github.com/containers/podman/v2@v2.2.2-0.20210501105131-c1e07d070c4c/pkg/signal/signal_linux.go (about)

     1  // +build linux
     2  
     3  // Signal handling for Linux only.
     4  package signal
     5  
     6  // Copyright 2013-2018 Docker, Inc.
     7  
     8  // NOTE: this package has originally been copied from github.com/docker/docker.
     9  
    10  import (
    11  	"os"
    12  	"os/signal"
    13  	"syscall"
    14  
    15  	"golang.org/x/sys/unix"
    16  )
    17  
    18  const (
    19  	sigrtmin = 34
    20  	sigrtmax = 64
    21  
    22  	SIGWINCH = syscall.SIGWINCH // For cross-compilation with Windows
    23  )
    24  
    25  // signalMap is a map of Linux signals.
    26  var signalMap = map[string]syscall.Signal{
    27  	"ABRT":     unix.SIGABRT,
    28  	"ALRM":     unix.SIGALRM,
    29  	"BUS":      unix.SIGBUS,
    30  	"CHLD":     unix.SIGCHLD,
    31  	"CLD":      unix.SIGCLD,
    32  	"CONT":     unix.SIGCONT,
    33  	"FPE":      unix.SIGFPE,
    34  	"HUP":      unix.SIGHUP,
    35  	"ILL":      unix.SIGILL,
    36  	"INT":      unix.SIGINT,
    37  	"IO":       unix.SIGIO,
    38  	"IOT":      unix.SIGIOT,
    39  	"KILL":     unix.SIGKILL,
    40  	"PIPE":     unix.SIGPIPE,
    41  	"POLL":     unix.SIGPOLL,
    42  	"PROF":     unix.SIGPROF,
    43  	"PWR":      unix.SIGPWR,
    44  	"QUIT":     unix.SIGQUIT,
    45  	"SEGV":     unix.SIGSEGV,
    46  	"STKFLT":   unix.SIGSTKFLT,
    47  	"STOP":     unix.SIGSTOP,
    48  	"SYS":      unix.SIGSYS,
    49  	"TERM":     unix.SIGTERM,
    50  	"TRAP":     unix.SIGTRAP,
    51  	"TSTP":     unix.SIGTSTP,
    52  	"TTIN":     unix.SIGTTIN,
    53  	"TTOU":     unix.SIGTTOU,
    54  	"URG":      unix.SIGURG,
    55  	"USR1":     unix.SIGUSR1,
    56  	"USR2":     unix.SIGUSR2,
    57  	"VTALRM":   unix.SIGVTALRM,
    58  	"WINCH":    unix.SIGWINCH,
    59  	"XCPU":     unix.SIGXCPU,
    60  	"XFSZ":     unix.SIGXFSZ,
    61  	"RTMIN":    sigrtmin,
    62  	"RTMIN+1":  sigrtmin + 1,
    63  	"RTMIN+2":  sigrtmin + 2,
    64  	"RTMIN+3":  sigrtmin + 3,
    65  	"RTMIN+4":  sigrtmin + 4,
    66  	"RTMIN+5":  sigrtmin + 5,
    67  	"RTMIN+6":  sigrtmin + 6,
    68  	"RTMIN+7":  sigrtmin + 7,
    69  	"RTMIN+8":  sigrtmin + 8,
    70  	"RTMIN+9":  sigrtmin + 9,
    71  	"RTMIN+10": sigrtmin + 10,
    72  	"RTMIN+11": sigrtmin + 11,
    73  	"RTMIN+12": sigrtmin + 12,
    74  	"RTMIN+13": sigrtmin + 13,
    75  	"RTMIN+14": sigrtmin + 14,
    76  	"RTMIN+15": sigrtmin + 15,
    77  	"RTMAX-14": sigrtmax - 14,
    78  	"RTMAX-13": sigrtmax - 13,
    79  	"RTMAX-12": sigrtmax - 12,
    80  	"RTMAX-11": sigrtmax - 11,
    81  	"RTMAX-10": sigrtmax - 10,
    82  	"RTMAX-9":  sigrtmax - 9,
    83  	"RTMAX-8":  sigrtmax - 8,
    84  	"RTMAX-7":  sigrtmax - 7,
    85  	"RTMAX-6":  sigrtmax - 6,
    86  	"RTMAX-5":  sigrtmax - 5,
    87  	"RTMAX-4":  sigrtmax - 4,
    88  	"RTMAX-3":  sigrtmax - 3,
    89  	"RTMAX-2":  sigrtmax - 2,
    90  	"RTMAX-1":  sigrtmax - 1,
    91  	"RTMAX":    sigrtmax,
    92  }
    93  
    94  // CatchAll catches all signals and relays them to the specified channel.
    95  func CatchAll(sigc chan os.Signal) {
    96  	handledSigs := make([]os.Signal, 0, len(signalMap))
    97  	for _, s := range signalMap {
    98  		handledSigs = append(handledSigs, s)
    99  	}
   100  	signal.Notify(sigc, handledSigs...)
   101  }
   102  
   103  // StopCatch stops catching the signals and closes the specified channel.
   104  func StopCatch(sigc chan os.Signal) {
   105  	signal.Stop(sigc)
   106  	close(sigc)
   107  }