hurd: Use __hurd_fail () instead of assigning errno

The __hurd_fail () inline function is the dedicated, idiomatic way of
reporting errors in the Hurd part of glibc. Not only is it more concise
than '{ errno = err; return -1; }', it is since commit
6639cc10029e24e06b34e169712b21c31b8cf213
"hurd: Mark error functions as __COLD" marked with the cold attribute,
telling the compiler that this codepath is unlikely to be executed.

In one case, use __hurd_dfail () over the plain __hurd_fail ().

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230520115531.3911877-1-bugaevc@gmail.com>

44 files changed, 95 insertions, 242 deletions

diff --git a/sysdeps/mach/hurd/brk.c b/sysdeps/mach/hurd/brk.c
index 12aaba5..f134949 100644
--- a/sysdeps/mach/hurd/brk.c
+++ b/sysdeps/mach/hurd/brk.c
@@ -93,11 +93,8 @@ _hurd_set_brk (vm_address_t addr)
   __mutex_unlock (&_hurd_rlimit_lock);
 
   if (addr - brk_start > rlimit)
-    {
-      /* Need to increase the resource limit.  */
-      errno = ENOMEM;
-      return -1;
-    }
+    /* Need to increase the resource limit.  */
+    return __hurd_fail (ENOMEM);
 
   if (pagend > _hurd_data_end)
     {
diff --git a/sysdeps/mach/hurd/closedir.c b/sysdeps/mach/hurd/closedir.c
index 3a16418..46815f0 100644
--- a/sysdeps/mach/hurd/closedir.c
+++ b/sysdeps/mach/hurd/closedir.c
@@ -32,10 +32,7 @@ __closedir (DIR *dirp)
   error_t err;
 
   if (dirp == NULL)
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   __libc_lock_lock (dirp->__lock);
   err = __vm_deallocate (__mach_task_self (),
diff --git a/sysdeps/mach/hurd/cthreads.c b/sysdeps/mach/hurd/cthreads.c
index 87b6c06..4f5920b 100644
--- a/sysdeps/mach/hurd/cthreads.c
+++ b/sysdeps/mach/hurd/cthreads.c
@@ -17,6 +17,7 @@
 
 #include <libc-lock.h>
 #include <errno.h>
+#include <hurd.h>
 #include <stdlib.h>
 #include <pthreadP.h>
 
@@ -25,9 +26,8 @@ int
 weak_function
 __cthread_keycreate (__cthread_key_t *key)
 {
-  __set_errno (ENOSYS);
- *key = -1;
-  return -1;
+  *key = -1;
+  return __hurd_fail (ENOSYS);
 }
 
 /* Placeholder for key retrieval routine from Hurd cthreads library.  */
@@ -36,8 +36,7 @@ weak_function
 __cthread_getspecific (__cthread_key_t key, void **pval)
 {
   *pval = NULL;
-  __set_errno (ENOSYS);
-  return -1;
+  return __hurd_fail (ENOSYS);
 }
 
 /* Placeholder for key setting routine from Hurd cthreads library.  */
@@ -45,6 +44,5 @@ int
 weak_function
 __cthread_setspecific (__cthread_key_t key, void *val)
 {
-  __set_errno (ENOSYS);
-  return -1;
+  return __hurd_fail (ENOSYS);
 }
diff --git a/sysdeps/mach/hurd/dirfd.c b/sysdeps/mach/hurd/dirfd.c
index 9520f3e..2cf02c7 100644
--- a/sysdeps/mach/hurd/dirfd.c
+++ b/sysdeps/mach/hurd/dirfd.c
@@ -18,6 +18,7 @@
 
 #include <dirent.h>
 #include <dirstream.h>
+#include <hurd.h>
 #include <hurd/fd.h>
 #include <errno.h>
 
@@ -32,10 +33,7 @@ __dirfd (DIR *dirp)
     if (_hurd_dtable[fd] == dirp->__fd)
       break;
   if (fd == _hurd_dtablesize)
-    {
-      errno = EINVAL;
-      fd = -1;
-    }
+    fd = __hurd_fail (EINVAL);
   __mutex_unlock (&_hurd_dtable_lock);
   HURD_CRITICAL_END;
 
diff --git a/sysdeps/mach/hurd/dl-sysdep.c b/sysdeps/mach/hurd/dl-sysdep.c
index 79ebb0c..7c484d7 100644
--- a/sysdeps/mach/hurd/dl-sysdep.c
+++ b/sysdeps/mach/hurd/dl-sysdep.c
@@ -285,8 +285,7 @@ open_file (const char *file_name, int flags,
 				MACH_PORT_RIGHT_SEND, +1);
 	  return _dl_hurd_data->dtable[fd];
 	}
-      errno = EBADF;
-      return MACH_PORT_NULL;
+      return __hurd_fail (EBADF), MACH_PORT_NULL;
     }
 
   assert (!(flags & ~(O_READ | O_EXEC | O_CLOEXEC | O_IGNORE_CTTY)));
@@ -403,10 +402,7 @@ __ssize_t weak_function
 __writev (int fd, const struct iovec *iov, int niov)
 {
   if (fd >= _hurd_init_dtablesize)
-    {
-      errno = EBADF;
-      return -1;
-    }
+    return __hurd_fail (EBADF);
 
   int i;
   size_t total = 0;
@@ -554,8 +550,7 @@ check_no_hidden(__access);
 int weak_function
 __access (const char *file, int type)
 {
-  errno = ENOSYS;
-  return -1;
+  return __hurd_fail (ENOSYS);
 }
 check_no_hidden(__access_noerrno);
 int weak_function
@@ -697,8 +692,7 @@ check_no_hidden(__getcwd);
 char *weak_function
 __getcwd (char *buf, size_t size)
 {
-  errno = ENOSYS;
-  return NULL;
+  return __hurd_fail (ENOSYS), NULL;
 }
 
