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libaio.h
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/* /usr/include/libaio.h * * Copyright 2000,2001,2002 Red Hat, Inc. * * Written by Benjamin LaHaise <bcrl@redhat.com> * * libaio Linux async I/O interface * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef __LIBAIO_H #define __LIBAIO_H #ifdef __cplusplus extern "C" { #endif #include <sys/types.h> #include <string.h> struct timespec; struct sockaddr; struct iovec; typedef struct io_context *io_context_t; typedef enum io_iocb_cmd { IO_CMD_PREAD = 0, IO_CMD_PWRITE = 1, IO_CMD_FSYNC = 2, IO_CMD_FDSYNC = 3, IO_CMD_POLL = 5, /* Never implemented in mainline, see io_prep_poll */ IO_CMD_NOOP = 6, IO_CMD_PREADV = 7, IO_CMD_PWRITEV = 8, } io_iocb_cmd_t; #if defined(__i386__) /* little endian, 32 bits */ #define PADDED(x, y) x; unsigned y #define PADDEDptr(x, y) x; unsigned y #define PADDEDul(x, y) unsigned long x; unsigned y #elif defined(__ia64__) || defined(__x86_64__) || defined(__alpha__) #define PADDED(x, y) x, y #define PADDEDptr(x, y) x #define PADDEDul(x, y) unsigned long x #elif defined(__powerpc64__) /* big endian, 64 bits */ #define PADDED(x, y) unsigned y; x #define PADDEDptr(x,y) x #define PADDEDul(x, y) unsigned long x #elif defined(__PPC__) /* big endian, 32 bits */ #define PADDED(x, y) unsigned y; x #define PADDEDptr(x, y) unsigned y; x #define PADDEDul(x, y) unsigned y; unsigned long x #elif defined(__s390x__) /* big endian, 64 bits */ #define PADDED(x, y) unsigned y; x #define PADDEDptr(x,y) x #define PADDEDul(x, y) unsigned long x #elif defined(__s390__) /* big endian, 32 bits */ #define PADDED(x, y) unsigned y; x #define PADDEDptr(x, y) unsigned y; x #define PADDEDul(x, y) unsigned y; unsigned long x #elif defined(__arm__) # if defined (__ARMEB__) /* big endian, 32 bits */ #define PADDED(x, y) unsigned y; x #define PADDEDptr(x, y) unsigned y; x #define PADDEDul(x, y) unsigned y; unsigned long x # else /* little endian, 32 bits */ #define PADDED(x, y) x; unsigned y #define PADDEDptr(x, y) x; unsigned y #define PADDEDul(x, y) unsigned long x; unsigned y # endif #elif defined(__aarch64__) # if defined (__AARCH64EB__) /* big endian, 64 bits */ #define PADDED(x, y) unsigned y; x #define PADDEDptr(x,y) x #define PADDEDul(x, y) unsigned long x # elif defined(__AARCH64EL__) /* little endian, 64 bits */ #define PADDED(x, y) x, y #define PADDEDptr(x, y) x #define PADDEDul(x, y) unsigned long x # endif #else #error endian? #endif struct io_iocb_poll { PADDED(int events, __pad1); }; /* result code is the set of result flags or -'ve errno */ struct io_iocb_sockaddr { struct sockaddr *addr; int len; }; /* result code is the length of the sockaddr, or -'ve errno */ struct io_iocb_common { PADDEDptr(void *buf, __pad1); PADDEDul(nbytes, __pad2); long long offset; long long __pad3; unsigned flags; unsigned resfd; }; /* result code is the amount read or -'ve errno */ struct io_iocb_vector { const struct iovec *vec; int nr; long long offset; }; /* result code is the amount read or -'ve errno */ struct iocb { PADDEDptr(void *data, __pad1); /* Return in the io completion event */ PADDED(unsigned key, __pad2); /* For use in identifying io requests */ short aio_lio_opcode; short aio_reqprio; int aio_fildes; union { struct io_iocb_common c; struct io_iocb_vector v; struct io_iocb_poll poll; struct io_iocb_sockaddr saddr; } u; }; struct io_event { PADDEDptr(void *data, __pad1); PADDEDptr(struct iocb *obj, __pad2); PADDEDul(res, __pad3); PADDEDul(res2, __pad4); }; #undef PADDED #undef PADDEDptr #undef PADDEDul typedef void (*io_callback_t)(io_context_t