github.com/camlistore/go4@v0.0.0-20200104003542-c7e774b10ea0/osutil/exec_solaris_amd64.go (about) 1 // Copyright 2015 The go4 Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 // +build amd64,solaris 16 17 package osutil 18 19 import ( 20 "os" 21 "syscall" 22 "unsafe" 23 ) 24 25 //go:cgo_import_dynamic libc_getexecname getexecname "libc.so" 26 //go:linkname libc_getexecname libc_getexecname 27 28 var libc_getexecname uintptr 29 30 func getexecname() (path unsafe.Pointer, err error) { 31 r0, _, e1 := syscall.Syscall6(uintptr(unsafe.Pointer(&libc_getexecname)), 0, 0, 0, 0, 0, 0) 32 path = unsafe.Pointer(r0) 33 if e1 != 0 { 34 err = syscall.Errno(e1) 35 } 36 return 37 } 38 39 func syscallGetexecname() (path string, err error) { 40 ptr, err := getexecname() 41 if err != nil { 42 return "", err 43 } 44 bytes := (*[1 << 29]byte)(ptr)[:] 45 for i, b := range bytes { 46 if b == 0 { 47 return string(bytes[:i]), nil 48 } 49 } 50 panic("unreachable") 51 } 52 53 var initCwd, initCwdErr = os.Getwd() 54 55 func executable() (string, error) { 56 path, err := syscallGetexecname() 57 if err != nil { 58 return path, err 59 } 60 if len(path) > 0 && path[0] != '/' { 61 if initCwdErr != nil { 62 return path, initCwdErr 63 } 64 if len(path) > 2 && path[0:2] == "./" { 65 // skip "./" 66 path = path[2:] 67 } 68 return initCwd + "/" + path, nil 69 } 70 return path, nil 71 }