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Fix kissattach 'Device or resource busy' #23

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Fix kissattach 'Device or resource busy' #23

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23 changes: 13 additions & 10 deletions kiss.c
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Original file line number Diff line number Diff line change
Expand Up @@ -884,25 +884,28 @@ static int kiss_get (/* MYFDTYPE fd*/ void )
#else /* Linux/Cygwin version */

int n = 0;
fd_set fd_in;
int rc;

while ( n == 0 ) {
/* Reading from master fd of the pty before the client has connected leads to trouble with kissattach. */
/* Use select to check if the slave has sent any data before trying to read from it. */
FD_ZERO(&fd_in);
rc = select(pt_master_fd + 1, &fd_in, NULL, &fd_in, NULL);

n = read(pt_master_fd, &ch, (size_t)1);
if (rc == 0)
{
continue;
}

if (n != 1) {
if (rc == MYFDERROR
|| (n = read(pt_master_fd, &ch, (size_t)1)) != 1)
{

text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError receiving kiss message from client application. Closing %s.\n\n", pt_slave_name);
perror ("");

/* Message added between 1.1 beta test and final version 1.1 */

/* TODO: Determine root cause and find proper solution. */

dw_printf ("This is a known problem that sometimes shows up when using with kissattach.\n");
dw_printf ("There are a couple work-arounds described in the Dire Wolf User Guide\n");
dw_printf ("and the Raspberry Pi APRS documents.\n");

close (pt_master_fd);

pt_master_fd = MYFDERROR;
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