ctx, struct iocb *iocb, long res, long res2); /* library wrappers */ extern int io_queue_init(int maxevents, io_context_t *ctxp); /*extern int io_queue_grow(io_context_t ctx, int new_maxevents);*/ extern int io_queue_release(io_context_t ctx); /*extern int io_queue_wait(io_context_t ctx, struct timespec *timeout);*/ extern int io_queue_run(io_context_t ctx); /* Actual syscalls */ extern int io_setup(int maxevents, io_context_t *ctxp); extern int io_destroy(io_context_t ctx); extern int io_submit(io_context_t ctx, long nr, struct iocb *ios[]); extern int io_cancel(io_context_t ctx, struct iocb *iocb, struct io_event *evt); extern int io_getevents(io_context_t ctx_id, long min_nr, long nr, struct io_event *events, struct timespec *timeout); static inline void io_set_callback(struct iocb *iocb, io_callback_t cb) { iocb->data = (void *)cb; } static inline void io_prep_pread(struct iocb *iocb, int fd, void *buf, size_t count, long long offset) { memset(iocb, 0, sizeof(*iocb)); iocb->aio_fildes = fd; iocb->aio_lio_opcode = IO_CMD_PREAD; iocb->aio_reqprio = 0; iocb->u.c.buf = buf; iocb->u.c.nbytes = count; iocb->u.c.offset = offset; } static inline void io_prep_pwrite(struct iocb *iocb, int fd, void *buf, size_t count, long long offset) { memset(iocb, 0, sizeof(*iocb)); iocb->aio_fildes = fd; iocb->aio_lio_opcode = IO_CMD_PWRITE; iocb->aio_reqprio = 0; iocb->u.c.buf = buf; iocb->u.c.nbytes = count; iocb->u.c.offset = offset; } static inline void io_prep_preadv(struct iocb *iocb, int fd, const struct iovec *iov, int iovcnt, long long offset) { memset(iocb, 0, sizeof(*iocb)); iocb->aio_fildes = fd; iocb->aio_lio_opcode = IO_CMD_PREADV; iocb->aio_reqprio = 0; iocb->u.c.buf = (void *)iov; iocb->u.c.nbytes = iovcnt; iocb->u.c.offset = offset; } static inline void io_prep_pwritev(struct iocb *iocb, int fd, const struct iovec *iov, int iovcnt, long long offset) { memset(iocb, 0, sizeof(*iocb)); iocb->aio_fildes = fd; iocb->aio_lio_opcode = IO_CMD_PWRITEV; iocb->aio_reqprio = 0; iocb->u.c.buf = (void *)iov; iocb->u.c.nbytes = iovcnt; iocb->u.c.offset = offset; } /* Jeff Moyer says this was implemented in Red Hat AS2.1 and RHEL3. * AFAICT, it was never in mainline, and should not be used. --RR */ static inline void io_prep_poll(struct iocb *iocb, int fd, int events) { memset(iocb, 0, sizeof(*iocb)); iocb->aio_fildes = fd; iocb->aio_lio_opcode = IO_CMD_POLL; iocb->aio_reqprio = 0; iocb->u.poll.events = events; } static inline int io_poll(io_context_t ctx, struct iocb *iocb, io_callback_t cb, int fd, int events) { io_prep_poll(iocb, fd, events); io_set_callback(iocb, cb); return io_submit(ctx, 1, &iocb); } static inline void io_prep_fsync(struct iocb *iocb, int fd) { memset(iocb, 0, sizeof(*iocb)); iocb->aio_fildes = fd; iocb->aio_lio_opcode = IO_CMD_FSYNC; iocb->aio_reqprio = 0; } static inline int io_fsync(io_context_t ctx, struct iocb *iocb, io_callback_t cb, int fd) { io_prep_fsync(iocb, fd); io_set_callback(iocb, cb); return io_submit(ctx, 1, &iocb); } static inline void io_prep_fdsync(struct iocb *iocb, int fd) { memset(iocb, 0, sizeof(*iocb)); iocb->aio_fildes = fd; iocb->aio_lio_opcode = IO_CMD_FDSYNC; iocb->aio_reqprio = 0; } static inline int io_fdsync(io_context_t ctx, struct iocb *iocb, io_callback_t cb, int fd) { io_prep_fdsync(iocb, fd); io_set_callback(iocb, cb); return io_submit(ctx, 1, &iocb); } static inline void io_set_eventfd(struct iocb *iocb, int eventfd) { iocb->u.c.flags |= (1 << 0) /* IOCB_FLAG_RESFD */; iocb->u.c.resfd = eventfd; } #ifdef __cplusplus } #endif #endif /* __LIBAIO_H */
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