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#include "io.h"
#include <stdint.h>
#include <err.h>
#include <sys/uio.h>
static size_t
io_uio_do(const struct io *io, const void *ptr, const size_t offset, const size_t size, ssize_t (*iofun)(pid_t, const struct iovec*, unsigned long, const struct iovec*, unsigned long, unsigned long))
{
const struct iovec lio = { .iov_base = (void*)ptr, .iov_len = size };
const struct iovec rio = { .iov_base = (void*)(intptr_t)offset, .iov_len = size };
return iofun(io->pid, &lio, 1, &rio, 1, 0);
}
static size_t
io_uio_write(const struct io *io, const void *ptr, const size_t offset, const size_t size)
{
const size_t ret = io_uio_do(io, ptr, offset, size, process_vm_writev);
if (ret == (size_t)-1)
warn("process_vm_writev(%u)", io->pid);
return (ret == (size_t)-1 ? 0 : ret);
}
static size_t
io_uio_read(const struct io *io, void *ptr, const size_t offset, const size_t size)
{
const size_t ret = io_uio_do(io, ptr, offset, size, process_vm_readv);
if (ret == (size_t)-1)
warn("process_vm_readv(%u)", io->pid);
return (ret == (size_t)-1 ? 0 : ret);
}
bool
io_uio_init(struct io *io, const pid_t pid)
{
*io = (struct io){ .pid = pid, .read = io_uio_read, .write = io_uio_write };
return true;
}
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