 /* This is used by dl-tunables.c to strdup strings.  We can just make this a
diff --git a/sysdeps/mach/hurd/dup3.c b/sysdeps/mach/hurd/dup3.c
index 0bcbbfd..c5f64bc 100644
--- a/sysdeps/mach/hurd/dup3.c
+++ b/sysdeps/mach/hurd/dup3.c
@@ -103,7 +103,7 @@ __dup3 (int fd, int fd2, int flags)
 	    {
 	      fd2 = -1;
 	      if (errno == EINVAL)
-		errno = EBADF;	/* POSIX.1-1990 6.2.1.2 ll 54-55.  */
+		__hurd_fail (EBADF);	/* POSIX.1-1990 6.2.1.2 ll 54-55.  */
 	    }
 	  else
 	    {
diff --git a/sysdeps/mach/hurd/f_setlk.c b/sysdeps/mach/hurd/f_setlk.c
index 5c60a63..9f1b0ba 100644
--- a/sysdeps/mach/hurd/f_setlk.c
+++ b/sysdeps/mach/hurd/f_setlk.c
@@ -19,6 +19,7 @@
 #include <sys/types.h>
 #include <sys/file.h>
 #include <fcntl.h>
+#include <hurd.h>
 #include <unistd.h>
 #include <errno.h>
 
@@ -39,8 +40,7 @@ __f_setlk (int fd, int type, int whence, __off64_t start, __off64_t len, int wai
     case F_WRLCK: cmd = LOCK_EX; break;
     case F_UNLCK: cmd = LOCK_UN; break;
     default:
-      errno = EINVAL;
-      return -1;
+      return __hurd_fail (EINVAL);
     }
 
   if (cmd != LOCK_UN && wait == 0)
@@ -71,11 +71,9 @@ __f_setlk (int fd, int type, int whence, __off64_t start, __off64_t len, int wai
       /* FALLTHROUGH */
     case SEEK_CUR:
     case SEEK_END:
-      errno = ENOTSUP;
-      return -1;
+      return __hurd_fail (ENOTSUP);
     default:
-      errno = EINVAL;
-      return -1;
+      return __hurd_fail (EINVAL);
     }
 
   return __flock (fd, cmd);
diff --git a/sysdeps/mach/hurd/fcntl.c b/sysdeps/mach/hurd/fcntl.c
index a89d6d3..0b9a64b 100644
--- a/sysdeps/mach/hurd/fcntl.c
+++ b/sysdeps/mach/hurd/fcntl.c
@@ -48,8 +48,7 @@ __libc_fcntl (int fd, int cmd, ...)
       error_t err;
 
     default:			/* Bad command.  */
-      errno = EINVAL;
-      result = -1;
+      result = __hurd_fail (EINVAL);
       break;
 
       /* First the descriptor-based commands, which do no RPCs.  */
@@ -149,8 +148,7 @@ __libc_fcntl (int fd, int cmd, ...)
 	    cmd = F_SETLKW64;
 	    break;
 	  default:
-	    errno = EINVAL;
-	    return -1;
+	    return __hurd_fail (EINVAL);
 	  }
 
 	struct flock64 fl64 = {
@@ -183,8 +181,7 @@ __libc_fcntl (int fd, int cmd, ...)
 	    switch (cmd)
 	      {
 	      case F_GETLK64:
-		errno = ENOSYS;
-		return -1;
+		return __hurd_fail (ENOSYS);
 	      case F_SETLKW64:
 		wait = 1;
 		/* FALLTHROUGH */
@@ -192,8 +189,7 @@ __libc_fcntl (int fd, int cmd, ...)
 		return __f_setlk (fd, fl->l_type, fl->l_whence,
 				  fl->l_start, fl->l_len, wait);
 	      default:
-		errno = EINVAL;
-		return -1;
+		return __hurd_fail (EINVAL);
 	      }
 	  }
 	else if (cmd == F_GETLK64)
@@ -208,10 +204,7 @@ __libc_fcntl (int fd, int cmd, ...)
 		 && fl->l_start != fl64.l_start)
 	     || (sizeof fl->l_len != sizeof fl64.l_len
 		 && fl->l_len != fl64.l_len))
-	      {
-		errno = EOVERFLOW;
-		return -1;
-	      }
+	      return __hurd_fail (EOVERFLOW);
 	  }
 
