diff options
| -rw-r--r-- | ao-tools/lib/cc-usb.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/ao-tools/lib/cc-usb.c b/ao-tools/lib/cc-usb.c index d7ac138c..a3a19d5c 100644 --- a/ao-tools/lib/cc-usb.c +++ b/ao-tools/lib/cc-usb.c @@ -412,19 +412,35 @@ cc_usb_close_remote(struct cc_usb *cc) static struct termios save_termios; +#include <errno.h> + struct cc_usb * cc_usb_open(char *tty) { struct cc_usb *cc; struct termios termios; + int i; if (!tty) tty = DEFAULT_TTY; cc = calloc (sizeof (struct cc_usb), 1); if (!cc) return NULL; - cc->fd = open(tty, O_RDWR | O_NONBLOCK); - if (cc->fd < 0) { + i = 0; + for (;;) { + cc->fd = open(tty, O_RDWR | O_NONBLOCK); + if (cc->fd >= 0) + break; + i++; + if (errno == EBUSY || errno == EPERM || errno == EACCES) { + fprintf(stderr, "open failed, pausing"); + perror(tty); + if (i < 20) { + sleep(3); + continue; + } + } + perror(tty); free (cc); return NULL; |