | #undef errno |
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20 | extern int errno; |
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21 | |
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22 | /* |
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23 | FUNCTION |
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24 | <<_read_r>>---Reentrant version of read |
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25 | |
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26 | INDEX |
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27 | _read_r |
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28 | |
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29 | SYNOPSIS |
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30 | #include <reent.h> |
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31 | _ssize_t _read_r(struct _reent *<[ptr]>, |
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32 | int <[fd]>, void *<[buf]>, size_t <[cnt]>); |
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33 | |
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34 | DESCRIPTION |
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35 | This is a reentrant version of <<read>>. It |
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36 | takes a pointer to the global data block, which holds |
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37 | <<errno>>. |
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38 | */ |
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39 | |
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40 | _ssize_t |
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41 | _read_r (struct _reent *ptr, |
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42 | int fd, |
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43 | void *buf, |
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44 | size_t cnt) |
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45 | { |
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46 | _ssize_t ret; |
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47 | |
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48 | errno = 0; |
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49 | if ((ret = (_ssize_t)_read (fd, buf, cnt)) == -1 && errno != 0) |
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50 | ptr->_errno = errno; |
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51 | return ret; |
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52 | } |
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53 | |
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54 | #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */ |
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