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Clean up comments, organize code snippets added at different times into
a slightly less random order.
1 parent 249fe81 commit 7a161ac

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‎src/backend/main/main.c

Lines changed: 79 additions & 48 deletions
Original file line numberDiff line numberDiff line change
@@ -1,21 +1,29 @@
11
/*-------------------------------------------------------------------------
22
*
33
* main.c
4-
* Stub main() routine for the postgres backend.
4+
* Stub main() routine for the postgres executable.
5+
*
6+
* This does some essential startup tasks for any incarnation of postgres
7+
* (postmaster, standalone backend, or standalone bootstrap mode) and then
8+
* dispatches to the proper FooMain() routine for the incarnation.
9+
*
510
*
611
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
712
* Portions Copyright (c) 1994, Regents of the University of California
813
*
914
*
1015
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/main/main.c,v 1.34 2000/11/16 05:51:00 momjian Exp $
16+
* $Header: /cvsroot/pgsql/src/backend/main/main.c,v 1.35 2000/11/25 03:45:47 tgl Exp $
1217
*
1318
*-------------------------------------------------------------------------
1419
*/
1520
#include "postgres.h"
1621

1722
#include <pwd.h>
1823
#include <unistd.h>
24+
#ifdef USE_LOCALE
25+
#include <locale.h>
26+
#endif
1927

2028
#if defined(__alpha) && !defined(linux) && !defined(__FreeBSD__)
2129
#include <sys/sysinfo.h>
@@ -25,23 +33,35 @@
2533
#undef ASSEMBLER
2634
#endif
2735

28-
#ifdef USE_LOCALE
29-
#include <locale.h>
30-
#endif
3136
#include "miscadmin.h"
3237
#include "bootstrap/bootstrap.h"
3338
#include "tcop/tcopprot.h"
3439

40+
3541
#define NOROOTEXEC "\
36-
\n\"root\" execution of the PostgreSQL backend is not permitted.\n\n\
37-
The backend must be started under its own userid to prevent\n\
42+
\n\"root\" execution of the PostgreSQL server is not permitted.\n\n\
43+
The server must be started under an unprivileged userid to prevent\n\
3844
a possible system security compromise. See the INSTALL file for\n\
39-
more information on how to properly start the postmaster.\n\n"
45+
more information on how to properly start the server.\n\n"
46+
4047

4148
int
4249
main(int argc, char *argv[])
4350
{
4451
int len;
52+
struct passwd *pw;
53+
54+
/*
55+
* Place platform-specific startup hacks here. This is the right
56+
* place to put code that must be executed early in launch of either
57+
* a postmaster, a standalone backend, or a standalone bootstrap run.
58+
* Note that this code will NOT be executed when a backend or
59+
* sub-bootstrap run is forked by the postmaster.
60+
*
61+
* XXX The need for code here is proof that the platform in question
62+
* is too brain-dead to provide a standard C execution environment
63+
* without help. Avoid adding more here, if you can.
64+
*/
4565

4666
#if defined(__alpha)
4767
#ifdef NOFIXADE
@@ -52,78 +72,89 @@ main(int argc, char *argv[])
5272
int buffer[] = {SSIN_UACPROC, UAC_NOPRINT};
5373

5474
#endif /* NOPRINTADE */
55-
#endif
75+
#endif /* __alpha */
5676

57-
#ifdef USE_LOCALE
58-
setlocale(LC_CTYPE, ""); /* take locale information from an
59-
* environment */
60-
setlocale(LC_COLLATE, "");
61-
setlocale(LC_MONETARY, "");
62-
#endif
6377
#if defined(NOFIXADE) || defined(NOPRINTADE)
6478

65-
/*
66-
* Must be first so that the bootstrap code calls it, too. (Only
67-
* needed on some RISC architectures.)
68-
*/
69-
7079
#if defined(ultrix4)
7180
syscall(SYS_sysmips, MIPS_FIXADE, 0, NULL, NULL, NULL);
7281
#endif
7382