 	result = err ? __hurd_dfail (fd, err) : 0;
@@ -246,8 +239,7 @@ __libc_fcntl (int fd, int cmd, ...)
 	    switch (cmd)
 	      {
 	      case F_GETLK64:
-		errno = ENOSYS;
-		return -1;
+		return __hurd_fail (ENOSYS);
 	      case F_SETLKW64:
 		wait = 1;
 		/* FALLTHROUGH */
@@ -255,8 +247,7 @@ __libc_fcntl (int fd, int cmd, ...)
 		return __f_setlk (fd, fl->l_type, fl->l_whence,
 				  fl->l_start, fl->l_len, wait);
 	      default:
-		errno = EINVAL;
-		return -1;
+		return __hurd_fail (EINVAL);
 	      }
 	  }
 
diff --git a/sysdeps/mach/hurd/fdopendir.c b/sysdeps/mach/hurd/fdopendir.c
index 2a152b0..33ea2f0 100644
--- a/sysdeps/mach/hurd/fdopendir.c
+++ b/sysdeps/mach/hurd/fdopendir.c
@@ -31,10 +31,7 @@ __fdopendir (int fd)
   struct hurd_fd *d = _hurd_fd_get (fd);
 
   if (d == NULL)
-    {
-      errno = EBADF;
-      return NULL;
-    }
+    return __hurd_fail (EBADF), NULL;
 
   /* Ensure that it's a directory.  */
   error_t err = HURD_FD_PORT_USE
@@ -47,10 +44,7 @@ __fdopendir (int fd)
       }));
 
   if (err)
-    {
-      errno = err;
-      return NULL;
-    }
+    return __hurd_dfail (fd, err), NULL;
 
   return _hurd_fd_opendir (d);
 }
diff --git a/sysdeps/mach/hurd/getcwd.c b/sysdeps/mach/hurd/getcwd.c
index cd3aedd..b9a6f85 100644
--- a/sysdeps/mach/hurd/getcwd.c
+++ b/sysdeps/mach/hurd/getcwd.c
@@ -69,10 +69,7 @@ __hurd_canonicalize_directory_name_internal (file_t thisdir,
   if (size <= 0)
     {
       if (buf != NULL)
-	{
-	  errno = EINVAL;
-	  return NULL;
-	}
+        return __hurd_fail (EINVAL), NULL;
 
       size = FILENAME_MAX * 4 + 1;	/* Good starting guess.  */
     }
@@ -227,10 +224,7 @@ __hurd_canonicalize_directory_name_internal (file_t thisdir,
 	  if (offset < d->d_namlen + 1)
 	    {
 	      if (orig_size > 0)
-		{
-		  errno = ERANGE;
-		  return NULL;
-		}
+		return __hurd_fail (ERANGE), NULL;
 	      else
 		{
 		  size *= 2;
diff --git a/sysdeps/mach/hurd/getegid.c b/sysdeps/mach/hurd/getegid.c
index 7f07d13..9ca56e5 100644
--- a/sysdeps/mach/hurd/getegid.c
+++ b/sysdeps/mach/hurd/getegid.c
@@ -32,21 +32,15 @@ retry:
   __mutex_lock (&_hurd_id.lock);
 
   if (err = _hurd_check_ids ())
-    {
-      errno = err;
-      egid = -1;
-    }
+    egid = __hurd_fail (err);
   else if (_hurd_id.gen.ngids >= 1)
     egid = _hurd_id.gen.gids[0];
   else if (_hurd_id.aux.ngids >= 1)
     /* We have no effective gids.  Return the real gid.  */
     egid = _hurd_id.aux.gids[0];
   else
-    {
-      /* We do not even have a real gid.  */
-      errno = EGRATUITOUS;
-      egid = -1;
-    }
+    /* We do not even have a real gid.  */
+    egid = __hurd_fail (EGRATUITOUS);
 
   __mutex_unlock (&_hurd_id.lock);
   HURD_CRITICAL_END;
diff --git a/sysdeps/mach/hurd/getentropy.c b/sysdeps/mach/hurd/getentropy.c
index adbbb78..118f898 100644
--- a/sysdeps/mach/hurd/getentropy.c
+++ b/sysdeps/mach/hurd/getentropy.c
@@ -20,6 +20,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <unistd.h>
+#include <hurd.h>
 
 /* Write LENGTH bytes of randomness starting at BUFFER.  Return 0 on
    success and -1 on failure.  */
@@ -29,10 +30,7 @@ getentropy (void *buffer, size_t length)
   /* The interface is documented to return EIO for buffer lengths
      longer than 256 bytes.  */
   if (length > 256)
-    {
-      __set_errno (EIO);
-      return -1;
-    }
+    return __hurd_fail (EIO);
 
   /* Try to fill the buffer completely.  Even with the 256 byte limit
      above, we might still receive an EINTR error (when blocking
@@ -51,12 +49,9 @@ getentropy (void *buffer, size_t length)
             return -1;
         }
       if (bytes == 0)
-        {
-          /* No more bytes available.  This should not happen under
-             normal circumstances.  */
-          __set_errno (EIO);
-          return -1;
-        }
+        /* No more bytes available.  This should not happen under
+           normal circumstances.  */
+        return __hurd_fail (EIO);
       /* Try again in case of a short read.  */
       buffer += bytes;
     }
diff --git a/sysdeps/mach/hurd/geteuid.c b/sysdeps/mach/hurd/geteuid.c
index a50c514..3548bdd 100644
--- a/sysdeps/mach/hurd/geteuid.c
+++ b/sysdeps/mach/hurd/geteuid.c
@@ -32,21 +32,15 @@ retry:
   __mutex_lock (&_hurd_id.lock);
 
