diff options
Diffstat (limited to 'gdb/ser-unix.c')
| -rw-r--r-- | gdb/ser-unix.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/gdb/ser-unix.c b/gdb/ser-unix.c index 353657aff07..b9db6c1b243 100644 --- a/gdb/ser-unix.c +++ b/gdb/ser-unix.c @@ -109,6 +109,7 @@ get_tty_state(scb, state) struct hardwire_ttystate *state; { #ifdef HAVE_TERMIOS + extern int errno; pid_t new_process_group; if (tcgetattr(scb->fd, &state->termios) < 0) @@ -117,9 +118,14 @@ get_tty_state(scb, state) if (!job_control) return 0; + /* Apparently, if a tty has no process group, then tcgetpgrp returns -1 with + errno == 0. In this case, set the process group to -1 so that we know to + omit resetting it later. */ new_process_group = tcgetpgrp (scb->fd); - if (new_process_group == (pid_t)-1) + if ((new_process_group == (pid_t)-1) + && (errno != ENOTTY)) return -1; + errno = 0; state->process_group = new_process_group; return 0; #endif @@ -159,7 +165,11 @@ set_tty_state(scb, state) if (!job_control) return 0; - return tcsetpgrp (scb->fd, state->process_group); + /* If the tty had no process group before, then do not reset it. */ + if (state->process_group == -1) + return 0; + else + return tcsetpgrp (scb->fd, state->process_group); #endif #ifdef HAVE_TERMIO @@ -491,8 +501,8 @@ wait_for(scb, timeout) /* Read a character with user-specified timeout. TIMEOUT is number of seconds to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns - char if successful. Returns -2 if timeout expired, EOF if line dropped - dead, or -3 for any other error (see errno in that case). */ + char if successful. Returns SERIAL_TIMEOUT if timeout expired, EOF if line + dropped dead, or SERIAL_ERROR for any other error (see errno in that case). */ static int hardwire_readchar(scb, timeout) |