* POSIX support functions for Lua
*/
-#define MODULE_VERSION "0.3.5"
+#define MODULE_VERSION "0.3.6"
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <errno.h>
#include "lua.h"
+#include "lualib.h"
#include "lauxlib.h"
+#include <fcntl.h>
+#if defined(__linux__) && defined(_GNU_SOURCE)
+#include <linux/falloc.h>
+#endif
+
+#if (defined(_SVID_SOURCE) && !defined(WITHOUT_MALLINFO))
+ #include <malloc.h>
+ #define WITH_MALLINFO
+#endif
+
/* Daemonization support */
static int lc_daemonize(lua_State *L)
close(0);
close(1);
close(2);
+ /* Make sure accidental use of FDs 0, 1, 2 don't cause weirdness */
+ open("/dev/null", O_RDONLY);
+ open("/dev/null", O_WRONLY);
+ open("/dev/null", O_WRONLY);
/* Final fork, use it wisely */
if(fork())
};
int lc_syslog_log(lua_State* L)
{
- int level = luaL_checkoption(L, 1, "notice", level_strings);
- level = level_constants[level];
+ int level = level_constants[luaL_checkoption(L, 1, "notice", level_strings)];
- luaL_checkstring(L, 2);
+ if(lua_gettop(L) == 3)
+ syslog(level, "%s: %s", luaL_checkstring(L, 2), luaL_checkstring(L, 3));
+ else
+ syslog(level, "%s", lua_tostring(L, 2));
- syslog(level, "%s", lua_tostring(L, 2));
return 0;
}
return 2;
}
ret = initgroups(lua_tostring(L, 1), gid);
- switch(errno)
+ if(ret)
+ {
+ switch(errno)
+ {
+ case ENOMEM:
+ lua_pushnil(L);
+ lua_pushstring(L, "no-memory");
+ break;
+ case EPERM:
+ lua_pushnil(L);
+ lua_pushstring(L, "permission-denied");
+ break;
+ default:
+ lua_pushnil(L);
+ lua_pushstring(L, "unknown-error");
+ }
+ }
+ else
{
- case 0:
lua_pushboolean(L, 1);
lua_pushnil(L);
- break;
- case ENOMEM:
- lua_pushnil(L);
- lua_pushstring(L, "no-memory");
- break;
- case EPERM:
- lua_pushnil(L);
- lua_pushstring(L, "permission-denied");
- break;
- default:
- lua_pushnil(L);
- lua_pushstring(L, "unknown-error");
}
return 2;
}
if (!strcmp(s, "MEMLOCK")) return RLIMIT_MEMLOCK;
if (!strcmp(s, "NPROC")) return RLIMIT_NPROC;
if (!strcmp(s, "RSS")) return RLIMIT_RSS;
+#endif
+#ifdef RLIMIT_NICE
+ if (!strcmp(s, "NICE")) return RLIMIT_NICE;
#endif
return -1;
}
+unsigned long int arg_to_rlimit(lua_State* L, int idx, rlim_t current) {
+ switch(lua_type(L, idx)) {
+ case LUA_TSTRING:
+ if(strcmp(lua_tostring(L, idx), "unlimited") == 0)
+ return RLIM_INFINITY;
+ case LUA_TNUMBER:
+ return lua_tointeger(L, idx);
+ case LUA_TNONE:
+ case LUA_TNIL:
+ return current;
+ default:
+ return luaL_argerror(L, idx, "unexpected type");
+ }
+}
+
int lc_setrlimit(lua_State *L) {
+ struct rlimit lim;
int arguments = lua_gettop(L);
- int softlimit = -1;
- int hardlimit = -1;
- const char *resource = NULL;
int rid = -1;
if(arguments < 1 || arguments > 3) {
lua_pushboolean(L, 0);
lua_pushstring(L, "incorrect-arguments");
+ return 2;
}
- resource = luaL_checkstring(L, 1);
- softlimit = luaL_checkinteger(L, 2);
- hardlimit = luaL_checkinteger(L, 3);
+ rid = string2resource(luaL_checkstring(L, 1));
+ if (rid == -1) {
+ lua_pushboolean(L, 0);
+ lua_pushstring(L, "invalid-resource");
+ return 2;
+ }
- rid = string2resource(resource);
- if (rid != -1) {
- struct rlimit lim;
- struct rlimit lim_current;
-
- if (softlimit < 0 || hardlimit < 0) {
- if (getrlimit(rid, &lim_current)) {
- lua_pushboolean(L, 0);
- lua_pushstring(L, "getrlimit-failed");
- return 2;
- }
- }
+ /* Fetch current values to use as defaults */
+ if (getrlimit(rid, &lim)) {
+ lua_pushboolean(L, 0);
+ lua_pushstring(L, "getrlimit-failed");
+ return 2;
+ }
- if (softlimit < 0) lim.rlim_cur = lim_current.rlim_cur;
- else lim.rlim_cur = softlimit;
- if (hardlimit < 0) lim.rlim_max = lim_current.rlim_max;
- else lim.rlim_max = hardlimit;
+ lim.rlim_cur = arg_to_rlimit(L, 2, lim.rlim_cur);
+ lim.rlim_max = arg_to_rlimit(L, 3, lim.rlim_max);
- if (setrlimit(rid, &lim)) {
- lua_pushboolean(L, 0);
- lua_pushstring(L, "setrlimit-failed");
- return 2;
- }
- } else {
- /* Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard. */
+ if (setrlimit(rid, &lim)) {
