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/******************************************************/
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/* tpax: a topological pax implementation */
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/* Copyright (C) 2020 Z. Gilboa */
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/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
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/******************************************************/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include <tpax/tpax.h>
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#include <tpax/tpax_specs.h>
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#include "tpax_driver_impl.h"
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#include "tpax_errinfo_impl.h"
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#ifndef ssizeof
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#define ssizeof(x) (ssize_t)(sizeof(x))
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#endif
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int tpax_file_create_memory_snapshot(
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const struct tpax_driver_ctx * dctx,
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int fdat,
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const char * path,
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const struct stat * srcst,
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void * addr)
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{
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int fd;
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char * ch;
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char * cap;
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ssize_t nread;
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struct stat dstst;
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/* record errors */
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tpax_driver_set_ectx(
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dctx,0,path);
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/* memory snapshot internal limit */
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if (srcst->st_size >= 0x80000000)
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return TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_REGION_SIZE);
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/* open */
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if ((fd = openat(fdat,path,O_CLOEXEC|O_NOCTTY|O_NOFOLLOW,0)) < 0)
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return TPAX_SYSTEM_ERROR(dctx);
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/* stat compare */
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if ((fstat(fd,&dstst)) < 0) {
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close(fd);
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return TPAX_SYSTEM_ERROR(dctx);
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} else if (tpax_stat_compare(srcst,&dstst)) {
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close(fd);
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return TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_FILE_CHANGED);
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}
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/* read loop */
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ch = addr;
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cap = &ch[srcst->st_size];
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while (ch < cap) {
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nread = read(fd,ch,cap-ch);
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while ((nread < 0) && (errno == EINTR))
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nread = read(fd,ch,cap-ch);
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if (nread < 0) {
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close(fd);
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return TPAX_SYSTEM_ERROR(dctx);
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} else if (nread == 0) {
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close(fd);
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return TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_FLOW_ERROR);
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} else {
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ch += nread;
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}
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}
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/* stat compare */
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if ((fstat(fd,&dstst)) < 0) {
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close(fd);
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return TPAX_SYSTEM_ERROR(dctx);
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} else if (tpax_stat_compare(srcst,&dstst)) {
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close(fd);
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return TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_FILE_CHANGED);
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}
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/* yay */
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close(fd);
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return 0;
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}
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