diff --git a/lib/libsys/Makefile.sys b/lib/libsys/Makefile.sys index f88a107f9eb8..b45aa3cf1aaf 100644 --- a/lib/libsys/Makefile.sys +++ b/lib/libsys/Makefile.sys @@ -1,545 +1,547 @@ # sys sources .PATH: ${LIBSYS_SRCTOP}/${LIBC_ARCH} ${LIBSYS_SRCTOP} # Include the generated makefile containing the *complete* list # of syscall names in MIASM. .include "${SRCTOP}/sys/sys/syscall.mk" # Include machine dependent definitions. # # MDASM names override the default syscall names in MIASM. # NOASM will prevent the default syscall code from being generated. # PSEUDO generates _() and __sys_() symbols, but not (). # # While historically machine dependent, all architectures have the following # declarations in common: # NOASM= exit.o \ getlogin.o \ yield.o PSEUDO= _exit.o \ _getlogin.o .include "${LIBSYS_SRCTOP}/${LIBC_ARCH}/Makefile.sys" .if ${LIBC_ARCH} == "i386" || ${LIBC_ARCH} == "amd64" .include "${LIBSYS_SRCTOP}/x86/Makefile.sys" .endif SRCS+= clock_gettime.c gettimeofday.c __vdso_gettimeofday.c NOASM+= clock_gettime.o gettimeofday.o PSEUDO+= _clock_gettime.o _gettimeofday.o # Sources common to both syscall interfaces: SRCS+= \ __error.c \ __getosreldate.c \ _once_stub.c \ getpagesize.c \ getpagesizes.c \ interposing_table.c SRCS+= getdents.c lstat.c mknod.c stat.c SRCS+= creat.c SRCS+= lockf.c sleep.c usleep.c wait.c wait3.c waitpid.c waitid.c SRCS+= recv.c recvmmsg.c send.c sendmmsg.c NOASM+= sched_getcpu.o PSEUDO+= _sched_getcpu.o SRCS+= auxv.c SRCS+= brk.c SRCS+= closefrom.c SRCS+= pipe.c SRCS+= shm_open.c SRCS+= vadvise.c SRCS+= POSIX2x_Fork.c SRCS+= compat-stub.c INTERPOSED = \ accept \ accept4 \ aio_suspend \ clock_nanosleep \ close \ connect \ fcntl \ fdatasync \ fsync \ fork \ kevent \ msync \ nanosleep \ open \ openat \ pdfork \ poll \ ppoll \ pselect \ ptrace \ read \ readv \ recvfrom \ recvmsg \ select \ sendmsg \ sendto \ setcontext \ sigaction \ sigprocmask \ sigsuspend \ sigtimedwait \ sigwait \ sigwaitinfo \ swapcontext \ wait4 \ wait6 \ write \ writev SRCS+= ${INTERPOSED:S/$/.c/} NOASM+= ${INTERPOSED:S/$/.o/} PSEUDO+= ${INTERPOSED:C/^.*$/_&.o/} # Add machine dependent asm sources: SRCS+=${MDASM} # Look though the complete list of syscalls (MIASM) for names that are # not defined with machine dependent implementations (MDASM) and are # not declared for no generation of default code (NOASM). Add each # syscall that satisfies these conditions to the ASM list. .for _asm in ${MIASM} .if !${MDASM:R:M${_asm:R}} && !${NOASM:R:M${_asm:R}} ASM+=$(_asm) .endif .endfor SASM= ${ASM:S/.o/.S/} SPSEUDO= ${PSEUDO:S/.o/.S/} SRCS+= ${SASM} ${SPSEUDO} SYM_MAPS+= ${LIBSYS_SRCTOP}/syscalls.map SYM_MAPS+= ${LIBSYS_SRCTOP}/Symbol.sys.map .if exists(${LIBSYS_SRCTOP}/${LIBC_ARCH}/Symbol.sys.map) SYM_MAPS+= ${LIBSYS_SRCTOP}/${LIBC_ARCH}/Symbol.sys.map .endif # Generated files CLEANFILES+= ${SASM} ${SPSEUDO} .if ${MACHINE_CPUARCH} == "amd64" || ${MACHINE_CPUARCH} == "i386" || \ ${MACHINE_CPUARCH} == "powerpc" || ${MACHINE_CPUARCH} == "arm" NOTE_GNU_STACK='\t.section .note.GNU-stack,"",%%progbits\n' .else NOTE_GNU_STACK='' .endif .if ${MACHINE_CPUARCH} == "aarch64" FEATURE_NOTE='\#include \nGNU_PROPERTY_AARCH64_FEATURE_1_NOTE(GNU_PROPERTY_AARCH64_FEATURE_1_VAL)' .else FEATURE_NOTE='' .endif ${SASM}: printf '/* %sgenerated by libc/sys/Makefile.inc */\n' @ > ${.TARGET} printf '#include "compat.h"\n' >> ${.TARGET} printf '#include "SYS.h"\nRSYSCALL(${.PREFIX})\n' >> ${.TARGET} printf ${NOTE_GNU_STACK} >>${.TARGET} printf ${FEATURE_NOTE} >> ${.TARGET} ${SPSEUDO}: printf '/* %sgenerated by libc/sys/Makefile.inc */\n' @ > ${.TARGET} printf '#include "compat.h"\n' >> ${.TARGET} printf '#include "SYS.h"\nPSEUDO(${.PREFIX:S/_//})\n' \ >> ${.TARGET} printf ${NOTE_GNU_STACK} >>${.TARGET} printf ${FEATURE_NOTE} >> ${.TARGET} .if ${LIB} == "sys" MAN+= abort2.2 \ accept.2 \ access.2 \ acct.2 \ adjtime.2 \ aio_cancel.2 \ aio_error.2 \ aio_fsync.2 \ aio_mlock.2 \ aio_read.2 \ aio_return.2 \ aio_suspend.2 \ aio_waitcomplete.2 \ aio_write.2 \ auxv.3 \ bind.2 \ bindat.2 \ brk.2 \ cap_enter.2 \ cap_fcntls_limit.2 \ cap_ioctls_limit.2 \ cap_rights_limit.2 \ chdir.2 \ chflags.2 \ chmod.2 \ chown.2 \ chroot.2 \ clock_gettime.2 \ close.2 \ closefrom.2 \ connect.2 \ connectat.2 \ copy_file_range.2 \ cpuset.2 \ cpuset_getaffinity.2 \ cpuset_getdomain.2 \ creat.2 \ dup.2 \ eventfd.2 \ execve.2 \ _exit.2 \ extattr_get_file.2 \ fcntl.2 \ ffclock.2 \ fhlink.2 \ fhopen.2 \ fhreadlink.2 \ flock.2 \ fork.2 \ fspacectl.2 \ fsync.2 \ getdirentries.2 \ getdtablesize.2 \ getfh.2 \ getfsstat.2 \ getgid.2 \ getgroups.2 \ getitimer.2 \ getlogin.2 \ getloginclass.2 \ getpeername.2 \ getpgrp.2 \ getpid.2 \ getpriority.2 \ getrandom.2 \ getrlimit.2 \ getrusage.2 \ getsid.2 \ getsockname.2 \ getsockopt.2 \ gettimeofday.2 \ getuid.2 \ intro.2 \ ioctl.2 \ issetugid.2 \ jail.2 \ kcmp.2 \ kenv.2 \ kill.2 \ kldfind.2 \ kldfirstmod.2 \ kldload.2 \ kldnext.2 \ kldstat.2 \ kldsym.2 \ kldunload.2 \ kqueue.2 \ ktrace.2 \ link.2 \ lio_listio.2 \ listen.2 \ lseek.2 \ madvise.2 \ mincore.2 \ minherit.2 \ mkdir.2 \ mkfifo.2 \ mknod.2 \ mlock.2 \ mlockall.2 \ mmap.2 \ modfind.2 \ modnext.2 \ modstat.2 \ mount.2 \ mprotect.2 \ mq_close.2 \ mq_getattr.2 \ mq_notify.2 \ mq_open.2 \ mq_receive.2 \ mq_send.2 \ mq_setattr.2 \ mq_unlink.2 \ msgctl.2 \ msgget.2 \ msgrcv.2 \ msgsnd.2 \ msync.2 \ munmap.2 \ nanosleep.2 \ nfssvc.2 \ ntp_adjtime.2 \ open.2 \ pathconf.2 \ pdfork.2 \ pipe.2 \ poll.2 \ posix_fadvise.2 \ posix_fallocate.2 \ posix_openpt.2 \ procctl.2 \ profil.2 \ pselect.2 \ ptrace.2 \ quotactl.2 \ rctl_add_rule.2 \ read.2 \ readlink.2 \ reboot.2 \ recv.2 \ rename.2 \ revoke.2 \ rfork.2 \ rmdir.2 \ rtprio.2 \ sched_get_priority_max.2 \ sched_setparam.2 \ sched_setscheduler.2 \ sched_yield.2 \ sctp_generic_recvmsg.2 \ sctp_generic_sendmsg.2 \ sctp_peeloff.2 \ select.2 \ semctl.2 \ semget.2 \ semop.2 \ send.2 \ setfib.2 \ sendfile.2 \ setgroups.2 \ setpgid.2 \ setregid.2 \ setresuid.2 \ setreuid.2 \ setsid.2 \ setuid.2 \ shmat.2 \ shmctl.2 \ shmget.2 \ shm_open.2 \ shutdown.2 \ sigaction.2 \ sigaltstack.2 \ sigfastblock.2 \ sigpending.2 \ sigprocmask.2 \ sigqueue.2 \ sigreturn.2 \ sigstack.2 \ sigsuspend.2 \ sigwait.2 \ sigwaitinfo.2 \ socket.2 \ socketpair.2 \ stat.2 \ statfs.2 \ swapon.2 \ symlink.2 \ sync.2 \ sysarch.2 \ syscall.2 \ thr_exit.2 \ thr_kill.2 \ thr_new.2 \ thr_self.2 \ thr_set_name.2 \ thr_suspend.2 \ thr_wake.2 \ timer_create.2 \ timer_delete.2 \ timer_settime.2 \ timerfd.2 \ truncate.2 \ umask.2 \ undelete.2 \ unlink.2 \ utimensat.2 \ utimes.2 \ utrace.2 \ uuidgen.2 \ vfork.2 \ wait.2 \ write.2 \ _umtx_op.2 MAN+= \ getpagesize.3 \ getpagesizes.3 \ lockf.3 \ rfork_thread.3 \ sleep.3 \ usleep.3 -MLINKS+=aio_read.2 aio_readv.2 -MLINKS+=aio_write.2 aio_writev.2 +MLINKS+=aio_read.2 aio_readv.2 \ + aio_read.2 aio_read2.2 +MLINKS+=aio_write.2 aio_writev.2 \ + aio_write.2 aio_write2.2 MLINKS+=accept.2 accept4.2 MLINKS+=access.2 eaccess.2 \ access.2 faccessat.2 MLINKS+=auxv.3 elf_aux_info.3 MLINKS+=brk.2 sbrk.2 MLINKS+=cap_enter.2 cap_getmode.2 MLINKS+=cap_fcntls_limit.2 cap_fcntls_get.2 MLINKS+=cap_ioctls_limit.2 cap_ioctls_get.2 MLINKS+=chdir.2 fchdir.2 MLINKS+=chflags.2 chflagsat.2 \ chflags.2 fchflags.2 \ chflags.2 lchflags.2 MLINKS+=chmod.2 fchmod.2 \ chmod.2 fchmodat.2 \ chmod.2 lchmod.2 MLINKS+=chown.2 fchown.2 \ chown.2 fchownat.2 \ chown.2 lchown.2 MLINKS+=clock_gettime.2 clock_getres.2 \ clock_gettime.2 clock_settime.2 MLINKS+=closefrom.2 close_range.2 MLINKS+=nanosleep.2 clock_nanosleep.2 MLINKS+=cpuset.2 cpuset_getid.2 \ cpuset.2 cpuset_setid.2 MLINKS+=cpuset_getaffinity.2 cpuset_setaffinity.2 MLINKS+=cpuset_getdomain.2 cpuset_setdomain.2 MLINKS+=dup.2 dup2.2 MLINKS+=eventfd.2 eventfd_read.3 \ eventfd.2 eventfd_write.3 MLINKS+=execve.2 fexecve.2 MLINKS+=extattr_get_file.2 extattr.2 \ extattr_get_file.2 extattr_delete_fd.2 \ extattr_get_file.2 extattr_delete_file.2 \ extattr_get_file.2 extattr_delete_link.2 \ extattr_get_file.2 extattr_get_fd.2 \ extattr_get_file.2 extattr_get_link.2 \ extattr_get_file.2 extattr_list_fd.2 \ extattr_get_file.2 extattr_list_file.2 \ extattr_get_file.2 extattr_list_link.2 \ extattr_get_file.2 extattr_set_fd.2 \ extattr_get_file.2 extattr_set_file.2 \ extattr_get_file.2 extattr_set_link.2 MLINKS+=ffclock.2 ffclock_getcounter.2 \ ffclock.2 ffclock_getestimate.2 \ ffclock.2 ffclock_setestimate.2 MLINKS+=fhlink.2 fhlinkat.2 MLINKS+=fhopen.2 fhstat.2 fhopen.2 fhstatfs.2 MLINKS+=fork.2 _Fork.2 MLINKS+=fsync.2 fdatasync.2 MLINKS+=getdirentries.2 getdents.2 MLINKS+=getfh.2 lgetfh.2 \ getfh.2 getfhat.2 MLINKS+=getgid.2 getegid.2 MLINKS+=getitimer.2 setitimer.2 MLINKS+=getlogin.2 getlogin_r.3 MLINKS+=getlogin.2 setlogin.2 MLINKS+=getloginclass.2 setloginclass.2 MLINKS+=getpgrp.2 getpgid.2 MLINKS+=getpid.2 getppid.2 MLINKS+=getpriority.2 setpriority.2 MLINKS+=getrlimit.2 setrlimit.2 MLINKS+=getsockopt.2 setsockopt.2 MLINKS+=gettimeofday.2 settimeofday.2 MLINKS+=getuid.2 geteuid.2 MLINKS+=intro.2 errno.2 MLINKS+=jail.2 jail_attach.2 \ jail.2 jail_get.2 \ jail.2 jail_remove.2 \ jail.2 jail_set.2 MLINKS+=kldunload.2 kldunloadf.2 MLINKS+=kqueue.2 kevent.2 \ kqueue.2 kqueuex.2 \ kqueue.2 EV_SET.3 MLINKS+=link.2 linkat.2 MLINKS+=madvise.2 posix_madvise.2 MLINKS+=mkdir.2 mkdirat.2 MLINKS+=mkfifo.2 mkfifoat.2 MLINKS+=mknod.2 mknodat.2 MLINKS+=mlock.2 munlock.2 MLINKS+=mlockall.2 munlockall.2 MLINKS+=modnext.2 modfnext.2 MLINKS+=mount.2 nmount.2 \ mount.2 unmount.2 MLINKS+=mq_receive.2 