prosody
e898c8fda986
util-src/pposix.c

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util-src/pposix.c @ 8012:e898c8fda986

util.pposix: Remove fallocate
author Kim Alvefur <zash@zash.se>
date Tue, 28 Feb 2017 13:26:05 +0100
parent 8010:49feb0da29e1
child 9028:d4c2a3060e7e
child 9278:8f9e18d4fe50
comparison
equal deleted inserted replaced
8011:f8ba814fe029 8012:e898c8fda986
11 /* 11 /*
12 * pposix.c 12 * pposix.c
13 * POSIX support functions for Lua 13 * POSIX support functions for Lua
14 */ 14 */
15 15
16 #define MODULE_VERSION "0.3.7" 16 #define MODULE_VERSION "0.4.0"
17 17
18 18
19 #if defined(__linux__) 19 #if defined(__linux__)
20 #define _GNU_SOURCE 20 #define _GNU_SOURCE
21 #else 21 #else
728 lua_setfield(L, -2, "returnable"); 728 lua_setfield(L, -2, "returnable");
729 return 1; 729 return 1;
730 } 730 }
731 #endif 731 #endif
732 732
733 /* File handle extraction blatantly stolen from
734 * https://github.com/rrthomas/luaposix/blob/master/lposix.c#L631
735 * */
736
737 int lc_fallocate(lua_State *L) {
738 int ret;
739 off_t offset, len;
740 FILE *f = *(FILE **) luaL_checkudata(L, 1, LUA_FILEHANDLE);
741
742 if(f == NULL) {
743 return luaL_error(L, "attempt to use a closed file");
744 }
745
746 offset = luaL_checkinteger(L, 2);
747 len = luaL_checkinteger(L, 3);
748
749 #if defined(__linux__)
750 errno = 0;
751 ret = fallocate(fileno(f), FALLOC_FL_KEEP_SIZE, offset, len);
752
753 if(ret == 0) {
754 lua_pushboolean(L, 1);
755 return 1;
756 }
757
758 /* Some old versions of Linux apparently use the return value instead of errno */
759 if(errno == 0) {
760 errno = ret;
761 }
762
763 if(errno != ENOSYS && errno != EOPNOTSUPP) {
764 lua_pushnil(L);
765 lua_pushstring(L, strerror(errno));
766 return 2;
767 }
768
769 #endif
770
771 ret = posix_fallocate(fileno(f), offset, len);
772
773 if(ret == 0) {
774 lua_pushboolean(L, 1);
775 return 1;
776 } else {
777 lua_pushnil(L);
778 lua_pushstring(L, strerror(ret));
779
780 /* posix_fallocate() can leave a bunch of NULs at the end, so we cut that
781 * this assumes that offset == length of the file */
782 if(ftruncate(fileno(f), offset) != 0) {
783 lua_pushstring(L, strerror(errno));
784 return 3;
785 }
786
787 return 2;
788 }
789 }
790
791 /* 733 /*
792 * Append some data to a file handle 734 * Append some data to a file handle
793 * Attempt to allocate space first 735 * Attempt to allocate space first
794 * Truncate to original size on failure 736 * Truncate to original size on failure
795 */ 737 */
887 829
888 #ifdef WITH_MALLINFO 830 #ifdef WITH_MALLINFO
889 { "meminfo", lc_meminfo }, 831 { "meminfo", lc_meminfo },
890 #endif 832 #endif
891 833
892 { "fallocate", lc_fallocate },
893 { "atomic_append", lc_atomic_append }, 834 { "atomic_append", lc_atomic_append },
894 835
895 { NULL, NULL } 836 { NULL, NULL }
896 }; 837 };
897 838