   if (err = _hurd_check_ids ())
-    {
-      errno = err;
-      euid = -1;
-    }
+    euid = __hurd_fail (err);
   else if (_hurd_id.gen.nuids >= 1)
     euid = _hurd_id.gen.uids[0];
   else if (_hurd_id.aux.nuids >= 1)
     /* We have no effective uids.  Return the real uid.  */
     euid = _hurd_id.aux.uids[0];
   else
-    {
-      /* We do not even have a real uid.  */
-      errno = EGRATUITOUS;
-      euid = -1;
-    }
+    /* We do not even have a real uid.  */
+    euid = __hurd_fail (EGRATUITOUS);
 
   __mutex_unlock (&_hurd_id.lock);
   HURD_CRITICAL_END;
diff --git a/sysdeps/mach/hurd/getgid.c b/sysdeps/mach/hurd/getgid.c
index f49e592..6218307 100644
--- a/sysdeps/mach/hurd/getgid.c
+++ b/sysdeps/mach/hurd/getgid.c
@@ -32,18 +32,12 @@ retry:
   __mutex_lock (&_hurd_id.lock);
 
   if (err = _hurd_check_ids ())
-    {
-      errno = err;
-      gid = -1;
-    }
+    gid = __hurd_fail (err);
   else if (_hurd_id.aux.ngids >= 1)
     gid = _hurd_id.aux.gids[0];
   else
-    {
-      /* We do not even have a real gid.  */
-      errno = EGRATUITOUS;
-      gid = -1;
-    }
+    /* We do not even have a real gid.  */
+    gid = __hurd_fail (EGRATUITOUS);
 
   __mutex_unlock (&_hurd_id.lock);
   HURD_CRITICAL_END;
diff --git a/sysdeps/mach/hurd/getlogin.c b/sysdeps/mach/hurd/getlogin.c
index 336afae..3f1b9a6 100644
--- a/sysdeps/mach/hurd/getlogin.c
+++ b/sysdeps/mach/hurd/getlogin.c
@@ -29,10 +29,7 @@ getlogin (void)
   error_t err;
 
   if (err = __USEPORT (PROC, __proc_getlogin (port, login)))
-    {
-      errno = err;
-      return NULL;
-    }
+    return __hurd_fail (err), NULL;
 
   return login;
 }
diff --git a/sysdeps/mach/hurd/getlogin_r.c b/sysdeps/mach/hurd/getlogin_r.c
index 2e43225..c1a2f14 100644
--- a/sysdeps/mach/hurd/getlogin_r.c
+++ b/sysdeps/mach/hurd/getlogin_r.c
@@ -31,14 +31,11 @@ __getlogin_r (char *name, size_t name_len)
   error_t err;
 
   if (err = __USEPORT (PROC, __proc_getlogin (port, login)))
-    return errno = err;
+    return __hurd_fail (err), err;
 
   size_t len = __strnlen (login, sizeof login - 1) + 1;
   if (len > name_len)
-    {
-      errno = ERANGE;
-      return errno;
-    }
+    return __hurd_fail (ERANGE), ERANGE;
 
   memcpy (name, login, len);
   return 0;
diff --git a/sysdeps/mach/hurd/getrlimit.c b/sysdeps/mach/hurd/getrlimit.c
index 547d4e6..5744f67 100644
--- a/sysdeps/mach/hurd/getrlimit.c
+++ b/sysdeps/mach/hurd/getrlimit.c
@@ -28,10 +28,7 @@ __getrlimit (enum __rlimit_resource resource, struct rlimit *rlimits)
   struct rlimit lim;
 
   if (rlimits == NULL || (unsigned int) resource >= RLIMIT_NLIMITS)
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   HURD_CRITICAL_BEGIN;
   __mutex_lock (&_hurd_rlimit_lock);
diff --git a/sysdeps/mach/hurd/getuid.c b/sysdeps/mach/hurd/getuid.c
index 267cbda..fa778eb 100644
--- a/sysdeps/mach/hurd/getuid.c
+++ b/sysdeps/mach/hurd/getuid.c
@@ -32,18 +32,12 @@ retry:
   __mutex_lock (&_hurd_id.lock);
 
   if (err = _hurd_check_ids ())
-    {
-      errno = err;
-      uid = -1;
-    }
+    uid = __hurd_fail (err);
   else if (_hurd_id.aux.nuids >= 1)
     uid = _hurd_id.aux.uids[0];
   else
-    {
-      /* We do not even have a real uid.  */
-      errno = EGRATUITOUS;
-      uid = -1;
-    }
+    /* We do not even have a real uid.  */
+    uid = __hurd_fail (EGRATUITOUS);
 