mq_timedreceive.2 MLINKS+=mq_send.2 mq_timedsend.2 MLINKS+=ntp_adjtime.2 ntp_gettime.2 MLINKS+=open.2 openat.2 MLINKS+=pathconf.2 fpathconf.2 MLINKS+=pathconf.2 lpathconf.2 MLINKS+=pdfork.2 pdgetpid.2\ pdfork.2 pdkill.2 MLINKS+=pipe.2 pipe2.2 MLINKS+=poll.2 ppoll.2 MLINKS+=rctl_add_rule.2 rctl_get_limits.2 \ rctl_add_rule.2 rctl_get_racct.2 \ rctl_add_rule.2 rctl_get_rules.2 \ rctl_add_rule.2 rctl_remove_rule.2 MLINKS+=read.2 pread.2 \ read.2 preadv.2 \ read.2 readv.2 MLINKS+=readlink.2 readlinkat.2 MLINKS+=recv.2 recvfrom.2 \ recv.2 recvmsg.2 MLINKS+=rename.2 renameat.2 MLINKS+=rtprio.2 rtprio_thread.2 MLINKS+=sched_get_priority_max.2 sched_get_priority_min.2 \ sched_get_priority_max.2 sched_rr_get_interval.2 MLINKS+=sched_setparam.2 sched_getparam.2 MLINKS+=sched_setscheduler.2 sched_getscheduler.2 MLINKS+=sctp_generic_sendmsg.2 sctp_generic_sendmsg_iov.2 MLINKS+=select.2 FD_CLR.3 \ select.2 FD_ISSET.3 \ select.2 FD_SET.3 \ select.2 FD_ZERO.3 MLINKS+=send.2 sendmsg.2 \ send.2 sendto.2 MLINKS+=setpgid.2 setpgrp.2 MLINKS+=setresuid.2 getresgid.2 \ setresuid.2 getresuid.2 \ setresuid.2 setresgid.2 MLINKS+=setuid.2 setegid.2 \ setuid.2 seteuid.2 \ setuid.2 setgid.2 MLINKS+=shmat.2 shmdt.2 MLINKS+=shm_open.2 memfd_create.3 \ shm_open.2 shm_create_largepage.3 \ shm_open.2 shm_unlink.2 \ shm_open.2 shm_rename.2 MLINKS+=sigwaitinfo.2 sigtimedwait.2 MLINKS+=stat.2 fstat.2 \ stat.2 fstatat.2 \ stat.2 lstat.2 MLINKS+=statfs.2 fstatfs.2 MLINKS+=swapon.2 swapoff.2 MLINKS+=symlink.2 symlinkat.2 MLINKS+=syscall.2 __syscall.2 MLINKS+=timer_settime.2 timer_getoverrun.2 \ timer_settime.2 timer_gettime.2 MLINKS+=timerfd.2 timerfd_create.2 \ timerfd.2 timerfd_gettime.2 \ timerfd.2 timerfd_settime.2 MLINKS+=thr_kill.2 thr_kill2.2 MLINKS+=truncate.2 ftruncate.2 MLINKS+=unlink.2 unlinkat.2 MLINKS+=unlink.2 funlinkat.2 MLINKS+=utimensat.2 futimens.2 MLINKS+=utimes.2 futimes.2 \ utimes.2 futimesat.2 \ utimes.2 lutimes.2 MLINKS+=wait.2 wait3.2 \ wait.2 wait4.2 \ wait.2 waitpid.2 \ wait.2 waitid.2 \ wait.2 wait6.2 MLINKS+=write.2 pwrite.2 \ write.2 pwritev.2 \ write.2 writev.2 .endif # ${LIB} == "sys" diff --git a/lib/libsys/aio_read.2 b/lib/libsys/aio_read.2 index 092315e70c91..3a9601754c06 100644 --- a/lib/libsys/aio_read.2 +++ b/lib/libsys/aio_read.2 @@ -1,247 +1,288 @@ .\" Copyright (c) 1998 Terry Lambert .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd November 15, 2023 +.Dd February 1, 2024 .Dt AIO_READ 2 .Os .Sh NAME .Nm aio_read , +.Nm aio_read2 , .Nm aio_readv .Nd asynchronous read from a file (REALTIME) .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In aio.h .Ft int .Fn aio_read "struct aiocb *iocb" +.Ft int +.Fn aio_read2 "struct aiocb *iocb" "int flags" .In sys/uio.h .Ft int .Fn aio_readv "struct aiocb *iocb" .Sh DESCRIPTION The -.Fn aio_read +.Fn aio_read , +.Fn aio_read2 and .Fn aio_readv system calls allow the calling process to read from the descriptor -.Fa iocb->aio_fildes -beginning at the offset +.Fa iocb->aio_fildes . +The syscalls return immediately after the read request has +been enqueued to the descriptor; the read may or may not have +completed at the time the