99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
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package sys
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import "strconv"
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// Errno is a subset of POSIX errno used by wazero interfaces. Zero is not an
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// error. Other values should not be interpreted numerically, rather by constants
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// prefixed with 'E'.
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//
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// See https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/errno.h.html
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type Errno uint16
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// ^-- Note: This will eventually move to the public /sys package. It is
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// experimental until we audit the socket related APIs to ensure we have all
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// the Errno it returns, and we export fs.FS. This is not in /internal/sys as
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// that would introduce a package cycle.
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// This is a subset of errors to reduce implementation burden. `wasip1` defines
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// almost all POSIX error numbers, but not all are used in practice. wazero
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// will add ones needed in POSIX order, as needed by functions that explicitly
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// document returning them.
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//
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// https://github.com/WebAssembly/WASI/blob/snapshot-01/phases/snapshot/docs.md#-errno-enumu16
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const (
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EACCES Errno = iota + 1
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EAGAIN
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EBADF
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EEXIST
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EFAULT
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EINTR
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EINVAL
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EIO
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EISDIR
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ELOOP
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ENAMETOOLONG
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ENOENT
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ENOSYS
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ENOTDIR
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ERANGE
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ENOTEMPTY
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ENOTSOCK
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ENOTSUP
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EPERM
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EROFS
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// NOTE ENOTCAPABLE is defined in wasip1, but not in POSIX. wasi-libc
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// converts it to EBADF, ESPIPE or EINVAL depending on the call site.
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// It isn't known if compilers who don't use ENOTCAPABLE would crash on it.
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)
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// Error implements error
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func (e Errno) Error() string {
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switch e {
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case 0: // not an error
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return "success"
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case EACCES:
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return "permission denied"
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case EAGAIN:
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return "resource unavailable, try again"
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case EBADF:
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return "bad file descriptor"
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case EEXIST:
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return "file exists"
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case EFAULT:
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return "bad address"
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case EINTR:
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return "interrupted function"
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case EINVAL:
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return "invalid argument"
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case EIO:
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return "input/output error"
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case EISDIR:
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return "is a directory"
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case ELOOP:
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return "too many levels of symbolic links"
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case ENAMETOOLONG:
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return "filename too long"
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case ENOENT:
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return "no such file or directory"
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case ENOSYS:
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return "functionality not supported"
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case ENOTDIR:
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return "not a directory or a symbolic link to a directory"
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case ERANGE:
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return "result too large"
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case ENOTEMPTY:
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return "directory not empty"
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case ENOTSOCK:
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return "not a socket"
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case ENOTSUP:
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return "not supported (may be the same value as [EOPNOTSUPP])"
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case EPERM:
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return "operation not permitted"
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case EROFS:
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return "read-only file system"
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default:
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return "Errno(" + strconv.Itoa(int(e)) + ")"
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}
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}
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