static int rpmidxMap(rpmidxdb idxdb)
{
struct stat stb;
if (idxdb->xdb) {
if (rpmxdbMapBlob(idxdb->xdb, idxdb->xdbid, idxdb->rdonly ? O_RDONLY : O_RDWR, mapcb, idxdb))
return RPMRC_FAIL;
if (idxdb->file_size < 4096) {
rpmxdbUnmapBlob(idxdb->xdb, idxdb->xdbid);
return RPMRC_FAIL;
}
} else {
size_t size;
void *mapped;
if (fstat(idxdb->fd, &stb))
return RPMRC_FAIL;
size = stb.st_size;
if (size < 4096)
return RPMRC_FAIL;
/* round up for mmap */
size = (size + idxdb->pagesize - 1) & ~(idxdb->pagesize - 1);
mapped = mmap(0, size, idxdb->rdonly ? PROT_READ : PROT_READ | PROT_WRITE, MAP_SHARED, idxdb->fd, 0);
if (mapped == MAP_FAILED)
return RPMRC_FAIL;
set_mapped(idxdb, mapped, (unsigned int)stb.st_size);
}
return RPMRC_OK;
}
static void rpmidxUnmap(rpmidxdb idxdb)
{
if (!idxdb->head_mapped)
return;
if (idxdb->xdb) {
rpmxdbUnmapBlob(idxdb->xdb, idxdb->xdbid);
} else {
size_t size = idxdb->file_size;
/* round up for munmap */
size = (size + idxdb->pagesize - 1) & ~(idxdb->pagesize - 1);
munmap(idxdb->head_mapped, size);
set_mapped(idxdb, 0, 0);
}
}
/* XDB callbacks */
static void mapcb(rpmxdb xdb, void *data, void *newaddr, size_t newsize) {
set_mapped((rpmidxdb)data, newaddr, (unsigned int)newsize);
}
void mapped_write(int wid, const char *buf)
{
set_mapped(wid, !strcmp(buf, "true\n"));
}