   __mutex_unlock (&_hurd_id.lock);
   HURD_CRITICAL_END;
diff --git a/sysdeps/mach/hurd/i386/sigreturn.c b/sysdeps/mach/hurd/i386/sigreturn.c
index 1686734..64faa5d 100644
--- a/sysdeps/mach/hurd/i386/sigreturn.c
+++ b/sysdeps/mach/hurd/i386/sigreturn.c
@@ -84,10 +84,7 @@ __sigreturn (struct sigcontext *scp)
   struct hurd_userlink *link = (void *) &scp[1];
 
   if (__glibc_unlikely (scp == NULL || (scp->sc_mask & _SIG_CANT_MASK)))
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   ss = _hurd_self_sigstate ();
   _hurd_sigstate_lock (ss);
diff --git a/sysdeps/mach/hurd/if_index.c b/sysdeps/mach/hurd/if_index.c
index c8ad7e7..5c10da5 100644
--- a/sysdeps/mach/hurd/if_index.c
+++ b/sysdeps/mach/hurd/if_index.c
@@ -38,10 +38,7 @@ __if_nametoindex (const char *ifname)
     return 0;
 
   if (strlen (ifname) >= IFNAMSIZ)
-    {
-      __set_errno (ENODEV);
-      return 0;
-    }
+    return __hurd_fail (ENODEV), 0;
 
   strncpy (ifr.ifr_name, ifname, IFNAMSIZ);
   if (__ioctl (fd, SIOCGIFINDEX, &ifr) < 0)
@@ -49,7 +46,7 @@ __if_nametoindex (const char *ifname)
       int saved_errno = errno;
       __close (fd);
       if (saved_errno == EINVAL || saved_errno == ENOTTY)
-        __set_errno (ENOSYS);
+        __hurd_fail (ENOSYS);
       return 0;
     }
   __close (fd);
@@ -180,9 +177,9 @@ __if_indextoname (unsigned int ifindex, char ifname[IF_NAMESIZE])
       int saved_errno = errno;
       __close (fd);
       if (saved_errno == EINVAL || saved_errno == ENOTTY)
-        __set_errno (ENOSYS);
+        __hurd_fail (ENOSYS);
       else if (saved_errno == ENODEV)
-	__set_errno (ENXIO);
+	__hurd_fail (ENXIO);
       return NULL;
     }
   __close (fd);
diff --git a/sysdeps/mach/hurd/ifreq.c b/sysdeps/mach/hurd/ifreq.c
index 394d020..eec7dd8 100644
--- a/sysdeps/mach/hurd/ifreq.c
+++ b/sysdeps/mach/hurd/ifreq.c
@@ -54,7 +54,7 @@ __ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
       if (len % sizeof (struct ifreq) != 0)
 	{
 	  __munmap (data, len);
-	  errno = EGRATUITOUS;
+	  __hurd_fail (EGRATUITOUS);
 	  goto out;
 	}
       *num_ifs = len / sizeof (struct ifreq);
diff --git a/sysdeps/mach/hurd/libc_sigaction.c b/sysdeps/mach/hurd/libc_sigaction.c
index 3053c7e..748647e 100644
--- a/sysdeps/mach/hurd/libc_sigaction.c
+++ b/sysdeps/mach/hurd/libc_sigaction.c
@@ -33,10 +33,7 @@ __libc_sigaction (int sig, const struct sigaction *act,
 
   if (act != NULL && act->sa_handler != SIG_DFL
       && ((__sigmask (sig) & _SIG_CANT_MASK) || act->sa_handler == SIG_ERR))
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   /* Copy so we fault before taking locks.  */
   if (act != NULL)
diff --git a/sysdeps/mach/hurd/lseek.c b/sysdeps/mach/hurd/lseek.c
index 7b4e128..0fe20e2 100644
--- a/sysdeps/mach/hurd/lseek.c
+++ b/sysdeps/mach/hurd/lseek.c
@@ -18,6 +18,7 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <errno.h>
+#include <hurd.h>
 
 /* Seek to OFFSET on FD, starting from WHENCE.  */
 off_t
@@ -27,10 +28,7 @@ __libc_lseek (int fd, off_t offset, int whence)
   off_t res = (off_t) res64;
 
   if (sizeof res != sizeof res64 && res != res64)
-    {
-      __set_errno (EOVERFLOW);
-      return (off_t) -1;
-    }
+    return (off_t) __hurd_fail (EOVERFLOW);
 
   return res;
 }
diff --git a/sysdeps/mach/hurd/mknodat.c b/sysdeps/mach/hurd/mknodat.c
index f3ccb86..67158e1 100644
--- a/sysdeps/mach/hurd/mknodat.c
+++ b/sysdeps/mach/hurd/mknodat.c
@@ -63,10 +63,7 @@ __mknodat (int fd, const char *path, mode_t mode, dev_t dev)
       len = 0;
     }
   else
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   if (translator != NULL && ! S_ISFIFO (mode))
     {
diff --git a/sysdeps/mach/hurd/mmap64.c b/sysdeps/mach/hurd/mmap64.c
index a838afd..cafd034 100644
--- a/sysdeps/mach/hurd/mmap64.c
+++ b/sysdeps/mach/hurd/mmap64.c
@@ -19,6 +19,7 @@
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <mach/port.h>
+#include <hurd.h>
 
