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https://github.com/libretro/RetroArch
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Style nits
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@ -11,7 +11,21 @@
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#include <sys/syscall.h>
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#include <linux/aio_abi.h>
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/* there's also a Unix AIO thingy, but it's not in glibc and we don't want more dependencies */
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struct nbio_t
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{
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int fd;
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bool busy;
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aio_context_t ctx;
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struct iocb cb;
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void* ptr;
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size_t len;
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};
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/* there's also a Unix AIO thingy, but it's not in glibc
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* and we don't want more dependencies */
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static int io_setup(unsigned nr, aio_context_t * ctxp)
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{
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@ -39,28 +53,15 @@ static int io_getevents(aio_context_t ctx, long min_nr, long nr,
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return syscall(__NR_io_getevents, ctx, min_nr, nr, events, timeout);
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}
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struct nbio_t
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{
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int fd;
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bool busy;
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aio_context_t ctx;
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struct iocb cb;
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void* ptr;
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size_t len;
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};
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struct nbio_t* nbio_open(const char * filename, unsigned mode)
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{
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static const int o_flags[] = { O_RDONLY, O_RDWR|O_CREAT|O_TRUNC, O_RDWR, O_RDONLY, O_RDWR|O_CREAT|O_TRUNC };
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aio_context_t ctx = 0;
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struct nbio_t* handle;
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int fd;
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fd = open(filename, o_flags[mode]|O_CLOEXEC, 0644);
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if (fd < 0) return NULL;
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struct nbio_t* handle = NULL;
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int fd = open(filename, o_flags[mode]|O_CLOEXEC, 0644);
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if (fd < 0)
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return NULL;
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if (io_setup(128, &ctx) < 0)
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{
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@ -74,6 +75,7 @@ struct nbio_t* nbio_open(const char * filename, unsigned mode)
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handle->len = lseek(fd, 0, SEEK_END);
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handle->ptr = malloc(handle->len);
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handle->busy = false;
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return handle;
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}
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@ -114,10 +116,8 @@ bool nbio_iterate(struct nbio_t* handle)
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{
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struct io_event ev;
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if (io_getevents(handle->ctx, 0, 1, &ev, NULL) == 1)
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{
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handle->busy = false;
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}
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}
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return !handle->busy;
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}
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@ -125,7 +125,8 @@ void nbio_resize(struct nbio_t* handle, size_t len)
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{
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if (len < handle->len)
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{
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/* this works perfectly fine if this check is removed, but it won't work on other nbio implementations */
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/* this works perfectly fine if this check is removed, but it
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* won't work on other nbio implementations */
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/* therefore, it's blocked so nobody accidentally relies on it */
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puts("ERROR - attempted file shrink operation, not implemented");
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abort();
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@ -133,7 +134,8 @@ void nbio_resize(struct nbio_t* handle, size_t len)
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if (ftruncate(handle->fd, len) != 0)
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{
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puts("ERROR - couldn't resize file (ftruncate)");
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abort(); /* this one returns void and I can't find any other way for it to report failure */
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abort(); /* this one returns void and I can't find any other way
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for it to report failure */
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}
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handle->ptr = realloc(handle->ptr, len);
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handle->len = len;
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@ -141,13 +143,20 @@ void nbio_resize(struct nbio_t* handle, size_t len)
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void* nbio_get_ptr(struct nbio_t* handle, size_t* len)
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{
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if (len) *len = handle->len;
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if (!handle->busy) return handle->ptr;
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else return NULL;
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if (!handle)
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return NULL;
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if (len)
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*len = handle->len;
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if (!handle->busy)
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return handle->ptr;
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return NULL;
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}
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void nbio_cancel(struct nbio_t* handle)
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{
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if (!handle)
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return;
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if (handle->busy)
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{
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struct io_event ev;
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@ -158,6 +167,9 @@ void nbio_cancel(struct nbio_t* handle)
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void nbio_free(struct nbio_t* handle)
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{
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if (!handle)
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return;
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io_destroy(handle->ctx);
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close(handle->fd);
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free(handle->ptr);
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