call returns. +.Pp +For the +.Fn aio_read +and +.Fn aio_readv +calls, the read begins at the offset .Fa iocb->aio_offset . +.Pp +The .Fn aio_read -will read +call will read .Fa iocb->aio_nbytes into the buffer pointed to by .Fa iocb->aio_buf , whereas .Fn aio_readv reads the data into the .Fa iocb->aio_iovcnt buffers specified by the members of the .Fa iocb->aio_iov array. -Both syscalls return immediately after the read request has -been enqueued to the descriptor; the read may or may not have -completed at the time the call returns. -.Pp For .Fn aio_readv the .Fa iovec structure is defined in .Xr readv 2 . .Pp The +.Fn aio_read2 +call takes the +.Fa flags +argument. +If +.Fa flags +is passed as zero, the call behaves identically to +.Fn aio_read . +The following flags can be specified by logical or: +.Bl -tag -width AIO_OP2_VECTORED +.It AIO_OP2_FOFFSET +The read occurs at the file descriptor offset, +which is advanced by the operation as done by the +.Xr read 2 +syscall. +The +.Fa iocb->aio_offset +field is ignored. +.It AIO_OP2_VECTORED +Similar to +.Fn aio_readv , +the read buffers are specified by the +.Fa aiocb->aio_iov +array. +.El +.Pp +The .Fa iocb pointer may be subsequently used as an argument to .Fn aio_return and .Fn aio_error in order to determine return or error status for the enqueued operation while it is in progress. .Pp If the request could not be enqueued (generally due to invalid arguments), then the call returns without having enqueued the request. .Pp If the request is successfully enqueued, the value of .Fa iocb->aio_offset can be modified during the request as context, so this value must not be referenced after the request is enqueued. .Pp The .Fa iocb->aio_sigevent structure can be used to request notification of the operation's completion as described in .Xr aio 4 . .Sh RESTRICTIONS The Asynchronous I/O Control Block structure pointed to by .Fa iocb and the buffer that the .Fa iocb->aio_buf member of that structure references must remain valid until the operation has completed. .Pp The asynchronous I/O control buffer .Fa iocb -should be zeroed before the -.Fn aio_read -call to avoid passing bogus context information to the kernel. +should be zeroed before the system +calls to avoid passing bogus context information to the kernel. .Pp Modifications of the Asynchronous I/O Control Block structure or the buffer contents are not allowed while the request is queued. .Pp If the file offset in .Fa iocb->aio_offset is past the offset maximum for .Fa iocb->aio_fildes , no I/O will occur. .Sh RETURN VALUES -.Rv -std aio_read aio_readv +.Rv -std aio_read aio_read2 aio_readv .Sh DIAGNOSTICS None. .Sh ERRORS The -.Fn aio_read +.Fn aio_read , +.Fn aio_read2 , and .Fn aio_readv system calls will fail if: .Bl -tag -width Er .It Bq Er EAGAIN The request was not queued because of system resource limitations. .It Bq Er EFAULT Part of .Fa aio_iov points outside the process's allocated address space. .It Bq Er EINVAL The asynchronous notification method in .Fa iocb->aio_sigevent.sigev_notify is invalid or not supported. .It Bq Er EOPNOTSUPP Asynchronous read operations on