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Commitbf80f41

Browse files
author
Bryan Henderson
committed
Add utils directory for cross-subsystem tools to keep make files from having
to be sleazy and reach into other subsystems' directories. First entry inthis directory is the PG_VERSION file interface, which must be used by thebackend and also the pg_version program (which is used by initdb).
1 parent6f708e4 commitbf80f41

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4 files changed

+183
-1
lines changed

4 files changed

+183
-1
lines changed

‎src/Makefile

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
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#
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#
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# IDENTIFICATION
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# $Header: /cvsroot/pgsql/src/Makefile,v 1.9 1996/10/21 06:56:55 bryanh Exp $
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# $Header: /cvsroot/pgsql/src/Makefile,v 1.10 1996/11/11 13:51:20 bryanh Exp $
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#
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# NOTES
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#objdir- location of the objects and generated files (eg. obj)
@@ -31,6 +31,7 @@ XARGS = xargs
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you can build Postgres.;\
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false;\
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fi
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$(MAKE) -C utils$@
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$(MAKE) -C backend$@
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$(MAKE) -C libpq$@
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ifeq ($(HAVE_Cplusplus), true)

‎src/utils/Makefile

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@@ -0,0 +1,29 @@
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#-------------------------------------------------------------------------
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#
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# Makefile--
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# Makefile for utils
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#
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# IDENTIFICATION
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# $Header: /cvsroot/pgsql/src/utils/Attic/Makefile,v 1.1 1996/11/11 13:51:55 bryanh Exp $
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#
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#-------------------------------------------------------------------------
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SRCDIR = ..
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include ../Makefile.global
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INCLUDE_OPT = -I../include
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CFLAGS+=$(INCLUDE_OPT)
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all: version.o
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dependdep:
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$(CC) -MM$(INCLUDE_OPT)*.c>depend
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clean:
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rm -f version.o
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ifeq (depend,$(wildcard depend))
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include depend
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endif
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‎src/utils/README

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@@ -0,0 +1,6 @@
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The utils directory contains components that are used by multiple subsystems
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in the Postgres source tree. We don't want subsystems reaching into other
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subsystems' directories and messing with the modularity of the system, so
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we gather any cross-subsystem utilities here.
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In particular, programs that form an interface between subsystems go here.

‎src/utils/version.c

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/*-------------------------------------------------------------------------
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*
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* version.c--
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* Routines to handle Postgres version number.
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/utils/Attic/version.c,v 1.1 1996/11/11 13:51:57 bryanh Exp $
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*
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* NOTES
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*XXX eventually, should be able to handle version identifiers
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*of length != 4.
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*
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* STANDALONE CODE - do not use error routines as this code is linked with
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* stuff that does not cinterface.a
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*-------------------------------------------------------------------------
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*/
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#include<sys/file.h>
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#include<sys/types.h>
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#include<sys/stat.h>
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#include<ctype.h>
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#include<string.h>
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#include<stdio.h>
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#include<unistd.h>
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#include"postgres.h"
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#include"storage/fd.h"/* for O_ */
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#include"version.h"
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staticvoid
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PathSetVersionFilePath(constchar*path,char*filepathbuf) {
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/*----------------------------------------------------------------------------
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PathSetVersionFilePath
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Destructively change "filepathbuf" to contain the concatenation of "path"
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and the name of the version file name.
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----------------------------------------------------------------------------*/
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if (strlen(path)> (MAXPGPATH-sizeof(PG_VERFILE)-1))
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*filepathbuf='\0';
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else
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sprintf(filepathbuf,"%s%c%s",path,SEP_CHAR,PG_VERFILE);
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}
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void
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ValidatePgVersion(constchar*path,char**reason_p) {
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/*----------------------------------------------------------------------------
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Determine whether the PG_VERSION file in directory <path> indicates
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a data version compatible with the version of this program.
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If compatible, return <*reason_p> == NULL. Otherwise, malloc space,
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fill it with a text string explaining how it isn't compatible (or why
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we can't tell), and return a pointer to that space as <*reason_p>.
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-----------------------------------------------------------------------------*/
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intfd;
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charversion[4];
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charfull_path[MAXPGPATH+1];
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#ifndefWIN32
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structstatstatbuf;
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#else
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struct_statstatbuf;
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#endif
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PathSetVersionFilePath(path,full_path);
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if (stat(full_path,&statbuf)<0) {
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*reason_p=malloc(200);
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sprintf(*reason_p,"File '%s' does not exist.",full_path);
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}else {
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fd=open(full_path,O_RDONLY,0);
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if (fd<0) {
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*reason_p=malloc(200);
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sprintf(*reason_p,"Unable to open file '%s'. Errno = %s (%d).",
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full_path,strerror(errno),errno);
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}else {
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if (read(fd,version,4)<4||
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!isascii(version[0])|| !isdigit(version[0])||
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version[1]!='.'||
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!isascii(version[2])|| !isdigit(version[2])||
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version[3]!='\n') {
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*reason_p=malloc(200);
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sprintf(*reason_p,"File '%s' does not have a valid format "
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"for a PG_VERSION file.",full_path);
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}else {
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if (version[2]!='0'+PG_VERSION||
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version[0]!='0'+PG_RELEASE) {
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*reason_p=malloc(200);
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sprintf(*reason_p,
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"Version number in file '%s' should be %d.%d, "
96+
"not %c.%c.",
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full_path,
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PG_RELEASE,PG_VERSION,version[0],version[2]);
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}else*reason_p=NULL;
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}
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close(fd);
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}
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}
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}
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void
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SetPgVersion(constchar*path,char**reason_p) {
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/*---------------------------------------------------------------------------
111+
Create the PG_VERSION file in the directory <path>.
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If we fail, allocate storage, fill it with a text string explaining why,
114+
and return a pointer to that storage as <*reason_p>. If we succeed,
115+
return *reason_p = NULL.
116+
---------------------------------------------------------------------------*/
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intfd;
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charversion[4];
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charfull_path[MAXPGPATH+1];
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PathSetVersionFilePath(path,full_path);
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fd=open(full_path,O_WRONLY|O_CREAT|O_EXCL,0666);
124+
if (fd<0) {
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*reason_p=malloc(100+strlen(full_path));
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sprintf(*reason_p,
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"Unable to create file '%s', errno from open(): %s (%d).",
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full_path,strerror(errno),errno);
129+
}else {
130+
intrc;/* return code from some function we call */
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132+
version[0]='0'+PG_RELEASE;
133+
version[1]='.';
134+
version[2]='0'+PG_VERSION;
135+
version[3]='\n';
136+
rc=write(fd,version,4);
137+
if (rc!=4) {
138+
*reason_p=malloc(100+strlen(full_path));
139+
sprintf(*reason_p,
140+
"Failed to write to file '%s', after it was already "
141+
"open. Errno from write(): %s (%d)",
142+
full_path,strerror(errno),errno);
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}else*reason_p=NULL;
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close(fd);
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}
146+
}

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