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LD_ISCSI add lseek

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This commit is contained in:
Peter Lieven
2012-11-03 17:36:29 +01:00
committed by Ronnie Sahlberg
parent 01cd2ee42b
commit 59860df16a
1 changed files with 37 additions and 0 deletions
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37
src/ld_iscsi.c
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@@ -275,6 +275,37 @@ int __xstat(int ver, const char *path, struct stat *buf)
return __lxstat(ver, path, buf);
}
off_t (*real_lseek)(int fd, off_t offset, int whence);
off_t lseek(int fd, off_t offset, int whence) {
if (iscsi_fd_list[fd].is_iscsi == 1) {
off_t new_offset;
off_t size = iscsi_fd_list[fd].num_blocks*iscsi_fd_list[fd].block_size;
switch (whence) {
case SEEK_SET:
new_offset = offset;
break;
case SEEK_CUR:
new_offset = iscsi_fd_list[fd].offset+offset;
break;
case SEEK_END:
new_offset = size + offset;
break;
default:
errno = EINVAL;
return -1;
}
if (new_offset < 0 || new_offset > size) {
errno = EINVAL;
return -1;
}
iscsi_fd_list[fd].offset=new_offset;
return iscsi_fd_list[fd].offset;
}
return real_lseek(fd, offset, whence);
}
ssize_t (*real_read)(int fd, void *buf, size_t count);
ssize_t read(int fd, void *buf, size_t count)
@@ -503,6 +534,12 @@ static void __attribute__((constructor)) _init(void)
exit(10);
}
real_lseek = dlsym(RTLD_NEXT, "lseek");
if (real_lseek == NULL) {
LD_ISCSI_DPRINTF(0,"Failed to dlsym(lseek)");
exit(10);
}
real_read = dlsym(RTLD_NEXT, "read");
if (real_read == NULL) {
LD_ISCSI_DPRINTF(0,"Failed to dlsym(read)");