Last change
on this file 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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Rev | Line | |
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[444] | 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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