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C and C++ Libraries and Floating-Point Support Reference
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The C and C++ libraries
__aeabi_errno_addr()
alloca()
clock()
_clock_init()
__default_signal_handler()
errno
_findlocale()
_fisatty()
_get_lconv()
getenv()
_getenv_init()
__heapstats()
__heapvalid()
lconv structure
localeconv()
_membitcpybl(), _membitcpybb(), _membitcpyhl(), _m
posix_memalign()
#pragma import(_main_redirection)
__raise()
_rand_r()
remove()
rename()
__rt_entry
__rt_errno_addr()
__rt_exit()
__rt_fp_status_addr()
__rt_heap_extend()
__rt_lib_init()
__rt_lib_shutdown()
__rt_raise()
__rt_stackheap_init()
setlocale()
_srand_r()
strcasecmp()
strncasecmp()
strlcat()
strlcpy()
_sys_close()
_sys_command_string()
_sys_ensure()
_sys_exit()
_sys_flen()
_sys_istty()
_sys_open()
_sys_read()
_sys_seek()
_sys_tmpnam()
_sys_write()
system()
time()
_ttywrch()
__user_heap_extend()
__user_heap_extent()
__user_setup_stackheap()
__vectab_stack_and_reset
wcscasecmp()
wcsncasecmp()
wcstombs()
Thread-safe C library functions
C library functions that are not thread-safe
Legacy function __user_initial_stackheap()
Floating-point support
_sys_read()
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| Home > The C and C++ libraries > _sys_read() | |||
Defined in rt_sys.h, this function reads
the contents of a file into a buffer.
Syntaxint _sys_read(FILEHANDLEfh, unsigned char *buf, unsignedlen, intmode);
Note
The mode parameter is here for historical reasons. It contains nothing useful and must be ignored.
The return value is one of the following:
The number of bytes not read (that is,
len-resultnumber of bytes were read).An error indication.
An
EOFindicator. TheEOFindication involves the setting of0x80000000in the normal result.
Reading up to and including the last byte of data does not
turn on the EOF indicator. The EOF indicator
is only reached when an attempt is made to read beyond the last
byte of data. The target-independent code is capable of handling:
the
EOFindicator being returned in the same read as the remaining bytes of data that precede theEOFthe
EOFindicator being returned on its own after the remaining bytes of data have been returned in a previous read.
- Reference
Using ARM C and C++ Libraries and Floating-Point Support:
| Copyright © 2011-2012 ARM. All rights reserved. | ARM DUI 0589B |
| Non-Confidential | ID062912 |
 PDF version | |
| Home > The C and C++ libraries > _sys_read() |
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