diff options
Diffstat (limited to 'src/os-unix.h')
| -rw-r--r-- | src/os-unix.h | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/src/os-unix.h b/src/os-unix.h deleted file mode 100644 index 097d300..0000000 --- a/src/os-unix.h +++ /dev/null @@ -1,125 +0,0 @@ -/* - * Copyright © 2023 Michael Smith <mikesmiffy128@gmail.com> - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH - * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY - * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, - * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM - * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR - * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR - * PERFORMANCE OF THIS SOFTWARE. - */ - -/* Unix-specific definitions for os.h - don't include this directly! */ - -#ifdef __GNUC__ -#define EXPORT __attribute__((visibility("default"))) -#else -#define EXPORT int novis[-!!"visibility attribute requires Clang or GCC"]; -#endif -#define IMPORT - -typedef char os_char; -#define OS_LIT(x) x -#define os_snprintf snprintf -#define os_strchr strchr -#define os_strcmp strcmp -#define os_strcpy strcpy -#define os_strlen strlen -#define os_fopen fopen -#define os_open open -#define os_access access -#define os_stat stat -#define os_mkdir(f) mkdir(f, 0755) // use real mkdir(2) if the mode matters -#define os_unlink unlink -#define os_getenv getenv -#define os_getcwd getcwd - -#define OS_DLPREFIX "lib" -#define OS_DLSUFFIX ".so" - -#define OS_MAIN main - -static inline void *os_dlopen(const char *name) { - return dlopen(name, RTLD_NOW); -} -#define os_dlsym dlsym - -#ifdef __linux__ -// note: this is glibc-specific. it shouldn't be used in build-time code, just -// the plugin itself (that really shouldn't be a problem). - -// private struct hidden behind _GNU_SOURCE. see dlinfo(3) or <link.h> -struct gnu_link_map { - unsigned long l_addr; - const char *l_name; - void *l_ld; - struct gnu_link_map *l_next, *l_prev; - // [more private stuff below] -}; - -static inline void *os_dlhandle(const char *name) { - extern struct gnu_link_map *_os_lmbase; // note: defined in sst.c for now - if (!_os_lmbase) { // IMPORTANT: not thread safe. don't forget later! - _os_lmbase = (struct gnu_link_map *)dlopen("libc.so.6", - RTLD_LAZY | RTLD_NOLOAD); - dlclose(_os_lmbase); // assume success - while (_os_lmbase->l_prev) _os_lmbase = _os_lmbase->l_prev; - } - // this is a tiny bit crude, but basically okay. we just want to find - // something that roughly matches the basename, rather than needing an exact - // path, in a manner vaguely similar to Windows' GetModuleHandle(). that way - // we can just look up client.so or something without having to figure out - // where exactly that is. - for (struct gnu_link_map *lm = _os_lmbase; lm; lm = lm->l_next) { - if (name[0] == '/') { - if (!strcmp(name, lm->l_name)) return lm; - continue; - } - int namelen = strlen(lm->l_name); - int sublen = strlen(name); - if (sublen >= namelen) continue; - if (lm->l_name[namelen - sublen - 1] == '/' && !memcmp( - lm->l_name + namelen - sublen, name, sublen)) { - return lm; - } - } - return 0; -} - -static inline int os_dlfile(void *m, char *buf, int sz) { - struct gnu_link_map *lm = m; - int ssz = strlen(lm->l_name) + 1; - if (ssz > sz) { errno = ENAMETOOLONG; return -1; } - memcpy(buf, lm->l_name, ssz); - return ssz; -} - -#endif - -// unix mprot flags are much nicer but cannot be defined in terms of the windows -// ones, so we use the windows ones and define them in terms of the unix ones. -// another victory for stupid! -#define PAGE_NOACCESS 0 -#define PAGE_READONLY PROT_READ -#define PAGE_READWRITE PROT_READ | PROT_WRITE -#define PAGE_EXECUTE_READ PROT_READ | PROT_EXEC -#define PAGE_EXECUTE_READWRITE PROT_READ | PROT_WRITE | PROT_EXEC - -static inline bool os_mprot(void *addr, int len, int fl) { - // round down address and round up size - addr = (void *)((unsigned long)addr & ~(4095)); - len = len + 4095 & ~(4095); - return mprotect(addr, len, fl) != -1; -} - -static inline void os_randombytes(void *buf, int sz) { - // if this call fails, the system is doomed, so loop until success and pray. - while (getentropy(buf, sz) == -1); -} - -// vi: sw=4 ts=4 noet tw=80 cc=80 |