37 lines
1.1 KiB
Diff
37 lines
1.1 KiB
Diff
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From 238bbe98558bcd5ed9ab73ef03db82b57ab056ab Mon Sep 17 00:00:00 2001
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From: Giulio Benetti <giulio.benetti@micronovasrl.com>
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Date: Fri, 31 Aug 2018 15:18:22 +0200
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Subject: [PATCH] sysdep1: check if RS485 is support before setting its
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parameters
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Not every kernel supports RS485, so better check it before setting its
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parameters.
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Test if RS485 is supported by checking if these 3 macros are defined:
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- SER_RS485_ENABLED
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- TIOCGRS485
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- TIOCSRS485
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If they're not defined m_set485parms becomes a dummy function.
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Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
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---
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src/sysdep1.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/sysdep1.c b/src/sysdep1.c
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index 798b006..b03b442 100644
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--- a/src/sysdep1.c
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+++ b/src/sysdep1.c
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@@ -599,7 +599,7 @@ void m_set485parms(int fd, int en, int rts_on_snd, int rts_aft_snd,
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int rx_dur_tx, int term_bus, char *del_rts_bef_snd,
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char *del_rts_aft_snd)
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{
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-#ifdef SER_RS485_ENABLED
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+#if defined (SER_RS485_ENABLED) && defined (TIOCGRS485) && defined (TIOCSRS485)
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struct serial_rs485 rs485conf;
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if (ioctl(fd, TIOCGRS485, &rs485conf))
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--
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2.17.1
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