 /* Map addresses starting near ADDR and extending for LEN bytes.  From
    OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR
@@ -36,11 +37,8 @@ __mmap64 (void *addr, size_t len, int prot, int flags, int fd,
   vm_offset_t small_offset = (vm_offset_t) offset;
 
   if (small_offset != offset)
-    {
-      /* We cannot do this since the offset is too large.  */
-      __set_errno (EOVERFLOW);
-      return MAP_FAILED;
-    }
+    /* We cannot do this since the offset is too large.  */
+    return __hurd_fail (EOVERFLOW), MAP_FAILED;
 
   return __mmap (addr, len, prot, flags, fd, small_offset);
 }
diff --git a/sysdeps/mach/hurd/opendir.c b/sysdeps/mach/hurd/opendir.c
index cfba659..39c805bc 100644
--- a/sysdeps/mach/hurd/opendir.c
+++ b/sysdeps/mach/hurd/opendir.c
@@ -40,10 +40,7 @@ _hurd_fd_opendir (struct hurd_fd *d)
   DIR *dirp;
 
   if (d == NULL)
-    {
-      errno = EBADF;
-      return NULL;
-    }
+    return __hurd_fail (EBADF), NULL;
 
   dirp = (DIR *) malloc (sizeof (DIR));
   if (dirp == NULL)
@@ -72,12 +69,9 @@ DIR *
 __opendirat (int dfd, const char *name)
 {
   if (name[0] == '\0')
-    {
-      /* POSIX.1-1990 says an empty name gets ENOENT;
-	 but `open' might like it fine.  */
-      __set_errno (ENOENT);
-      return NULL;
-    }
+    /* POSIX.1-1990 says an empty name gets ENOENT;
+       but `open' might like it fine.  */
+    return __hurd_fail (ENOENT), NULL;
 
   int flags = O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC;
   int fd;
@@ -107,12 +101,9 @@ __opendir (const char *name)
   return __opendirat (AT_FDCWD, name);
 #else
   if (name[0] == '\0')
-    {
-      /* POSIX.1-1990 says an empty name gets ENOENT;
-	 but `open' might like it fine.  */
-      __set_errno (ENOENT);
-      return NULL;
-    }
+    /* POSIX.1-1990 says an empty name gets ENOENT;
+       but `open' might like it fine.  */
+    return __hurd_fail (ENOENT), NULL;
 
   int fd = __open (name, O_RDONLY | O_NONBLOCK | O_DIRECTORY);
   if (fd < 0)
diff --git a/sysdeps/mach/hurd/ptrace.c b/sysdeps/mach/hurd/ptrace.c
index b2efac0..97948d3 100644
--- a/sysdeps/mach/hurd/ptrace.c
+++ b/sysdeps/mach/hurd/ptrace.c
@@ -380,8 +380,7 @@ ptrace (enum __ptrace_request request, ... )
       }
 
     default:
-      errno = EINVAL;
-      return -1;
+      return __hurd_fail (EINVAL);
     }
 
   return 0;
diff --git a/sysdeps/mach/hurd/ptsname.c b/sysdeps/mach/hurd/ptsname.c
index f6ad993..06234f5 100644
--- a/sysdeps/mach/hurd/ptsname.c
+++ b/sysdeps/mach/hurd/ptsname.c
@@ -49,11 +49,8 @@ __ptsname_internal (int fd, char *buf, size_t buflen, struct stat64 *stp)
   int ttype;
 
   if (HURD_DPORT_USE (fd, __term_get_bottom_type (port, &ttype)) == 0)
-    {
-      /* get_bottom_type suceeded, this is the slave side.  */
-      errno = ENOTTY;
-      return ENOTTY;
-    }
+    /* get_bottom_type suceeded, this is the slave side.  */
+    return __hurd_fail (ENOTTY), ENOTTY;
 
   if (err = HURD_DPORT_USE (fd, __term_get_peername (port, peername)))
     {
@@ -64,10 +61,7 @@ __ptsname_internal (int fd, char *buf, size_t buflen, struct stat64 *stp)
 
   len = __strnlen (peername, sizeof peername - 1) + 1;
   if (len > buflen)
-    {
-      errno = ERANGE;
-      return ERANGE;
-    }
+    return __hurd_fail (ERANGE), ERANGE;
 
   if (stp)
     {
diff --git a/sysdeps/mach/hurd/readdir.c b/sysdeps/mach/hurd/readdir.c
index d52cfe7..bf67823 100644
--- a/sysdeps/mach/hurd/readdir.c
+++ b/sysdeps/mach/hurd/readdir.c
@@ -21,6 +21,7 @@
 #include <unistd.h>
 #include <endian.h>
 #include <assert.h>
+#include <hurd.h>
 
 /* Read a directory entry from DIRP.  */
 struct dirent *
@@ -52,10 +53,7 @@ __readdir (DIR *dirp)
 				- sizeof entry->d_ino);
   const ino_t d_ino = entry64->d_ino;
   if (d_ino != entry64->d_ino)
-    {
-      __set_errno (EOVERFLOW);
-      return NULL;
-    }
+    return __hurd_fail (EOVERFLOW), NULL;
 # if BYTE_ORDER != BIG_ENDIAN	/* We just skipped over the zero high word.  */
   entry->d_ino = d_ino;	/* ... or the nonzero low word, swap it.  */
 # endif
diff --git a/sysdeps/mach/hurd/readdir64.c b/sysdeps/mach/hurd/readdir64.c
index ceb7083..2c01ca2 100644
--- a/sysdeps/mach/hurd/readdir64.c
+++ b/sysdeps/mach/hurd/readdir64.c
@@ -29,10 +29,7 @@ __readdir64 (DIR *dirp)
   struct dirent64 *dp;
 
   if (dirp == NULL)
-    {
-      errno = EINVAL;
-      return NULL;
-    }
+    return __hurd_fail (EINVAL), NULL;
 