7483
#if defined(__alpha)
7584
if (setsysinfo(SSI_NVPAIRS, buffer, 1, (caddr_t) NULL,
7685
(unsigned long) NULL) < 0)
77-
elog(NOTICE, "setsysinfo failed: %d\n", errno);
86+
fprintf(stderr, "setsysinfo failed: %d\n", errno);
7887
#endif
7988

8089
#endif /* NOFIXADE || NOPRINTADE */
8190

91+
#ifdef __BEOS__
92+
/* BeOS-specific actions on startup */
93+
beos_startup(argc,argv);
94+
#endif
95+
8296
/*
83-
* use one executable for both postgres and postmaster, invoke one or
84-
* the other depending on the name of the executable
97+
* Not-quite-so-platform-specific startup environment checks.
98+
* Still best to minimize these.
8599
*/
86-
len = strlen(argv[0]);
87100

88-
/* OK this is going to seem weird, but BeOS is presently basically
89-
* a single user system. There is work going on, but at present it'll
90-
* say that every user is uid 0, i.e. root. We'll inhibit this check
91-
* until Be get the system working with multiple users!!
92-
*/
101+
/*
102+
* Make sure we are not running as root.
103+
*
104+
* BeOS currently runs everything as root :-(, so this check must
105+
* be temporarily disabled there...
106+
*/
93107
#ifndef __BEOS__
94-
if (!geteuid())
108+
if (geteuid() == 0)
95109
{
96110
fprintf(stderr, "%s", NOROOTEXEC);
97111
exit(1);
98112
}
99113
#endif /* __BEOS__ */
100114

101-
#ifdef __BEOS__
102-
/* Specific beos actions on startup */
103-
beos_startup(argc,argv);
115+
/*
116+
* Set up locale information from environment, in only the categories
117+
* needed by Postgres; leave other categories set to default "C".
118+
* (Note that CTYPE and COLLATE will be overridden later from pg_control
119+
* if we are in an already-initialized database. We set them here so
120+
* that they will be available to fill pg_control during initdb.)
121+
*/
122+
#ifdef USE_LOCALE
123+
setlocale(LC_CTYPE, "");
124+
setlocale(LC_COLLATE, "");
125+
setlocale(LC_MONETARY, "");
104126
#endif
105127

128+
/*
129+
* Now dispatch to one of PostmasterMain, PostgresMain, or BootstrapMain
130+
* depending on the program name (and possibly first argument) we
131+
* were called with. The lack of consistency here is historical.
132+
*/
133+
len = strlen(argv[0]);
106134

107-
if (len >= 10 && !strcmp(argv[0] + len - 10, "postmaster"))
135+
if (len >= 10 && strcmp(argv[0] + len - 10, "postmaster") == 0)
136+
{
137+
/* Called as "postmaster" */
108138
exit(PostmasterMain(argc, argv));
139+
}
109140

110141
/*
111-
* if the first argument is "-boot", then invoke the backend in
112-
* bootstrap mode
142+
* If the first argument is "-boot", then invoke bootstrap mode.
143+
* Note we remove "-boot" from the arguments passed on to BootstrapMain.
113144
*/
114145
if (argc > 1 && strcmp(argv[1], "-boot") == 0)
115-
exit(BootstrapMain(argc - 1, argv + 1)); /* remove the -boot arg
116-
* from the command line */
117-
else
146+
exit(BootstrapMain(argc - 1, argv + 1));
147+
148+
/*
149+
* Otherwise we're a standalone backend. Invoke PostgresMain,
150+
* specifying current userid as the "authenticated" Postgres user name.
151+
*/
152+
pw = getpwuid(geteuid());
153+
if (pw == NULL)
118154
{
119-
struct passwd *pw;
120-
121-
pw = getpwuid(geteuid());
122-
if (!pw)
123-
{
124-
fprintf(stderr, "%s: invalid current euid", argv[0]);
125-
exit(1);
126-
}
127-
exit(PostgresMain(argc, argv, argc, argv, pw->pw_name));
155+
fprintf(stderr, "%s: invalid current euid", argv[0]);
156+
exit(1);
128157
}
158+
159+
exit(PostgresMain(argc, argv, argc, argv, pw->pw_name));
129160
}

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