mirror of
https://github.com/troglobit/finit.git
synced 2026-10-17 10:49:34 +00:00
Joachim Wiberg
da83462731
This commit introduces a bare-bones replacement for libsystemd: - Build .so file and add --with-libsystemd to configure - Add capabilities support to test/src/serv.c - Update tests to account for a Finit built w/o libsystemd support Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/* SPDX-License-Identifier: MIT-0 */
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/*
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* systemd notify protocol, supporting readiness notification on startup
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* and reloading, according to the protocol defined at:
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* https://www.freedesktop.org/software/systemd/man/latest/sd_notify.html
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*
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* This protocol is guaranteed to be stable as per:
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* https://systemd.io/PORTABILITY_AND_STABILITY/
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*/
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#define _GNU_SOURCE 1
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#include <errno.h>
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#include <inttypes.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <time.h>
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#include <unistd.h>
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/*
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* NOTE: As per spec., this function does not return POSIX OK(0) but
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* rather "a positive value", i.e., 1.
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*/
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int sd_notify(int unset_environment, const char *state)
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{
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struct sockaddr_un sun = {
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.sun_family = AF_UNIX,
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};
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size_t len, sun_len;
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const char *path;
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ssize_t written;
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int sd;
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if (!state)
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return -EINVAL;
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len = strlen(state);
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if (len == 0)
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return -EINVAL;
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/* If the variable is not set, the protocol is a noop */
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path = getenv("NOTIFY_SOCKET");
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if (!path)
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return 0; /* Not set? Nothing to do */
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/* Only AF_UNIX is supported, with path or abstract sockets */
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if (path[0] != '/' && path[0] != '@')
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return -EAFNOSUPPORT;
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/* Ensure there is room for NUL byte */
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sun_len = strlen(path);
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if (sun_len >= sizeof(sun.sun_path))
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return -E2BIG;
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strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
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if (sun.sun_path[0] == '@')
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sun.sun_path[0] = 0;
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sd = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (sd == -1)
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return -errno;
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if (connect(sd, (struct sockaddr *)&sun, offsetof(struct sockaddr_un, sun_path) + sun_len) == -1) {
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close(sd);
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return -errno;
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}
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if (unset_environment)
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unsetenv("NOTIFY_SOCKET");
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written = write(sd, state, len);
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if (written != (ssize_t) len) {
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close(sd);
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return written < 0 ? -errno : -EPROTO;
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}
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return 1;
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}
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