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Support having multiple Unix-domain sockets per postmaster.

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Replace unix_socket_directory with unix_socket_directories, which is a list
of socket directories, and adjust postmaster's code to allow zero or more
Unix-domain sockets to be created.

This is mostly a straightforward change, but since the Unix sockets ought
to be created after the TCP/IP sockets for safety reasons (better chance
of detecting a port number conflict), AddToDataDirLockFile needs to be
fixed to support out-of-order updates of data directory lockfile lines.
That's a change that had been foreseen to be necessary someday anyway.

Honza Horak, reviewed and revised by Tom Lane
This commit is contained in:
Tom Lane
2012-08-10 17:26:44 -04:00
parent 85642ec00b
commit c9b0cbe98b
17 changed files with 369 additions and 126 deletions
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7
src/include/miscadmin.h
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@@ -411,7 +411,7 @@ extern char *local_preload_libraries_string;
* 2 data directory path
* 3 postmaster start timestamp (time_t representation)
* 4 port number
* 5 socket directory path (empty on Windows)
* 5 first Unix socket directory path (empty if none)
* 6 first listen_address (IP address or "*"; empty if no TCP port)
* 7 shared memory key (not present on Windows)
*
@@ -429,8 +429,9 @@ extern char *local_preload_libraries_string;
#define LOCK_FILE_LINE_SHMEM_KEY 7
extern void CreateDataDirLockFile(bool amPostmaster);
extern void CreateSocketLockFile(const char *socketfile, bool amPostmaster);
extern void TouchSocketLockFile(void);
extern void CreateSocketLockFile(const char *socketfile, bool amPostmaster,
const char *socketDir);
extern void TouchSocketLockFiles(void);
extern void AddToDataDirLockFile(int target_line, const char *str);
extern void ValidatePgVersion(const char *path);
extern void process_shared_preload_libraries(void);