go-ceph/errutil/strerror.go

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/*
Package errutil provides common functions for dealing with error conditions for
all ceph api wrappers.
*/
package errutil
/* force XSI-complaint strerror_r() */
// #define _POSIX_C_SOURCE 200112L
// #undef _GNU_SOURCE
// #include <stdlib.h>
// #include <errno.h>
// #include <string.h>
import "C"
import (
"unsafe"
)
// FormatErrno returns the absolute value of the errno as well as a string
// describing the errno. The string will be empty is the errno is not known.
func FormatErrno(errno int) (int, string) {
buf := make([]byte, 1024)
// strerror expects errno >= 0
if errno < 0 {
errno = -errno
}
ret := C.strerror_r(
C.int(errno),
(*C.char)(unsafe.Pointer(&buf[0])),
C.size_t(len(buf)))
if ret != 0 {
return errno, ""
}
return errno, C.GoString((*C.char)(unsafe.Pointer(&buf[0])))
}
// StrError returns a string describing the errno. The string will be empty if
// the errno is not known.
func StrError(errno int) string {
_, s := FormatErrno(errno)
return s
}