#endif
#include "unify.h"
-#include <sys/stat.h>
+#include "util.h"
+
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
#define ENSC_WRAPPERS_IO 1
#include <wrappers.h>
+ //#define MMAP_BLOCKSIZE 0x10000000
+#define MMAP_BLOCKSIZE 0x4000
+
static inline bool
verifySource(int fd, struct stat const *exp_stat)
{
}
}
+static jmp_buf bus_error_restore;
+static volatile sig_atomic_t bus_error;
+
+static void
+handlerSIGBUS(int UNUSED num)
+{
+ bus_error = 1;
+ longjmp(bus_error_restore, 1);
+}
+
+static UNUSED bool
+copyMMap(int in_fd, int out_fd)
+{
+ off_t in_len = lseek(in_fd, 0, SEEK_END);
+ void volatile const *in_buf = 0;
+ void volatile *out_buf = 0;
+
+ volatile loff_t in_size = 0;
+ volatile loff_t out_size = 0;
+ volatile bool res = false;
+
+ if (in_len==-1) return false;
+ if (in_len>0 &&
+ (lseek(out_fd, in_len-1, SEEK_SET)==-1 ||
+ write(out_fd, "\0", 1)!=1)) // create sparse file
+ return false;
+
+ bus_error = 0;
+ if (setjmp(bus_error_restore)==0) {
+ off_t offset = 0;
+
+ while (offset < in_len) {
+ in_size = in_len - offset;
+ if (in_size > MMAP_BLOCKSIZE) in_size = MMAP_BLOCKSIZE;
+
+ in_buf = mmap(0, in_size, PROT_READ, MAP_SHARED, in_fd, offset);
+ if (in_buf==0) goto out;
+
+ out_size = in_size;
+ out_buf = mmap(0, out_size, PROT_WRITE, MAP_SHARED, out_fd, offset);
+ if (out_buf==0) goto out;
+
+ offset += in_size;
+ madvise(const_cast(void *)(in_buf), in_size, MADV_SEQUENTIAL);
+ madvise(out_buf, out_size, MADV_SEQUENTIAL);
+
+ memcpy(out_buf, in_buf, in_size);
+
+ munmap(const_cast(void *)(in_buf), in_size); in_buf = 0;
+ munmap(out_buf, out_size); out_buf = 0;
+ }
+
+ res = true;
+ }
+
+ out:
+ if (in_buf!=0) munmap(const_cast(void *)(in_buf), in_size);
+ if (out_buf!=0) munmap(out_buf, out_size);
+
+ return res;
+}
+
static inline bool
copyReg(char const *src, struct stat const *src_stat,
char const *dst)
if (in_fd==-1 || out_fd==-1 ||
!verifySource(in_fd, src_stat)) goto err;
+#if 0
for (;;) {
char buf[2048];
ssize_t l = read(in_fd, buf, sizeof buf);
}
res = true;
-
+#else
+ void (*old_handler)(int) = signal(SIGBUS, handlerSIGBUS);
+
+ res = copyMMap(in_fd, out_fd);
+
+ signal(SIGBUS, old_handler);
+#endif
+
err:
if (out_fd!=-1 && close(out_fd)==-1) res=false;
if (in_fd!=-1 && close(in_fd)==-1) res=false;