github.com/ggreg80/ketos@v0.0.0-20171109040536-049616f51ddb/libcfs/open.go (about)

     1  package main
     2  
     3  import (
     4  	"github.com/rainycape/dl"
     5  	"os"
     6  )
     7  
     8  import "C"
     9  
    10  //export open
    11  func open(cPath *C.char, cFlags C.uint, cMode C.int) C.int {
    12  
    13  	path := C.GoString(cPath)
    14  	ro := cFlags&C.uint(os.O_WRONLY|os.O_RDWR|os.O_APPEND|os.O_CREATE) == 0
    15  
    16  	expand := RootLayers.ExpandPath
    17  	if !ro {
    18  		expand = RootLayers.CopyForWriting
    19  	}
    20  
    21  	expanded, err := expand(path)
    22  	if err != nil {
    23  		setErrno(err)
    24  		return -1
    25  	}
    26  
    27  	libc, err := dl.Open("libc", 0)
    28  	if err != nil {
    29  		setErrno(err)
    30  		return -1
    31  	}
    32  	defer libc.Close()
    33  
    34  	var libc_open func(string, uint, int) C.int
    35  	err = libc.Sym("open", &libc_open)
    36  	if err != nil {
    37  		setErrno(err)
    38  		return -1
    39  	}
    40  
    41  	return libc_open(expanded, uint(cFlags), int(cMode))
    42  }