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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:17:33 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:17:33 +0000 |
commit | 5e45211a64149b3c659b90ff2de6fa982a5a93ed (patch) | |
tree | 739caf8c461053357daa9f162bef34516c7bf452 /src/port/dlopen.c | |
parent | Initial commit. (diff) | |
download | postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.tar.xz postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.zip |
Adding upstream version 15.5.upstream/15.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/port/dlopen.c')
-rw-r--r-- | src/port/dlopen.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/port/dlopen.c b/src/port/dlopen.c new file mode 100644 index 0000000..d441dc8 --- /dev/null +++ b/src/port/dlopen.c @@ -0,0 +1,145 @@ +/*------------------------------------------------------------------------- + * + * 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 |