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From 5d0e19fcc1cea77a72647cf96c5d3d773e8ee277 Mon Sep 17 00:00:00 2001
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From: Tomasz Torcz <tomek@pipebreaker.pl>
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Date: Wed, 28 Nov 2012 13:37:07 +0100
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Subject: iscsid: implement systemd-compatible socket activation
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---
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usr/mgmt_ipc.c | 29 +++++++++++++++++++++++++++++
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usr/mgmt_ipc.h | 1 +
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2 files changed, 30 insertions(+)
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diff --git a/usr/mgmt_ipc.c b/usr/mgmt_ipc.c
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index a1dafc9..87bd346 100644
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--- a/usr/mgmt_ipc.c
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+++ b/usr/mgmt_ipc.c
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@@ -39,6 +39,7 @@
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#define PEERUSER_MAX 64
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#define EXTMSG_MAX (64 * 1024)
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+#define SD_SOCKET_FDS_START 3
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int
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mgmt_ipc_listen(void)
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@@ -46,6 +47,12 @@ mgmt_ipc_listen(void)
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int fd, err, addr_len;
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struct sockaddr_un addr;
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+ /* first check if we have fd handled by systemd */
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+ fd = mgmt_ipc_systemd();
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+ if (fd >= 0)
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+ return fd;
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+
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+ /* manually establish a socket */
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fd = socket(AF_LOCAL, SOCK_STREAM, 0);
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if (fd < 0) {
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log_error("Can not create IPC socket");
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@@ -73,6 +80,28 @@ mgmt_ipc_listen(void)
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return fd;
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}
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+int mgmt_ipc_systemd(void)
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+{
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+ const char *env;
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+
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+ env = getenv("LISTEN_PID");
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+
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+ if (!env || (strtoul(env, NULL, 10) != getpid()))
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+ return -EINVAL;
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+
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+ env = getenv("LISTEN_FDS");
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+
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+ if (!env)
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+ return -EINVAL;
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+
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+ if (strtoul(env, NULL, 10) != 1) {
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+ log_error("Did not receive exactly one IPC socket from systemd");
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+ return -EINVAL;
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+ }
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+
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+ return SD_SOCKET_FDS_START;
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+}
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+
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void
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mgmt_ipc_close(int fd)
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{
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diff --git a/usr/mgmt_ipc.h b/usr/mgmt_ipc.h
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index 7d8ce72..55972ed 100644
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--- a/usr/mgmt_ipc.h
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+++ b/usr/mgmt_ipc.h
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@@ -112,6 +112,7 @@ typedef int mgmt_ipc_fn_t(struct queue_task *);
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struct queue_task;
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void mgmt_ipc_write_rsp(struct queue_task *qtask, int err);
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int mgmt_ipc_listen(void);
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+int mgmt_ipc_systemd(void);
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void mgmt_ipc_close(int fd);
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void mgmt_ipc_handle(int accept_fd);
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--
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1.7.11.7
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