aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/postgresql/src/port/dlopen.c
blob: d441dc8196ad7b0d15e4712e7e0d847d41dfa671 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*-------------------------------------------------------------------------
 *
 * dlopen.c
 *	  dynamic loader for platforms without dlopen()
 *
 * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  src/port/dlopen.c
 *
 *-------------------------------------------------------------------------
 */

#include "c.h"

#if defined(__hpux)

/* System includes */
#include <a.out.h>
#include <dl.h>

void *
dlopen(const char *file, int mode)
{
	int			flags = 0;

	if (mode & RTLD_NOW)
		flags |= BIND_IMMEDIATE;
#ifdef NOT_USED
	if (mode & RTLD_LAZY)
		flags |= BIND_DEFERRED;
#endif

	return shl_load(file, flags | BIND_VERBOSE, 0L);
}

void *
dlsym(void *handle, const char *symbol)
{
	void	   *value;

	if (shl_findsym((shl_t *) & handle, symbol, TYPE_PROCEDURE, &value) == -1)
		return NULL;
	return value;
}

int
dlclose(void *handle)
{
	return shl_unload((shl_t) handle);
}

char *
dlerror(void)
{
	static char errmsg[] = "shl_load failed";

	if (errno)
		return strerror(errno);

	return errmsg;
}

#elif defined(WIN32)

static char last_dyn_error[512];

static void
set_dl_error(void)
{
	DWORD		err = GetLastError();

	if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS |
					  FORMAT_MESSAGE_FROM_SYSTEM,
					  NULL,
					  err,
					  MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
					  last_dyn_error,
					  sizeof(last_dyn_error) - 1,
					  NULL) == 0)
	{
		snprintf(last_dyn_error, sizeof(last_dyn_error) - 1,
				 "unknown error %lu", err);
	}
}

char *
dlerror(void)
{
	if (last_dyn_error[0])
		return last_dyn_error;
	else
		return NULL;
}

int
dlclose(void *handle)
{
	if (!FreeLibrary((HMODULE) handle))
	{
		set_dl_error();
		return 1;
	}
	last_dyn_error[0] = 0;
	return 0;
}

void *
dlsym(void *handle, const char *symbol)
{
	void	   *ptr;

	ptr = GetProcAddress((HMODULE) handle, symbol);
	if (!ptr)
	{
		set_dl_error();
		return NULL;
	}
	last_dyn_error[0] = 0;
	return ptr;
}

void *
dlopen(const char *file, int mode)
{
	HMODULE		h;
	int			prevmode;

	/* Disable popup error messages when loading DLLs */
	prevmode = SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
	h = LoadLibrary(file);
	SetErrorMode(prevmode);

	if (!h)
	{
		set_dl_error();
		return NULL;
	}
	last_dyn_error[0] = 0;
	return (void *) h;
}

#endif