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Add signal handlers and background processes

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This commit is contained in:
Hugo Mårdbrink 2025-08-02 00:10:31 +02:00
parent 3e2b956786
commit 5a77cc3bdf
2 changed files with 47 additions and 3 deletions
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49
shell/shell.odin
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@ -1,5 +1,7 @@
package shell
import "base:runtime"
import "core:fmt"
import "core:strings"
import "core:sys/posix"
@ -14,6 +16,45 @@ ShellState :: enum {
Stop
}
maybe_foreground_pid: Maybe(posix.pid_t) = nil
ctx: runtime.Context
handle_ctrl_c :: proc"c"(sig: posix.Signal) {
foreground_pid, foreground_running := maybe_foreground_pid.?
if foreground_running {
posix.kill(foreground_pid, .SIGINT)
} else {
// Clear prompt
}
}
handle_backround_process :: proc"c"(sig: posix.Signal) {
context = ctx
foreground_pid, foreground_running := maybe_foreground_pid.?
if foreground_running do return
CHILD_PROCESS :: -1
background_pid := posix.waitpid(CHILD_PROCESS, nil, {.NOHANG})
if background_pid > 0 && background_pid != foreground_pid {
fmt.printf("skal: [%d] done", background_pid)
// Clear prompt
}
if foreground_pid == background_pid {
maybe_foreground_pid = nil
}
}
init_shell :: proc() {
ctx = context
posix.signal(.SIGINT, handle_ctrl_c)
posix.signal(.SIGCHLD, handle_backround_process)
}
get_prompt :: proc() -> string {
dir := os.get_current_directory(context.temp_allocator)
home := string(posix.getenv("HOME"))
@ -32,8 +73,8 @@ get_prompt :: proc() -> string {
user = string(pw.pw_name)
}
promt_parts := []string {user, " :: ", dir, " » "}
prompt, err := strings.concatenate(promt_parts[:], context.temp_allocator)
prompt_parts := []string {user, " :: ", dir, " » "}
prompt, err := strings.concatenate(prompt_parts[:], context.temp_allocator)
log.assertf(err == nil, "Memory allocation failed")
return prompt
@ -161,9 +202,11 @@ execute_cmd_seq :: proc(cmd_seq: ^parser.CommandSequence) {
pipe_command(&pipe_seq, nil, len(pipe_seq.commands)-1)
case: // Parent
if pipe_seq.is_background {
fmt.printf("Background process: [%d]\n", pid)
fmt.printf("skal: [%d] spawned\n", pid)
posix.waitpid(pid, nil, { .NOHANG})
} else {
maybe_foreground_pid = pid
status: i32
posix.waitpid(pid, &status, { .UNTRACED, .CONTINUED })