X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=util-src%2Fpposix.c;h=05303d99ae574a2e1ab990f64d06d206e19fd11a;hb=d631eea82c5144b9c2142b32affdb0ba4f878a43;hp=65f8b4ab0389ddbb766f167ad92f1728bd0ec32b;hpb=87322dba7bec7a32ace681561cf5a7f6fc0b5173;p=prosody.git

diff --git a/util-src/pposix.c b/util-src/pposix.c
index 65f8b4ab..05303d99 100644
--- a/util-src/pposix.c
+++ b/util-src/pposix.c
@@ -32,8 +32,14 @@
 #include <string.h>
 #include <errno.h>
 #include "lua.h"
+#include "lualib.h"
 #include "lauxlib.h"
 
+#include <fcntl.h>
+#if defined(_GNU_SOURCE)
+#include <linux/falloc.h>
+#endif
+
 #if (defined(_SVID_SOURCE) && !defined(WITHOUT_MALLINFO))
 	#include <malloc.h>
 	#define WITH_MALLINFO
@@ -83,6 +89,10 @@ 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())
@@ -642,6 +652,55 @@ int lc_meminfo(lua_State* L)
 }
 #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(_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)
@@ -679,6 +738,10 @@ int luaopen_util_pposix(lua_State *L)
 		{ "meminfo", lc_meminfo },
 #endif
 
+#if _XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L || defined(_GNU_SOURCE)
+		{ "fallocate", lc_fallocate },
+#endif
+
 		{ NULL, NULL }
 	};