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[PATCH 3/5] Permit systemd-allocated socket file-descriptors to be used.
From: |
Matthew Leach |
Subject: |
[PATCH 3/5] Permit systemd-allocated socket file-descriptors to be used. |
Date: |
Sat, 26 Mar 2016 21:16:40 +0000 |
* src/process.c (connect_network_socket): Allow a systemd-allocated
file-descriptor to be passed, and use it, avoiding the call to
socket() and bind().
(Fmake_network_process): Allow users to pass in :systemd-fd on the
parameter plist to use a systemd fd.
(wait_reading_process_output): Call socket() & bind() every time.
(syms_of_process): New symbol.
---
src/process.c | 28 +++++++++++++++++++++-------
1 file changed, 21 insertions(+), 7 deletions(-)
diff --git a/src/process.c b/src/process.c
index 198e7de..b6bc757 100644
--- a/src/process.c
+++ b/src/process.c
@@ -3075,7 +3075,8 @@ finish_after_tls_connection (Lisp_Object proc)
#endif
static void
-connect_network_socket (Lisp_Object proc, Lisp_Object ip_addresses)
+connect_network_socket (Lisp_Object proc, Lisp_Object ip_addresses,
+ Lisp_Object systemd_fd)
{
ptrdiff_t count = SPECPDL_INDEX ();
ptrdiff_t count1;
@@ -3089,6 +3090,8 @@ connect_network_socket (Lisp_Object proc, Lisp_Object
ip_addresses)
struct Lisp_Process *p = XPROCESS (proc);
Lisp_Object contact = p->childp;
int optbits = 0;
+ int use_systemd_fd = !NILP (systemd_fd) && INTEGERP (systemd_fd) &&
+ XINT (systemd_fd) != 0;
/* Do this in case we never enter the while-loop below. */
count1 = SPECPDL_INDEX ();
@@ -3109,7 +3112,11 @@ connect_network_socket (Lisp_Object proc, Lisp_Object
ip_addresses)
sa = xmalloc (addrlen);
conv_lisp_to_sockaddr (family, ip_address, sa, addrlen);
- s = socket (family, p->socktype | SOCK_CLOEXEC, p->ai_protocol);
+ if (use_systemd_fd)
+ s = XINT (systemd_fd);
+ else
+ s = socket (family, p->socktype | SOCK_CLOEXEC, p->ai_protocol);
+
if (s < 0)
{
xerrno = errno;
@@ -3168,8 +3175,11 @@ connect_network_socket (Lisp_Object proc, Lisp_Object
ip_addresses)
report_file_error ("Cannot set reuse option on server
socket", Qnil);
}
- if (bind (s, sa, addrlen))
- report_file_error ("Cannot bind server socket", Qnil);
+ /* If we are passed in an fd from systemd, it is already
+ bound. */
+ if (!use_systemd_fd)
+ if (bind (s, sa, addrlen))
+ report_file_error ("Cannot bind server socket", Qnil);
#ifdef HAVE_GETSOCKNAME
if (p->port == 0)
@@ -3534,6 +3544,8 @@ The following network options can be specified for this
connection:
(this is allowed by default for a server process).
:bindtodevice NAME -- bind to interface NAME. Using this may require
special privileges on some systems.
+:systemd-fd INT -- use this file-descriptor, passed in through systemd,
+ and don't call socket() and bind().
Consult the relevant system programmer's manual pages for more
information on using these options.
@@ -3577,7 +3589,7 @@ usage: (make-network-process &rest ARGS) */)
#endif
EMACS_INT port = 0;
Lisp_Object tem;
- Lisp_Object name, buffer, host, service, address;
+ Lisp_Object name, buffer, host, service, address, systemd_fd;
Lisp_Object filter, sentinel;
Lisp_Object ip_addresses = Qnil;
int socktype;
@@ -3618,6 +3630,7 @@ usage: (make-network-process &rest ARGS) */)
buffer = Fplist_get (contact, QCbuffer);
filter = Fplist_get (contact, QCfilter);
sentinel = Fplist_get (contact, QCsentinel);
+ systemd_fd = Fplist_get (contact, QCsystemd_fd);
CHECK_STRING (name);
@@ -3914,7 +3927,7 @@ usage: (make-network-process &rest ARGS) */)
}
#endif
- connect_network_socket (proc, ip_addresses);
+ connect_network_socket (proc, ip_addresses, systemd_fd);
return proc;
}
@@ -4848,7 +4861,7 @@ wait_reading_process_output (intmax_t time_limit, int
nsecs, int read_kbd,
{
Lisp_Object ip_addresses = check_for_dns (aproc);
if (!NILP (ip_addresses) && !EQ (ip_addresses, Qt))
- connect_network_socket (aproc, ip_addresses);
+ connect_network_socket (aproc, ip_addresses, Qnil);
else
retry_for_async = true;
}
@@ -7837,6 +7850,7 @@ syms_of_process (void)
DEFSYM (QCserver, ":server");
DEFSYM (QCnowait, ":nowait");
DEFSYM (QCsentinel, ":sentinel");
+ DEFSYM (QCsystemd_fd, ":systemd-fd");
DEFSYM (QCtls_parameters, ":tls-parameters");
DEFSYM (Qnsm_verify_connection, "nsm-verify-connection");
DEFSYM (QClog, ":log");
--
2.7.4
[PATCH 1/5] Check for libsystemd when building Emacs., Matthew Leach, 2016/03/26
Re: [PATCH 0/5] Add systemd socket launching support., Alan Mackenzie, 2016/03/26