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tty: Support SIGTTOU, SIGTTIN behavior

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This commit is contained in:
K. Lange 2024-01-19 20:15:05 +09:00
parent b23c2b1a9e
commit d3926009b6
1 changed files with 28 additions and 0 deletions
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28
kernel/vfs/tty.c
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@ -382,9 +382,24 @@ void close_pty_master(fs_node_t * node) {
return;
}
static int ignoring(int sig) {
if (this_core->current_process->blocked_signals & (1ULL << sig)) return 1;
if (this_core->current_process->signals[sig].handler == 1) return 1;
return 0;
}
ssize_t read_pty_slave(fs_node_t * node, off_t offset, size_t size, uint8_t *buffer) {
pty_t * pty = (pty_t *)node->device;
/* If this process *is* part of this tty's session, but is NOT in the foreground job
* and it tries to read from the TTY, then send it SIGTTIN - but only if it's not
* ignoring it. If it is ignoring, make the write fail with EIO. */
if (pty->ct_proc == this_core->current_process->session && pty->fg_proc && this_core->current_process->job != pty->fg_proc) {
if (ignoring(SIGTTIN)) return -EIO;
group_send_signal(this_core->current_process->job, SIGTTIN, 1);
return -ERESTARTSYS;
}
if (pty->tios.c_lflag & ICANON) {
return ring_buffer_read(pty->in, size, buffer);
} else {
@ -406,6 +421,19 @@ ssize_t read_pty_slave(fs_node_t * node, off_t offset, size_t size, uint8_t *buf
ssize_t write_pty_slave(fs_node_t * node, off_t offset, size_t size, uint8_t *buffer) {
pty_t * pty = (pty_t *)node->device;
if (pty->tios.c_lflag & TOSTOP) {
/* If TOSTOP is enabled and this process *is* part of this tty's session but
* is NOT in the foreground job, then send the whole job SIGTTOU - but only
* if we weren't ignoring SIGTTOU ourselves. If we were ignoring it, then
* the write can continue without issue. */
if (pty->ct_proc == this_core->current_process->session && pty->fg_proc && this_core->current_process->job != pty->fg_proc) {
if (!ignoring(SIGTTOU)) {
group_send_signal(this_core->current_process->job, SIGTTOU, 1);
return -ERESTARTSYS;
}
}
}
size_t l = 0;
for (uint8_t * c = buffer; l < size; ++c, ++l) {
output_process_slave(pty, *c);