the file descriptor .Fa iocb->aio_fildes are unsafe and unsafe asynchronous I/O operations are disabled. .El .Pp The following conditions may be synchronously detected when the .Fn aio_read or .Fn aio_readv system call is made, or asynchronously, at any time thereafter. If they are detected at call time, -.Fn aio_read -or -.Fn aio_readv -returns -1 and sets +The calls return -1 and set .Va errno appropriately; otherwise the .Fn aio_return system call must be called, and will return -1, and .Fn aio_error must be called to determine the actual value that would have been returned in .Va errno . .Bl -tag -width Er .It Bq Er EBADF The .Fa iocb->aio_fildes argument is invalid. .It Bq Er EINVAL The offset .Fa iocb->aio_offset is not valid, the priority specified by .Fa iocb->aio_reqprio is not a valid priority, or the number of bytes specified by .Fa iocb->aio_nbytes is not valid. .It Bq Er EOVERFLOW The file is a regular file, .Fa iocb->aio_nbytes is greater than zero, the starting offset in .Fa iocb->aio_offset is before the end of the file, but is at or beyond the .Fa iocb->aio_fildes offset maximum. .El .Pp If the request is successfully enqueued, but subsequently cancelled or an error occurs, the value returned by the .Fn aio_return system call is per the .Xr read 2 system call, and the value returned by the .Fn aio_error system call is either one of the error returns from the .Xr read 2 system call, or one of: .Bl -tag -width Er .It Bq Er EBADF The .Fa iocb->aio_fildes argument is invalid for reading. .It Bq Er ECANCELED The request was explicitly cancelled via a call to .Fn aio_cancel . .It Bq Er EINVAL The offset .Fa iocb->aio_offset would be invalid. .El .Sh SEE ALSO .Xr aio_cancel 2 , .Xr aio_error 2 , .Xr aio_return 2 , .Xr aio_suspend 2 , .Xr aio_waitcomplete 2 , .Xr aio_write 2 , .Xr sigevent 3 , .Xr siginfo 3 , .Xr aio 4 .Sh STANDARDS The .Fn aio_read system call is expected to conform to the .St -p1003.1 standard. The +.Fn aio_read2 +and .Fn aio_readv -system call is a FreeBSD extension, and should not be used in portable code. +system calls are FreeBSD extensions, +and should not be used in portable code. .Sh HISTORY The .Fn aio_read system call first appeared in .Fx 3.0 . The .Fn aio_readv system call first appeared in .Fx 13.0 . +The +.Fn aio_read2 +system call first appeared in +.Fx 14.1 . .Sh AUTHORS This manual page was written by .An Terry Lambert Aq Mt terry@whistle.com . .Sh BUGS Invalid information in .Fa iocb->_aiocb_private may confuse the kernel. diff --git a/lib/libsys/aio_write.2 b/lib/libsys/aio_write.2 index 32ad53019ed2..f59406b8ab36 100644 --- a/lib/libsys/aio_write.2 +++ b/lib/libsys/aio_write.2 @@ -1,249 +1,289 @@ .\" Copyright (c) 1999 Softweyr LLC. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY Softweyr LLC AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL Softweyr LLC OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd November 15, 2023 +.Dd February 1, 2024 .Dt AIO_WRITE 2 .Os .Sh NAME .Nm aio_write , +.Nm aio_write2 , .Nm aio_writev .Nd asynchronous write to a file (REALTIME) .