sys_unix.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build unix || (js && wasm) || wasip1
     6  
     7  package time
     8  
     9  import (
    10  	"errors"
    11  	"runtime"
    12  	"syscall"
    13  )
    14  
    15  // for testing: whatever interrupts a sleep
    16  func interrupt() {
    17  	// There is no mechanism in wasi to interrupt the call to poll_oneoff
    18  	// used to implement runtime.usleep so this function does nothing, which
    19  	// somewhat defeats the purpose of TestSleep but we are still better off
    20  	// validating that time elapses when the process calls time.Sleep than
    21  	// skipping the test altogether.
    22  	if runtime.GOOS != "wasip1" {
    23  		syscall.Kill(syscall.Getpid(), syscall.SIGCHLD)
    24  	}
    25  }
    26  
    27  func open(name string) (uintptr, error) {
    28  	fd, err := syscall.Open(name, syscall.O_RDONLY, 0)
    29  	if err != nil {
    30  		return 0, err
    31  	}
    32  	return uintptr(fd), nil
    33  }
    34  
    35  func read(fd uintptr, buf []byte) (int, error) {
    36  	return syscall.Read(int(fd), buf)
    37  }
    38  
    39  func closefd(fd uintptr) {
    40  	syscall.Close(int(fd))
    41  }
    42  
    43  func preadn(fd uintptr, buf []byte, off int) error {
    44  	whence := seekStart
    45  	if off < 0 {
    46  		whence = seekEnd
    47  	}
    48  	if _, err := syscall.Seek(int(fd), int64(off), whence); err != nil {
    49  		return err
    50  	}
    51  	for len(buf) > 0 {
    52  		m, err := syscall.Read(int(fd), buf)
    53  		if m <= 0 {
    54  			if err == nil {
    55  				return errors.New("short read")
    56  			}
    57  			return err
    58  		}
    59  		buf = buf[m:]
    60  	}
    61  	return nil
    62  }
    63
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