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unix: add API for fsconfig system call
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Fixes golang/go#59537

Change-Id: I8d806ace3adad423c633813455d8f758706cee1d
Reviewed-on: https://go-review.googlesource.com/c/sys/+/484995
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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IlyaHanov authored and gopherbot committed Feb 16, 2024
1 parent 7ff74af commit 360f961
Showing 4 changed files with 127 additions and 0 deletions.
9 changes: 9 additions & 0 deletions unix/linux/types.go
Original file line number Diff line number Diff line change
@@ -989,6 +989,15 @@ const (
FSPICK_EMPTY_PATH = C.FSPICK_EMPTY_PATH

FSMOUNT_CLOEXEC = C.FSMOUNT_CLOEXEC

FSCONFIG_SET_FLAG = C.FSCONFIG_SET_FLAG
FSCONFIG_SET_STRING = C.FSCONFIG_SET_STRING
FSCONFIG_SET_BINARY = C.FSCONFIG_SET_BINARY
FSCONFIG_SET_PATH = C.FSCONFIG_SET_PATH
FSCONFIG_SET_PATH_EMPTY = C.FSCONFIG_SET_PATH_EMPTY
FSCONFIG_SET_FD = C.FSCONFIG_SET_FD
FSCONFIG_CMD_CREATE = C.FSCONFIG_CMD_CREATE
FSCONFIG_CMD_RECONFIGURE = C.FSCONFIG_CMD_RECONFIGURE
)

type OpenHow C.struct_open_how
99 changes: 99 additions & 0 deletions unix/syscall_linux.go
Original file line number Diff line number Diff line change
@@ -1849,6 +1849,105 @@ func Dup2(oldfd, newfd int) error {
//sys Fsmount(fd int, flags int, mountAttrs int) (fsfd int, err error)
//sys Fsopen(fsName string, flags int) (fd int, err error)
//sys Fspick(dirfd int, pathName string, flags int) (fd int, err error)

//sys fsconfig(fd int, cmd uint, key *byte, value *byte, aux int) (err error)

func fsconfigCommon(fd int, cmd uint, key string, value *byte, aux int) (err error) {
var keyp *byte
if keyp, err = BytePtrFromString(key); err != nil {
return
}
return fsconfig(fd, cmd, keyp, value, aux)
}

// FsconfigSetFlag is equivalent to fsconfig(2) called
// with cmd == FSCONFIG_SET_FLAG.
//
// fd is the filesystem context to act upon.
// key the parameter key to set.
func FsconfigSetFlag(fd int, key string) (err error) {
return fsconfigCommon(fd, FSCONFIG_SET_FLAG, key, nil, 0)
}

// FsconfigSetString is equivalent to fsconfig(2) called
// with cmd == FSCONFIG_SET_STRING.
//
// fd is the filesystem context to act upon.
// key the parameter key to set.
// value is the parameter value to set.
func FsconfigSetString(fd int, key string, value string) (err error) {
var valuep *byte
if valuep, err = BytePtrFromString(value); err != nil {
return
}
return fsconfigCommon(fd, FSCONFIG_SET_STRING, key, valuep, 0)
}

// FsconfigSetBinary is equivalent to fsconfig(2) called
// with cmd == FSCONFIG_SET_BINARY.
//
// fd is the filesystem context to act upon.
// key the parameter key to set.
// value is the parameter value to set.
func FsconfigSetBinary(fd int, key string, value []byte) (err error) {
if len(value) == 0 {
return EINVAL
}
return fsconfigCommon(fd, FSCONFIG_SET_BINARY, key, &value[0], len(value))
}

// FsconfigSetPath is equivalent to fsconfig(2) called
// with cmd == FSCONFIG_SET_PATH.
//
// fd is the filesystem context to act upon.
// key the parameter key to set.
// path is a non-empty path for specified key.
// atfd is a file descriptor at which to start lookup from or AT_FDCWD.
func FsconfigSetPath(fd int, key string, path string, atfd int) (err error) {
var valuep *byte
if valuep, err = BytePtrFromString(path); err != nil {
return
}
return fsconfigCommon(fd, FSCONFIG_SET_PATH, key, valuep, atfd)
}

// FsconfigSetPathEmpty is equivalent to fsconfig(2) called
// with cmd == FSCONFIG_SET_PATH_EMPTY. The same as
// FconfigSetPath but with AT_PATH_EMPTY implied.
func FsconfigSetPathEmpty(fd int, key string, path string, atfd int) (err error) {
var valuep *byte
if valuep, err = BytePtrFromString(path); err != nil {
return
}
return fsconfigCommon(fd, FSCONFIG_SET_PATH_EMPTY, key, valuep, atfd)
}

// FsconfigSetFd is equivalent to fsconfig(2) called
// with cmd == FSCONFIG_SET_FD.
//
// fd is the filesystem context to act upon.
// key the parameter key to set.
// value is a file descriptor to be assigned to specified key.
func FsconfigSetFd(fd int, key string, value int) (err error) {
return fsconfigCommon(fd, FSCONFIG_SET_FD, key, nil, value)
}

// FsconfigCreate is equivalent to fsconfig(2) called
// with cmd == FSCONFIG_CMD_CREATE.
//
// fd is the filesystem context to act upon.
func FsconfigCreate(fd int) (err error) {
return fsconfig(fd, FSCONFIG_CMD_CREATE, nil, nil, 0)
}

// FsconfigReconfigure is equivalent to fsconfig(2) called
// with cmd == FSCONFIG_CMD_RECONFIGURE.
//
// fd is the filesystem context to act upon.
func FsconfigReconfigure(fd int) (err error) {
return fsconfig(fd, FSCONFIG_CMD_RECONFIGURE, nil, nil, 0)
}

//sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64
//sysnb Getpgid(pid int) (pgid int, err error)

10 changes: 10 additions & 0 deletions unix/zsyscall_linux.go

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9 changes: 9 additions & 0 deletions unix/ztypes_linux.go

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