void* read_child_data_checked(struct context *ctx, ssize_t size, uintptr_t addr, ssize_t *read_bytes)
{
//assert(check_if_mapped(ctx, addr, addr + size));
void *buf = sys_malloc(size);
/* if pread fails: do the following: echo 0 > /proc/sys/kernel/yama/ptrace_scope */
*read_bytes = checked_pread(ctx,buf,size,addr);
return buf;
}
void refill()
{
size32_t left = remaining();
memmove(buffer,ptr,left);
size32_t rd=bufSize-left;
if (endpos-nextbufpos<(offset_t)rd)
rd = (size32_t)(endpos-nextbufpos);
if (rd)
rd = checked_pread(fh, buffer+left, rd, nextbufpos);
nextbufpos += rd;
bytesInBuffer = left+rd;
ptr = buffer;
}
void* read_child_data(struct context *ctx, ssize_t size, uintptr_t addr)
{
void *buf = sys_malloc(size);
/* if pread fails: do the following: echo 0 > /proc/sys/kernel/yama/ptrace_scope */
ssize_t read_bytes = checked_pread(ctx,buf,size,addr);
if (read_bytes != size) {
free(buf);
buf = read_child_data_tid(ctx->child_tid,size,addr);
printf("reading from: %x demanded: %u read %u event: %d\n", addr, size, read_bytes, ctx->event);
perror("warning: reading from child process: ");
printf("try the following: echo 0 > /proc/sys/kernel/yama/ptrace_scope\n");
sleep(5);
}
return buf;
}