   __libc_lock_lock (dirp->__lock);
 
diff --git a/sysdeps/mach/hurd/readdir64_r.c b/sysdeps/mach/hurd/readdir64_r.c
index 4f4252c2..fdfe498 100644
--- a/sysdeps/mach/hurd/readdir64_r.c
+++ b/sysdeps/mach/hurd/readdir64_r.c
@@ -31,10 +31,7 @@ __readdir64_r (DIR *dirp, struct dirent64 *entry, struct dirent64 **result)
   error_t err = 0;
 
   if (dirp == NULL)
-    {
-      errno = EINVAL;
-      return errno;
-    }
+    return __hurd_fail (EINVAL), EINVAL;
 
   __libc_lock_lock (dirp->__lock);
 
diff --git a/sysdeps/mach/hurd/sendmsg.c b/sysdeps/mach/hurd/sendmsg.c
index 3c9cdc4..7f86f60 100644
--- a/sysdeps/mach/hurd/sendmsg.c
+++ b/sysdeps/mach/hurd/sendmsg.c
@@ -82,10 +82,7 @@ __libc_sendmsg (int fd, const struct msghdr *message, int flags)
 	{
 	  err = __vm_allocate (__mach_task_self (), &data.addr, len, 1);
 	  if (err)
-	    {
-	      __set_errno (err);
-	      return -1;
-	    }
+	    return __hurd_fail (err);
 	  dealloc = 1;
 	}
       else
diff --git a/sysdeps/mach/hurd/setrlimit.c b/sysdeps/mach/hurd/setrlimit.c
index 7dc62e1..f57439f 100644
--- a/sysdeps/mach/hurd/setrlimit.c
+++ b/sysdeps/mach/hurd/setrlimit.c
@@ -30,10 +30,7 @@ __setrlimit (enum __rlimit_resource resource, const struct rlimit *rlimits)
   struct rlimit lim;
 
   if (rlimits == NULL || (unsigned int) resource >= RLIMIT_NLIMITS)
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   lim = *rlimits;
 
diff --git a/sysdeps/mach/hurd/sigaltstack.c b/sysdeps/mach/hurd/sigaltstack.c
index 8d5a2a8..7431a11 100644
--- a/sysdeps/mach/hurd/sigaltstack.c
+++ b/sysdeps/mach/hurd/sigaltstack.c
@@ -42,8 +42,7 @@ __sigaltstack (const stack_t *argss, stack_t *oss)
     {
       /* Can't disable a stack that is in use.  */
       __spin_unlock (&s->lock);
-      errno = EINVAL;
-      return -1;
+      return __hurd_fail (EINVAL);
     }
 
   old = s->sigaltstack;
diff --git a/sysdeps/mach/hurd/sigpending.c b/sysdeps/mach/hurd/sigpending.c
index 59078a3..6a8d3b8 100644
--- a/sysdeps/mach/hurd/sigpending.c
+++ b/sysdeps/mach/hurd/sigpending.c
@@ -30,10 +30,7 @@ sigpending (sigset_t *set)
   sigset_t pending;
 
   if (set == NULL)
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   ss = _hurd_self_sigstate ();
   _hurd_sigstate_lock (ss);
diff --git a/sysdeps/mach/hurd/sigprocmask.c b/sysdeps/mach/hurd/sigprocmask.c
index c7c5dfc..d530951 100644
--- a/sysdeps/mach/hurd/sigprocmask.c
+++ b/sysdeps/mach/hurd/sigprocmask.c
@@ -58,8 +58,7 @@ __sigprocmask (int how, const sigset_t *set, sigset_t *oset)
 
 	default:
 	  _hurd_sigstate_unlock (ss);
-	  errno = EINVAL;
-	  return -1;
+	  return __hurd_fail (EINVAL);
 	}
 
       ss->blocked &= ~_SIG_CANT_MASK;
diff --git a/sysdeps/mach/hurd/sigsuspend.c b/sysdeps/mach/hurd/sigsuspend.c
index 85f3e78..2dec3f9 100644
--- a/sysdeps/mach/hurd/sigsuspend.c
+++ b/sysdeps/mach/hurd/sigsuspend.c
@@ -81,8 +81,7 @@ __sigsuspend (const sigset_t *set)
   /* We've been interrupted!  And a good thing, too.
      Otherwise we'd never return.
      That's right; this function always returns an error.  */
-  errno = EINTR;
-  return -1;
+  return __hurd_fail (EINTR);
 }
 libc_hidden_def (__sigsuspend)
 weak_alias (__sigsuspend, sigsuspend)
diff --git a/sysdeps/mach/hurd/spawni.c b/sysdeps/mach/hurd/spawni.c
index f45311a..5e05308 100644
--- a/sysdeps/mach/hurd/spawni.c
+++ b/sysdeps/mach/hurd/spawni.c
@@ -216,8 +216,7 @@ __spawni (pid_t *pid, const char *file,
 				MACH_PORT_RIGHT_SEND, +1);
 	  return dtable[fd];
 	}
-      errno = EBADF;
-      return MACH_PORT_NULL;
+      return __hurd_fail (EBADF), MACH_PORT_NULL;
     }
   inline error_t child_lookup (const char *file, int oflag, mode_t mode,
 			       file_t *result)
diff --git a/sysdeps/mach/hurd/statconv.c b/sysdeps/mach/hurd/statconv.c
index 306dde3..ae3950f 100644
--- a/sysdeps/mach/hurd/statconv.c
+++ b/sysdeps/mach/hurd/statconv.c
@@ -18,6 +18,7 @@
 
