diff options
Diffstat (limited to 'vendor/github.com/opencontainers/runc/libcontainer/cgroups/fscommon/fscommon.go')
-rw-r--r-- | vendor/github.com/opencontainers/runc/libcontainer/cgroups/fscommon/fscommon.go | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/cgroups/fscommon/fscommon.go b/vendor/github.com/opencontainers/runc/libcontainer/cgroups/fscommon/fscommon.go new file mode 100644 index 000000000..ae2613cdb --- /dev/null +++ b/vendor/github.com/opencontainers/runc/libcontainer/cgroups/fscommon/fscommon.go @@ -0,0 +1,51 @@ +// +build linux + +package fscommon + +import ( + "bytes" + "os" + + "github.com/pkg/errors" + "github.com/sirupsen/logrus" + "golang.org/x/sys/unix" +) + +// WriteFile writes data to a cgroup file in dir. +// It is supposed to be used for cgroup files only. +func WriteFile(dir, file, data string) error { + fd, err := OpenFile(dir, file, unix.O_WRONLY) + if err != nil { + return err + } + defer fd.Close() + if err := retryingWriteFile(fd, data); err != nil { + return errors.Wrapf(err, "failed to write %q", data) + } + return nil +} + +// ReadFile reads data from a cgroup file in dir. +// It is supposed to be used for cgroup files only. +func ReadFile(dir, file string) (string, error) { + fd, err := OpenFile(dir, file, unix.O_RDONLY) + if err != nil { + return "", err + } + defer fd.Close() + var buf bytes.Buffer + + _, err = buf.ReadFrom(fd) + return buf.String(), err +} + +func retryingWriteFile(fd *os.File, data string) error { + for { + _, err := fd.Write([]byte(data)) + if errors.Is(err, unix.EINTR) { + logrus.Infof("interrupted while writing %s to %s", data, fd.Name()) + continue + } + return err + } +} |