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In aio.h .Ft int .Fn aio_write "struct aiocb *iocb" +.Ft int +.Fn aio_write2 "struct aiocb *iocb" "int flags" .In sys/uio.h .Ft int .Fn aio_writev "struct aiocb *iocb" .Sh DESCRIPTION The -.Fn aio_write +.Fn aio_write , +.Fn aio_write2 , and .Fn aio_writev system calls allow the calling process to write to the descriptor .Fa iocb->aio_fildes . +The syscalls return immediately after the write request has been enqueued +to the descriptor; the write may or may not have completed at the time +the call returns. +.Pp +The .Fn aio_write -will write +call will write .Fa iocb->aio_nbytes from the buffer pointed to by .Fa iocb->aio_buf , whereas .Fn aio_writev gathers the data from the .Fa iocb->aio_iovcnt buffers specified by the members of the .Fa iocb->aio_iov array. -Both syscalls return immediately after the write request has been enqueued -to the descriptor; the write may or may not have completed at the time -the call returns. +.Pp If the request could not be enqueued, generally due to invalid arguments, the call returns without having enqueued the request. .Pp For .Fn aio_writev the .Fa iovec structure is defined in .Xr writev 2 . .Pp If .Dv O_APPEND is set for .Fa iocb->aio_fildes , write operations append to the file in the same order as the calls were made. If .Dv O_APPEND -is not set for the file descriptor, the write operation will occur at +is not set for the file descriptor, the write operation for +.Fn aio_write +will occur at the absolute position from the beginning of the file plus .Fa iocb->aio_offset . .Pp The +.Fn aio_write2 +call takes the +.Fa flags +argument. +If +.Fa flags +is passed as zero, the call behaves identically to +.Fn aio_write . +The following flags can be specified by logical or: +.Bl -tag -width AIO_OP2_VECTORED +.It AIO_OP2_FOFFSET +The write for non +.Dv O_APPEND +file descriptors occurs at the file descriptor offset, +which is advanced by the operation as done by the +.Xr write 2 +syscall. +The +.Fa iocb->aio_offset +field is ignored. +.It AIO_OP2_VECTORED +Similar to +.Fn aio_writev , +the write buffers are specified by the +.Fa aiocb->aio_iov +array. +.El +.Pp +The .Fa iocb pointer may be subsequently used as an argument to .Fn aio_return and .Fn aio_error in order to determine return or error status for the enqueued operation while it is in progress. .Pp If the request is successfully enqueued, the value of .Fa iocb->aio_offset can be modified during the request as context, so this value must not be referenced after the request is enqueued. .Pp The .Fa iocb->aio_sigevent structure can be used to request notification of the operation's completion as described in .Xr aio 4 . .Sh RESTRICTIONS The Asynchronous I/O Control Block structure pointed to by .Fa iocb and the buffer that the .Fa iocb->aio_buf member of that structure references must remain valid until the operation has completed. .Pp The asynchronous I/O control buffer .Fa iocb should be zeroed before the -.Fn aio_write -or -.Fn aio_writev -system call to avoid passing bogus context information to the kernel. +system calls to avoid passing bogus context information to the kernel. .Pp Modifications