 #include <errno.h>
 #include <sys/stat.h>
+#include <hurd.h>
 
 static inline int
 stat64_conv (struct stat *buf, const struct stat64 *buf64)
@@ -55,10 +56,7 @@ stat64_conv (struct stat *buf, const struct stat64 *buf64)
 	  && buf->st_size != buf64->st_size)
       || (sizeof buf->st_blocks != sizeof buf64->st_blocks
 	  && buf->st_blocks != buf64->st_blocks))
-    {
-      __set_errno (EOVERFLOW);
-      return -1;
-    }
+    return __hurd_fail (EOVERFLOW);
 
   return 0;
 }
diff --git a/sysdeps/mach/hurd/statfsconv.c b/sysdeps/mach/hurd/statfsconv.c
index f67d6b9..8a2051c 100644
--- a/sysdeps/mach/hurd/statfsconv.c
+++ b/sysdeps/mach/hurd/statfsconv.c
@@ -18,6 +18,7 @@
 
 #include <sys/statfs.h>
 #include <errno.h>
+#include <hurd.h>
 
 static inline int
 statfs64_conv (struct statfs *buf, const struct statfs64 *buf64)
@@ -25,10 +26,7 @@ statfs64_conv (struct statfs *buf, const struct statfs64 *buf64)
 # define DO(memb)							      \
   buf->memb = buf64->memb;						      \
   if (sizeof buf->memb != sizeof buf64->memb && buf->memb != buf64->memb)     \
-    {									      \
-      __set_errno (EOVERFLOW);						      \
-      return -1;							      \
-    }
+    return __hurd_fail (EOVERFLOW);
 
   DO (f_type);
   DO (f_bsize);
diff --git a/sysdeps/mach/hurd/ttyname_r.c b/sysdeps/mach/hurd/ttyname_r.c
index 35a657b..8fd05a8 100644
--- a/sysdeps/mach/hurd/ttyname_r.c
+++ b/sysdeps/mach/hurd/ttyname_r.c
@@ -41,10 +41,7 @@ __ttyname_r (int fd, char *buf, size_t buflen)
 
   len = strlen (nodename) + 1;
   if (len > buflen)
-    {
-      errno = ERANGE;
-      return errno;
-    }
+    return __hurd_fail (ERANGE), ERANGE;
 
   memcpy (buf, nodename, len);
   return 0;
diff --git a/sysdeps/mach/hurd/unlinkat.c b/sysdeps/mach/hurd/unlinkat.c
index 5197a30..cdc2774 100644
--- a/sysdeps/mach/hurd/unlinkat.c
+++ b/sysdeps/mach/hurd/unlinkat.c
@@ -33,10 +33,7 @@ __unlinkat (int fd, const char *name, int flag)
   const char *file;
 
   if ((flag &~ AT_REMOVEDIR) != 0)
-    {
-      __set_errno (EINVAL);
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   dir = __directory_name_split_at (fd, name, (char **) &file);
   if (dir == MACH_PORT_NULL)
diff --git a/sysdeps/mach/hurd/waitid.c b/sysdeps/mach/hurd/waitid.c
index 7bbbbdb..3a41697 100644
--- a/sysdeps/mach/hurd/waitid.c
+++ b/sysdeps/mach/hurd/waitid.c
@@ -52,8 +52,7 @@ __waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
       break;
     default:
     invalid:
-      __set_errno (EINVAL);
-      return -1;
+      return __hurd_fail (EINVAL);
     }
 
   /* Technically we're supposed to return EFAULT if infop is bogus,
@@ -62,10 +61,7 @@ __waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
      We just check for a null pointer. */
 
   if (infop == NULL)
-    {
-      __set_errno (EFAULT);
-      return -1;
-    }
+    return __hurd_fail (EFAULT);
 
   cancel_oldtype = LIBC_CANCEL_ASYNC();
 #if HURD_INTERFACE_VERSION >= 20201227
diff --git a/sysdeps/mach/hurd/x86_64/sigreturn.c b/sysdeps/mach/hurd/x86_64/sigreturn.c
index 5d3a4d3..f37ae11 100644
--- a/sysdeps/mach/hurd/x86_64/sigreturn.c
+++ b/sysdeps/mach/hurd/x86_64/sigreturn.c
@@ -79,10 +79,7 @@ __sigreturn (struct sigcontext *scp)
   struct hurd_userlink *link = (void *) &scp[1];
 
   if (__glibc_unlikely (scp == NULL || (scp->sc_mask & _SIG_CANT_MASK)))
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
   ss = _hurd_self_sigstate ();
   _hurd_sigstate_lock (ss);