// getDetails fills in CPU, memory, FD usage, and command line details for the process.
func (proc *Process) getDetails(cmdline string) error {
proc.Mem = sigar.ProcMem{}
if err := proc.Mem.Get(proc.Pid); err != nil {
return fmt.Errorf("error getting process mem for pid=%d: %v", proc.Pid, err)
}
proc.Cpu = sigar.ProcTime{}
if err := proc.Cpu.Get(proc.Pid); err != nil {
return fmt.Errorf("error getting process cpu time for pid=%d: %v", proc.Pid, err)
}
if cmdline == "" {
args := sigar.ProcArgs{}
if err := args.Get(proc.Pid); err != nil && !sigar.IsNotImplemented(err) {
return fmt.Errorf("error getting process arguments for pid=%d: %v", proc.Pid, err)
}
proc.CmdLine = strings.Join(args.List, " ")
} else {
proc.CmdLine = cmdline
}
if fd, err := getProcFDUsage(proc.Pid); err != nil {
return fmt.Errorf("error getting process file descriptor usage for pid=%d: %v", proc.Pid, err)
} else if fd != nil {
proc.FD = *fd
}
return nil
}
// getProcFDUsage returns file descriptor usage information for the process
// identified by the given PID. If the feature is not implemented then nil
// is returned with no error. If there is a permission error while reading the
// data then nil is returned with no error (/proc/[pid]/fd requires root
// permissions). Any other errors that occur are returned.
func getProcFDUsage(pid int) (*sigar.ProcFDUsage, error) {
fd := sigar.ProcFDUsage{}
if err := fd.Get(pid); err != nil {
switch {
case sigar.IsNotImplemented(err):
return nil, nil
case os.IsPermission(err):
return nil, nil
default:
return nil, err
}
}
return &fd, nil
}
// getProcFDUsage returns file descriptor usage information for the process
// identified by the given PID. If the feature is not implemented then nil
// is returned with no error. If there is a permission error while reading the
// data then nil is returned with no error (/proc/[pid]/fd requires root
// permissions). Any other errors that occur are returned.
func getProcFDUsage(pid int) (*sigar.ProcFDUsage, error) {
// It's not possible to collect FD usage from other processes on FreeBSD
// due to linprocfs not exposing the information.
if runtime.GOOS == "freebsd" && pid != os.Getpid() {
return nil, nil
}
fd := sigar.ProcFDUsage{}
if err := fd.Get(pid); err != nil {
switch {
case sigar.IsNotImplemented(err):
return nil, nil
case os.IsPermission(err):
return nil, nil
default:
return nil, err
}
}
return &fd, nil
}