of the Asynchronous I/O Control Block structure or the buffer contents are not allowed while the request is queued. .Pp If the file offset in .Fa iocb->aio_offset is past the offset maximum for .Fa iocb->aio_fildes , no I/O will occur. .Sh RETURN VALUES .Rv -std aio_write aio_writev .Sh ERRORS The -.Fn aio_write +.Fn aio_write , +.Fn aio_write2 , and .Fn aio_writev system calls will fail if: .Bl -tag -width Er .It Bq Er EAGAIN The request was not queued because of system resource limitations. .It Bq Er EFAULT Part of .Fa aio_iov points outside the process's allocated address space. .It Bq Er EINVAL The asynchronous notification method in .Fa iocb->aio_sigevent.sigev_notify is invalid or not supported. .It Bq Er EOPNOTSUPP Asynchronous write operations on the file descriptor .Fa iocb->aio_fildes are unsafe and unsafe asynchronous I/O operations are disabled. .El .Pp The following conditions may be synchronously detected when the -.Fn aio_write +.Fn aio_write , +.Fn aio_write2 , or .Fn aio_writev system call is made, or asynchronously, at any time thereafter. If they -are detected at call time, -.Fn aio_write -or -.Fn aio_writev -returns -1 and sets +are detected at call time, the calls return -1 and set .Va errno appropriately; otherwise the .Fn aio_return system call must be called, and will return -1, and .Fn aio_error must be called to determine the actual value that would have been returned in .Va errno . .Bl -tag -width Er .It Bq Er EBADF The .Fa iocb->aio_fildes argument is invalid, or is not opened for writing. .It Bq Er EINVAL The offset .Fa iocb->aio_offset is not valid, the priority specified by .Fa iocb->aio_reqprio is not a valid priority, or the number of bytes specified by .Fa iocb->aio_nbytes is not valid. .El .Pp If the request is successfully enqueued, but subsequently canceled or an error occurs, the value returned by the .Fn aio_return system call is per the .Xr write 2 system call, and the value returned by the .Fn aio_error system call is either one of the error returns from the .Xr write 2 system call, or one of: .Bl -tag -width Er .It Bq Er EBADF The .Fa iocb->aio_fildes argument is invalid for writing. .It Bq Er ECANCELED The request was explicitly canceled via a call to .Fn aio_cancel . .It Bq Er EINVAL The offset .Fa iocb->aio_offset would be invalid. .El .Sh SEE ALSO .Xr aio_cancel 2 , .Xr aio_error 2 , .Xr aio_return 2 , .Xr aio_suspend 2 , .Xr aio_waitcomplete 2 , .Xr sigevent 3 , .Xr siginfo 3 , .Xr aio 4 .Sh STANDARDS The .Fn aio_write system call is expected to conform to the .St -p1003.1 standard. .Pp The +.Fn aio_write2 +and .Fn aio_writev -system call is a FreeBSD extension, and should not be used in portable code. +system calls are FreeBSD extensions, +and should not be used in portable code. .Sh HISTORY The .Fn aio_write system call first appeared in .Fx 3.0 . The .Fn aio_writev system call first appeared in .Fx 13.0 . +The +.Fn aio_write2 +system call first appeared in +.Fx 14.1 . .Sh AUTHORS This manual page was written by .An Wes Peters Aq Mt wes@softweyr.com . .Sh BUGS Invalid information in .Fa iocb->_aiocb_private may confuse the kernel.