mirror of
https://github.com/troglobit/finit.git
synced 2026-10-02 05:52:48 +07:00
Joachim Wiberg
0a269f3298
Finit had no way to answer the question every service manager gets asked: what is running, and change it. D-Bus is how the rest of userspace asks, but linking libdbus, sd-bus or GIO into PID 1 buys a dependency, an allocator and a main loop we do not control. So libink: the wire format, an object tree, and a bus of Finit's own at /run/finit/bus, gated like INIT_SOCKET. It speaks the standard org.freedesktop.DBus, .Peer, .Introspectable interfaces, and Finit's own Manager1, Service1 and Cond1 on top. Methods that change something are marked privileged and answered only for a caller the kernel vouched for, via SO_PEERCRED. Server and client both, since initctl is the first thing that needs to talk to it, and its Start/Stop/Restart/Reload now go over the bus rather than the legacy socket. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
54 lines
954 B
C
54 lines
954 B
C
/* libink — shared I/O helpers.
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*
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* Server send paths (libink/dispatch.c, libink/auth.c) and the
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* client (libink/client.c) all need EINTR-resilient write_all /
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* read_full. On any other error they return -1 with an unknown
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* number of bytes already transferred.
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*
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* Copyright (c) 2026 Joachim Wiberg <troglobit@gmail.com>
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* SPDX-License-Identifier: MIT
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*/
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#include <errno.h>
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#include <unistd.h>
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#include "internal.h"
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int __io_write_all(int fd, const void *buf, size_t len)
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{
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const char *p = buf;
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while (len > 0) {
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ssize_t n = write(fd, p, len);
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if (n < 0) {
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if (errno == EINTR)
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continue;
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return -1;
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}
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p += n;
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len -= (size_t)n;
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}
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return 0;
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}
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int __io_read_full(int fd, void *buf, size_t len)
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{
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char *p = buf;
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while (len > 0) {
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ssize_t n = read(fd, p, len);
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if (n == 0)
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return -1;
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if (n < 0) {
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if (errno == EINTR)
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continue;
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return -1;
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}
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p += n;
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len -= (size_t)n;
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}
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return 0;
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}
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