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util.pposix: Add remove_blocks() for deleting parts of files

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Allows implementing e.g. a FIFO

Will probably only work on some Linux file systems like ext4.
This commit is contained in:
Kim Alvefur 2023-06-07 05:07:03 +02:00
parent 50ae2083ca
commit 048b064fcd
2 changed files with 37 additions and 0 deletions
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36
util-src/pposix.c
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@ -802,6 +802,41 @@ static int lc_atomic_append(lua_State *L) {
return 3;
}
static int lc_remove_blocks(lua_State *L) {
#if defined(__linux__)
int err;
FILE *f = *(FILE **) luaL_checkudata(L, 1, LUA_FILEHANDLE);
off_t offset = (off_t)luaL_checkinteger(L, 2);
off_t length = (off_t)luaL_checkinteger(L, 3);
errno = 0;
if((err = fallocate(fileno(f), FALLOC_FL_COLLAPSE_RANGE, offset, length))) {
if(errno != 0) {
/* Some old versions of Linux apparently use the return value instead of errno */
err = errno;
}
switch(err) {
default: /* Other issues */
luaL_pushfail(L);
lua_pushstring(L, strerror(err));
lua_pushinteger(L, err);
return 3;
}
}
lua_pushboolean(L, err == 0);
return 1;
#else
luaL_pushfail(L);
lua_pushstring(L, strerror(EOPNOTSUPP));
lua_pushinteger(L, EOPNOTSUPP);
return 3;
#endif
}
static int lc_isatty(lua_State *L) {
FILE *f = *(FILE **) luaL_checkudata(L, 1, LUA_FILEHANDLE);
const int fd = fileno(f);
@ -847,6 +882,7 @@ int luaopen_prosody_util_pposix(lua_State *L) {
#endif
{ "atomic_append", lc_atomic_append },
{ "remove_blocks", lc_remove_blocks },
{ "isatty", lc_isatty },