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termio: clean up error handling for kill

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This commit is contained in:
Mitchell Hashimoto
2022-11-06 15:26:18 -08:00
parent c9b01fdc6c
commit 705772ed28
1 changed files with 27 additions and 5 deletions
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30
src/termio/Exec.zig
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@ -16,6 +16,7 @@ const renderer = @import("../renderer.zig");
const log = std.log.scoped(.io_exec);
const c = @cImport({
@cInclude("errno.h");
@cInclude("signal.h");
@cInclude("unistd.h");
});
@ -119,7 +120,8 @@ pub fn init(alloc: Allocator, opts: termio.Options) !Exec {
pub fn deinit(self: *Exec) void {
// Kill our command
self.killCommand();
self.killCommand() catch |err|
log.err("error sending SIGHUP to command, may hang: {}", .{err});
_ = self.command.wait() catch |err|
log.err("error waiting for command to exit: {}", .{err});
@ -130,15 +132,35 @@ pub fn deinit(self: *Exec) void {
/// Kill the underlying subprocess. This closes the pty file handle and
/// sends a SIGHUP to the child process. This doesn't wait for the child
/// process to be exited.
fn killCommand(self: *Exec) void {
fn killCommand(self: *Exec) !void {
// Close our PTY
self.pty.deinit();
// We need to get our process group ID and send a SIGHUP to it.
if (self.command.pid) |pid| {
const pgid_: ?c.pid_t = pgid: {
const pgid = c.getpgid(pid);
if (pgid > 0) {
_ = c.killpg(pgid, c.SIGHUP);
// Don't know why it would be zero but its not a valid pid
if (pgid == 0) break :pgid null;
// If the pid doesn't exist then... okay.
if (pgid == c.ESRCH) break :pgid null;
// If we have an error...
if (pgid < 0) {
log.warn("error getting pgid for kill", .{});
break :pgid null;
}
break :pgid pgid;
};
if (pgid_) |pgid| {
if (c.killpg(pgid, c.SIGHUP) < 0) {
log.warn("error killing process group pgid={}", .{pgid});
return error.KillFailed;
}
}
}
}