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50492ce815
Inspired by https://github.com/systemd/systemd/pull/24024 this is another user mode helper, where this might be an issue. hence let's rather be safe than sorry, and also connect stdin/stdout/stderr explicitly with /dev/null.
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <stdlib.h>
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#include "fd-util.h"
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#include "log.h"
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#include "socket-util.h"
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int main(int argc, char *argv[]) {
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static const union sockaddr_union sa = {
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.un.sun_family = AF_UNIX,
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.un.sun_path = "/run/systemd/cgroups-agent",
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};
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_cleanup_close_ int fd = -1;
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ssize_t n;
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size_t l;
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int r;
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r = rearrange_stdio(-1, -1, -1);
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if (r < 0) {
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log_error_errno(r, "Failed to connect stdin/stdout/stderr with /dev/null: %m");
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return EXIT_FAILURE;
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}
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if (argc != 2) {
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log_error("Incorrect number of arguments.");
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return EXIT_FAILURE;
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}
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log_setup();
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fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
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if (fd < 0) {
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log_debug_errno(errno, "Failed to allocate socket: %m");
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return EXIT_FAILURE;
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}
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l = strlen(argv[1]);
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n = sendto(fd, argv[1], l, 0, &sa.sa, SOCKADDR_UN_LEN(sa.un));
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if (n < 0) {
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log_debug_errno(errno, "Failed to send cgroups agent message: %m");
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return EXIT_FAILURE;
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}
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if ((size_t) n != l) {
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log_debug("Datagram size mismatch");
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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