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| author | K. Richard Pixley <rich@cygnus> | 1993-08-13 21:48:39 +0000 |
|---|---|---|
| committer | K. Richard Pixley <rich@cygnus> | 1993-08-13 21:48:39 +0000 |
| commit | 057c2f477346a2b96f06cff1ae60010f47f05976 (patch) | |
| tree | fb0eadbeca9f54e8ae4cf13836b9352fb9da74ce /gdb/ser-unix.c | |
| parent | 0e5f1b37f69f499d04861e7cd8d276c870289e71 (diff) | |
| download | gdb-057c2f477346a2b96f06cff1ae60010f47f05976.zip gdb-057c2f477346a2b96f06cff1ae60010f47f05976.tar.gz gdb-057c2f477346a2b96f06cff1ae60010f47f05976.tar.bz2 | |
* ser-unix.c (get_tty_state): if a descriptor is not a tty, then
simply save encode this fact as the process group and return
success rather than an error.
(set_tty_state): if process group is -1, do not reset the
process group.
(hardwire_reachar): comment change.
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 353657a..b9db6c1 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) |