split out some modules and headers

[m6w6/ext-psi] / src / dl.h

diff --git a/src/dl.h b/src/dl.h
new file mode 100644 (file)
index 0000000..ee6872d
--- /dev/null
+++ b/src/dl.h
@@ -0,0 +1,89 @@
+/*******************************************************************************
+ Copyright (c) 2018, Michael Wallner <mike@php.net>.
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+     * Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+     * Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*******************************************************************************/
+
+#ifndef PSI_DLSYM_H
+#define PSI_DLSYM_H
+
+#include <stddef.h>
+#include <dlfcn.h>
+
+#ifndef RTLD_NEXT
+# define RTLD_NEXT ((void *) -1l)
+#endif
+#ifndef RTLD_DEFAULT
+# define RTLD_DEFAULT ((void *) 0)
+#endif
+
+#include "plist.h"
+
+static inline void *psi_dlsym(struct psi_plist *dllist, const char *name, const char *redir)
+{
+       void *dl, *sym = NULL;
+       const char *test = redir ?: name;
+
+again:
+       if (dllist) {
+               size_t i = 0;
+
+               while (!sym && psi_plist_get(dllist, i++, &dl)) {
+                       sym = dlsym(dl, test);
+               }
+       }
+       if (!sym) {
+               sym = dlsym(RTLD_DEFAULT, test);
+       }
+       if (!sym && test == redir) {
+               test = name;
+               goto again;
+       }
+
+       return sym;
+}
+
+static inline size_t psi_dlname(char (*buf)[], size_t *len, const char *libname)
+{
+       if (strchr(libname, '/')) {
+               return snprintf(*buf, *len, "%s", libname);
+       } else {
+               return snprintf(*buf, *len, "lib%s.%s", libname, PHP_PSI_SHLIB_SUFFIX);
+       }
+}
+
+static inline void *psi_dlopen(const char *libname)
+{
+       return dlopen(libname, RTLD_LAZY | RTLD_LOCAL);
+}
+
+static inline void psi_dlclose(void *dl)
+{
+       dlclose(dl);
+}
+
+static inline char *psi_dlerror()
+{
+       return dlerror();
+}
+
+#endif /* PSI_DLSYM_H */