51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
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//
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// This file is part of the µOS++ III distribution.
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// Copyright (c) 2014 Liviu Ionescu.
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//
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// Do not include on semihosting and when freestanding
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#if !defined(OS_USE_SEMIHOSTING) && !(__STDC_HOSTED__ == 0)
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// ----------------------------------------------------------------------------
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#include <errno.h>
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#include "diag/Trace.h"
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// ----------------------------------------------------------------------------
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// When using retargetted configurations, the standard write() system call,
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// after a long way inside newlib, finally calls this implementation function.
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// Based on the file descriptor, it can send arrays of characters to
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// different physical devices.
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// Currently only the output and error file descriptors are tested,
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// and the characters are forwarded to the trace device, mainly
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// for demonstration purposes. Adjust it for your specific needs.
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// For freestanding applications this file is not used and can be safely
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// ignored.
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ssize_t
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_write (int fd, const char* buf, size_t nbyte);
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ssize_t
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_write (int fd __attribute__((unused)), const char* buf __attribute__((unused)),
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size_t nbyte __attribute__((unused)))
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{
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#if defined(TRACE)
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// STDOUT and STDERR are routed to the trace device
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if (fd == 1 || fd == 2)
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{
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return trace_write (buf, nbyte);
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}
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#endif // TRACE
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errno = ENOSYS;
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return -1;
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}
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// ----------------------------------------------------------------------------
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#endif // !defined(OS_USE_SEMIHOSTING) && !(__STDC_HOSTED__ == 0)
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