lua_pushboolean(L, 0);
- lua_pushstring(L, "invalid-resource");
+ lua_pushstring(L, "setrlimit-failed");
return 2;
}
lua_pushboolean(L, 1);
return 2;
}
+
+
resource = luaL_checkstring(L, 1);
rid = string2resource(resource);
if (rid != -1) {
return 2;
}
lua_pushboolean(L, 1);
- lua_pushnumber(L, lim.rlim_cur);
- lua_pushnumber(L, lim.rlim_max);
+ if(lim.rlim_cur == RLIM_INFINITY)
+ lua_pushstring(L, "unlimited");
+ else
+ lua_pushnumber(L, lim.rlim_cur);
+ if(lim.rlim_max == RLIM_INFINITY)
+ lua_pushstring(L, "unlimited");
+ else
+ lua_pushnumber(L, lim.rlim_max);
return 3;
}
struct utsname uname_info;
if(uname(&uname_info) != 0)
{
+ lua_pushnil(L);
lua_pushstring(L, strerror(errno));
return 2;
}
return 1;
}
+int lc_setenv(lua_State* L)
+{
+ const char *var = luaL_checkstring(L, 1);
+ const char *value;
+
+ /* If the second argument is nil or nothing, unset the var */
+ if(lua_isnoneornil(L, 2))
+ {
+ if(unsetenv(var) != 0)
+ {
+ lua_pushnil(L);
+ lua_pushstring(L, strerror(errno));
+ return 2;
+ }
+ lua_pushboolean(L, 1);
+ return 1;
+ }
+
+ value = luaL_checkstring(L, 2);
+
+ if(setenv(var, value, 1) != 0)
+ {
+ lua_pushnil(L);
+ lua_pushstring(L, strerror(errno));
+ return 2;
+ }
+
+ lua_pushboolean(L, 1);
+ return 1;
+}
+
+#ifdef WITH_MALLINFO
+int lc_meminfo(lua_State* L)
+{
+ struct mallinfo info = mallinfo();
+ lua_newtable(L);
+ /* This is the total size of memory allocated with sbrk by malloc, in bytes. */
+ lua_pushinteger(L, info.arena);
+ lua_setfield(L, -2, "allocated");
+ /* This is the total size of memory allocated with mmap, in bytes. */
+ lua_pushinteger(L, info.hblkhd);
+ lua_setfield(L, -2, "allocated_mmap");
+ /* This is the total size of memory occupied by chunks handed out by malloc. */
+ lua_pushinteger(L, info.uordblks);
+ lua_setfield(L, -2, "used");
+ /* This is the total size of memory occupied by free (not in use) chunks. */
+ lua_pushinteger(L, info.fordblks);
+ lua_setfield(L, -2, "unused");
+ /* This is the size of the top-most releasable chunk that normally borders the
+ end of the heap (i.e., the high end of the virtual address space's data segment). */
+ lua_pushinteger(L, info.keepcost);
+ lua_setfield(L, -2, "returnable");
+ return 1;
+}
+#endif
+
+/* File handle extraction blatantly stolen from
+ * https://github.com/rrthomas/luaposix/blob/master/lposix.c#L631
+ * */
+
+#if _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L || defined(_GNU_SOURCE)
+int lc_fallocate(lua_State* L)
+{
+ off_t offset, len;
+ FILE *f = *(FILE**) luaL_checkudata(L, 1, LUA_FILEHANDLE);
+
+ offset = luaL_checkinteger(L, 2);
+ len = luaL_checkinteger(L, 3);
+
+#if defined(__linux__) && defined(_GNU_SOURCE)
+ if(fallocate(fileno(f), FALLOC_FL_KEEP_SIZE, offset, len) == 0)
+ {
+ lua_pushboolean(L, 1);
+ return 1;
+ }
+
+ if(errno != ENOSYS && errno != EOPNOTSUPP)
+ {
+ lua_pushnil(L);
+ lua_pushstring(L, strerror(errno));
+ return 2;
+ }
+#else
+#warning Only using posix_fallocate() fallback.
+#warning Linux fallocate() is strongly recommended if available: recompile with -D_GNU_SOURCE
+#warning Note that posix_fallocate() will still be used on filesystems that dont support fallocate()
+#endif
+
+ if(posix_fallocate(fileno(f), offset, len) == 0)
+ {
+ lua_pushboolean(L, 1);
+ return 1;
+ }
+ else
+ {
+ lua_pushnil(L);
+ lua_pushstring(L, strerror(errno));
+ /* posix_fallocate() can leave a bunch of NULs at the end, so we cut that
+ * this assumes that offset == length of the file */
+ ftruncate(fileno(f), offset);
+ return 2;
+ }
+}
+#endif
+
/* Register functions */
int luaopen_util_pposix(lua_State *L)
{ "uname", lc_uname },
+ { "setenv", lc_setenv },
+
+#ifdef WITH_MALLINFO
+ { "meminfo", lc_meminfo },
+#endif
+
+#if _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L || defined(_GNU_SOURCE)
+ { "fallocate", lc_fallocate },
+#endif
+
{ NULL, NULL }
};
lua_setfield(L, -2, "_VERSION");
return 1;
-};
+}
projects / prosody.git / blobdiff