diff options
Diffstat (limited to '')
| -rw-r--r-- | drv_generic_serial.c | 35 |
1 files changed, 22 insertions, 13 deletions
diff --git a/drv_generic_serial.c b/drv_generic_serial.c index 4644903..b34d117 100644 --- a/drv_generic_serial.c +++ b/drv_generic_serial.c @@ -1,4 +1,4 @@ -/* $Id: drv_generic_serial.c,v 1.17 2005/05/08 04:32:44 reinelt Exp $ +/* $Id: drv_generic_serial.c,v 1.18 2006/09/08 19:00:46 reinelt Exp $ * * generic driver helper for serial and usbserial displays * @@ -23,6 +23,9 @@ * * * $Log: drv_generic_serial.c,v $ + * Revision 1.18 2006/09/08 19:00:46 reinelt + * give up after 10 write errors to serial device + * * Revision 1.17 2005/05/08 04:32:44 reinelt * CodingStyle added and applied * @@ -153,6 +156,8 @@ #include "drv_generic_serial.h" +extern int got_signal; + static char *Section; static char *Driver; static char *Port; @@ -412,33 +417,37 @@ int drv_generic_serial_read(char *string, const int len) void drv_generic_serial_write(const char *string, const int len) { + static int error = 0; int run, ret; -#if 0 - int i; - for (i = 0; i < len; i++) { - int c = string[i]; - debug("serial_write: %03d %03o 0x%02x %c", c, c, c, iscntrl(c) ? '*' : c); - } -#endif - - if (Device == -1) + if (Device == -1) { + error("%s: write to closed port %s failed!", Driver, Port); return; + } + for (run = 0; run < 10; run++) { ret = write(Device, string, len); - if (ret >= 0 || errno != EAGAIN) + if (ret >= 0 || errno != EAGAIN) { break; - if (run > 0) + } + /* EAGAIN: retry 10 times, emit message after 2nd retry */ + if (run > 0) { info("%s: write(%s): EAGAIN #%d", Driver, Port, run); + } usleep(1000); } if (ret < 0) { error("%s: write(%s) failed: %s", Driver, Port, strerror(errno)); + if (++error > 10) { + error("%s: too much errors, giving up", Driver); + got_signal = -1; + } } else if (ret != len) { error("%s: partial write(%s): len=%d ret=%d", Driver, Port, len, ret); + } else { + error = 0; } - return; } |