Paolo Bonzini | 53fabd4 | 2017-03-16 16:29:45 +0100 | [diff] [blame] | 1 | /* |
| 2 | * systemd socket activation support |
| 3 | * |
| 4 | * Copyright 2017 Red Hat, Inc. and/or its affiliates |
| 5 | * |
| 6 | * Authors: |
| 7 | * Richard W.M. Jones <rjones@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 10 | * See the COPYING file in the top-level directory. |
| 11 | */ |
| 12 | |
| 13 | #include "qemu/osdep.h" |
| 14 | #include "qemu/systemd.h" |
| 15 | #include "qemu/cutils.h" |
| 16 | #include "qemu/error-report.h" |
| 17 | |
| 18 | #ifndef _WIN32 |
| 19 | unsigned int check_socket_activation(void) |
| 20 | { |
| 21 | const char *s; |
| 22 | unsigned long pid; |
| 23 | unsigned long nr_fds; |
| 24 | unsigned int i; |
| 25 | int fd; |
| 26 | int err; |
| 27 | |
| 28 | s = getenv("LISTEN_PID"); |
| 29 | if (s == NULL) { |
| 30 | return 0; |
| 31 | } |
| 32 | err = qemu_strtoul(s, NULL, 10, &pid); |
| 33 | if (err) { |
| 34 | return 0; |
| 35 | } |
| 36 | if (pid != getpid()) { |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | s = getenv("LISTEN_FDS"); |
| 41 | if (s == NULL) { |
| 42 | return 0; |
| 43 | } |
| 44 | err = qemu_strtoul(s, NULL, 10, &nr_fds); |
| 45 | if (err) { |
| 46 | return 0; |
| 47 | } |
| 48 | assert(nr_fds <= UINT_MAX); |
| 49 | |
| 50 | /* So these are not passed to any child processes we might start. */ |
| 51 | unsetenv("LISTEN_FDS"); |
| 52 | unsetenv("LISTEN_PID"); |
| 53 | |
| 54 | /* So the file descriptors don't leak into child processes. */ |
| 55 | for (i = 0; i < nr_fds; ++i) { |
| 56 | fd = FIRST_SOCKET_ACTIVATION_FD + i; |
| 57 | if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) { |
| 58 | /* If we cannot set FD_CLOEXEC then it probably means the file |
| 59 | * descriptor is invalid, so socket activation has gone wrong |
| 60 | * and we should exit. |
| 61 | */ |
| 62 | error_report("Socket activation failed: " |
| 63 | "invalid file descriptor fd = %d: %m", |
| 64 | fd); |
| 65 | exit(EXIT_FAILURE); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | return (unsigned int) nr_fds; |
| 70 | } |
| 71 | |
| 72 | #else /* !_WIN32 */ |
| 73 | unsigned int check_socket_activation(void) |
| 74 | { |
| 75 | return 0; |
| 76 | } |
| 77 | #endif |