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Commit9e16195

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committed
Second try at a portable unsetenv().
1 parentdadce65 commit9e16195

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6 files changed

+71
-25
lines changed

6 files changed

+71
-25
lines changed

‎configure

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -11744,7 +11744,8 @@ fi
1174411744

1174511745

1174611746

11747-
for ac_func in crypt fseeko getopt getrusage inet_aton random rint srandom strcasecmp strdup strerror strtol strtoul
11747+
11748+
for ac_func in crypt fseeko getopt getrusage inet_aton random rint srandom strcasecmp strdup strerror strtol strtoul unsetenv
1174811749
do
1174911750
as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
1175011751
echo "$as_me:$LINENO: checking for $ac_func" >&5

‎configure.in

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
dnl Process this file with autoconf to produce a configure script.
2-
dnl $PostgreSQL: pgsql/configure.in,v 1.343 2004/04/30 16:08:01 momjian Exp $
2+
dnl $PostgreSQL: pgsql/configure.in,v 1.344 2004/05/05 21:18:29 tgl Exp $
33
dnl
44
dnl Developers, please strive to achieve this order:
55
dnl
@@ -858,7 +858,7 @@ else
858858
AC_CHECK_FUNCS([fpclass fp_class fp_class_d class], [break])
859859
fi
860860

861-
AC_REPLACE_FUNCS([crypt fseeko getopt getrusage inet_aton random rint srandom strcasecmp strdup strerror strtol strtoul])
861+
AC_REPLACE_FUNCS([crypt fseeko getopt getrusage inet_aton random rint srandom strcasecmp strdup strerror strtol strtoul unsetenv])
862862

863863
# system's version of getaddrinfo(), if any, may be used only if we found
864864
# a definition for struct addrinfo; see notes in src/include/getaddrinfo.h

‎src/bin/initdb/initdb.c

Lines changed: 3 additions & 21 deletions
Original file line numberDiff line numberDiff line change
@@ -43,7 +43,7 @@
4343
* Portions Copyright (c) 1994, Regents of the University of California
4444
* Portions taken from FreeBSD.
4545
*
46-
* $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.24 2004/05/0516:09:31 tgl Exp $
46+
* $PostgreSQL: pgsql/src/bin/initdb/initdb.c,v 1.25 2004/05/0521:18:29 tgl Exp $
4747
*
4848
*-------------------------------------------------------------------------
4949
*/
@@ -263,24 +263,6 @@ xstrdup(const char *s)
263263
returnresult;
264264
}
265265

266-
/*
267-
* unsetenv() doesn't exist everywhere, so emulate it with this ugly
268-
* but well-tested technique (borrowed from backend's variable.c).
269-
*/
270-
staticvoid
271-
pg_unsetenv(constchar*varname)
272-
{
273-
char*envstr=xmalloc(strlen(varname)+2);
274-
275-
/* First, override any existing setting by forcibly defining the var */
276-
sprintf(envstr,"%s=",varname);
277-
putenv(envstr);
278-
279-
/* Now we can clobber the variable definition this way: */
280-
strcpy(envstr,"=");
281-
putenv(envstr);
282-
}
283-
284266
/*
285267
* delete a directory tree recursively
286268
* assumes path points to a valid directory
@@ -1260,10 +1242,10 @@ bootstrap_template1(char *short_version)
12601242
snprintf(cmd,sizeof(cmd),"LC_CTYPE=%s",lc_ctype);
12611243
putenv(xstrdup(cmd));
12621244

1263-
pg_unsetenv("LC_ALL");
1245+
unsetenv("LC_ALL");
12641246

12651247
/* Also ensure backend isn't confused by this environment var: */
1266-
pg_unsetenv("PGCLIENTENCODING");
1248+
unsetenv("PGCLIENTENCODING");
12671249

12681250
snprintf(cmd,sizeof(cmd),
12691251
"\"%s/postgres\" -boot -x1 %s %s template1",

‎src/include/c.h

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -12,7 +12,7 @@
1212
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
1313
* Portions Copyright (c) 1994, Regents of the University of California
1414
*
15-
* $PostgreSQL: pgsql/src/include/c.h,v 1.162 2004/04/30 20:47:33 momjian Exp $
15+
* $PostgreSQL: pgsql/src/include/c.h,v 1.163 2004/05/05 21:18:29 tgl Exp $
1616
*
1717
*-------------------------------------------------------------------------
1818
*/
@@ -720,6 +720,10 @@ extern intvsnprintf(char *str, size_t count, const char *fmt, va_list args);
720720
#definememmove(d,s,c)bcopy(s, d, c)
721721
#endif
722722

723+
#ifndefHAVE_UNSETENV
724+
externvoidunsetenv(constchar*name);
725+
#endif
726+
723727
#ifndefDLLIMPORT
724728
#defineDLLIMPORT/* no special DLL markers on most ports */
725729
#endif

‎src/include/pg_config.h.in

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -530,6 +530,9 @@
530530
/* Define to 1 if you have unix sockets. */
531531
#undef HAVE_UNIX_SOCKETS
532532

533+
/* Define to 1 if you have the `unsetenv' function. */
534+
#undef HAVE_UNSETENV
535+
533536
/* Define to 1 if you have the `utime' function. */
534537
#undef HAVE_UTIME
535538

‎src/port/unsetenv.c

Lines changed: 56 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,56 @@
1+
/*-------------------------------------------------------------------------
2+
*
3+
* unsetenv.c
4+
* unsetenv() emulation for machines without it
5+
*
6+
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
7+
* Portions Copyright (c) 1994, Regents of the University of California
8+
*
9+
*
10+
* IDENTIFICATION
11+
* $PostgreSQL: pgsql/src/port/unsetenv.c,v 1.1 2004/05/05 21:18:29 tgl Exp $
12+
*
13+
*-------------------------------------------------------------------------
14+
*/
15+
16+
#include"c.h"
17+
18+
19+
void
20+
unsetenv(constchar*name)
21+
{
22+
char*envstr;
23+
24+
if (getenv(name)==NULL)
25+
return;/* no work */
26+
27+
/*
28+
* The technique embodied here works if libc follows the Single Unix Spec
29+
* and actually uses the storage passed to putenv() to hold the environ
30+
* entry. When we clobber the entry in the second step we are ensuring
31+
* that we zap the actual environ member. However, there are some libc
32+
* implementations (notably recent BSDs) that do not obey SUS but copy
33+
* the presented string. This method fails on such platforms. Hopefully
34+
* all such platforms have unsetenv() and thus won't be using this hack.
35+
*
36+
* Note that repeatedly setting and unsetting a var using this code
37+
* will leak memory.
38+
*/
39+
40+
envstr= (char*)malloc(strlen(name)+2);
41+
if (!envstr)/* not much we can do if no memory */
42+
return;
43+
44+
/* Override the existing setting by forcibly defining the var */
45+
sprintf(envstr,"%s=",name);
46+
putenv(envstr);
47+
48+
/* Now we can clobber the variable definition this way: */
49+
strcpy(envstr,"=");
50+
51+
/*
52+
* This last putenv cleans up if we have multiple zero-length names
53+
* as a result of unsetting multiple things.
54+
*/
55+
putenv(envstr);
56+
}

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