diff options
author | Jari Vetoniemi <mailroxas@gmail.com> | 2018-10-19 14:35:16 +0300 |
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committer | Jari Vetoniemi <mailroxas@gmail.com> | 2018-10-19 15:13:07 +0300 |
commit | 743fb001f3d381b14d48f3fdfc9ee648a7c0644c (patch) | |
tree | e46f65bfac59427b1389a4fb5d8c13ca34ed1c69 /src/io/io-uio.c | |
parent | 6cb8c44fef192f3f8e7164d9c3baccacc9db620c (diff) |
Refactor project, offer uio variant of region-rw
Diffstat (limited to 'src/io/io-uio.c')
-rw-r--r-- | src/io/io-uio.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/io/io-uio.c b/src/io/io-uio.c new file mode 100644 index 0000000..dd9f873 --- /dev/null +++ b/src/io/io-uio.c @@ -0,0 +1,41 @@ +#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; +} |