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>

5 files changed, 14 insertions, 36 deletions

diff --git a/hurd/alloc-fd.c b/hurd/alloc-fd.c
index 60c8b00..4edc742 100644
--- a/hurd/alloc-fd.c
+++ b/hurd/alloc-fd.c
@@ -34,10 +34,7 @@ _hurd_alloc_fd (int *fd, int first_fd)
   long int rlimit;
 
   if (first_fd < 0)
-    {
-      errno = EINVAL;
-      return NULL;
-    }
+    return __hurd_fail (EINVAL), NULL;
 
   crit = _hurd_critical_section_lock ();
 
@@ -99,7 +96,7 @@ _hurd_alloc_fd (int *fd, int first_fd)
 	  if (size * sizeof (*_hurd_dtable) < size)
 	    {
 	      /* Integer overflow! */
-	      errno = ENOMEM;
+	      __hurd_fail (ENOMEM);
 	      goto out;
 	    }
 
@@ -124,13 +121,13 @@ _hurd_alloc_fd (int *fd, int first_fd)
 	      goto search;
 	    }
 	  else
-	    errno = ENOMEM;
+	    __hurd_fail (ENOMEM);
 	}
       else
-	errno = EMFILE;
+	__hurd_fail (EMFILE);
     }
   else
-    errno = EINVAL;		/* Bogus FIRST_FD value.  */
+    __hurd_fail (EINVAL);	/* Bogus FIRST_FD value.  */
 
  out:
   __mutex_unlock (&_hurd_dtable_lock);
diff --git a/hurd/fopenport.c b/hurd/fopenport.c
index be6aa30..a1efc54 100644
--- a/hurd/fopenport.c
+++ b/hurd/fopenport.c
@@ -126,10 +126,7 @@ __fopenport (mach_port_t port, const char *mode)
 
   /* Check the access mode.  */
   if ((pflags & needflags) != needflags)
-    {
-      errno = EBADF;
-      return NULL;
-    }
+    return __hurd_fail (EBADF), NULL;
 
   return fopencookie ((void *) (uintptr_t) port,
                       mode, funcsio);
diff --git a/hurd/getdport.c b/hurd/getdport.c
index 2bccc59..27fc41f 100644
--- a/hurd/getdport.c
+++ b/hurd/getdport.c
@@ -35,18 +35,12 @@ __getdport (int fd)
      so we don't bother allocating a real table.  */
 
   if (_hurd_init_dtable == NULL)
-    {
-      /* Never had a descriptor table.  */
-      errno = EBADF;
-      return MACH_PORT_NULL;
-    }
+    /* Never had a descriptor table.  */
+    return __hurd_fail (EBADF), MACH_PORT_NULL;
 
   if (fd < 0 || (unsigned int) fd > _hurd_init_dtablesize
       || _hurd_init_dtable[fd] == MACH_PORT_NULL)
-    {
-      errno = EBADF;
-      return MACH_PORT_NULL;
-    }
+    return __hurd_fail (EBADF), MACH_PORT_NULL;
   else
     {
       __mach_port_mod_refs (__mach_task_self (), _hurd_init_dtable[fd],
diff --git a/hurd/hurdselect.c b/hurd/hurdselect.c
index 9630cae..9402763 100644
--- a/hurd/hurdselect.c
+++ b/hurd/hurdselect.c
@@ -71,10 +71,7 @@ _hurd_select (int nfds,
   struct hurd_sigstate *ss = NULL;
 
   if (nfds < 0 || (pollfds == NULL && nfds > FD_SETSIZE))
-    {
-      errno = EINVAL;
-      return -1;
-    }
+    return __hurd_fail (EINVAL);
 
 #define IO_SELECT_REPLY_MSGID (21012 + 100) /* XXX */
 #define IO_SELECT_TIMEOUT_REPLY_MSGID (21031 + 100) /* XXX */
@@ -86,10 +83,7 @@ _hurd_select (int nfds,
       struct timespec now;
 
       if (timeout->tv_sec < 0 || ! valid_nanoseconds (timeout->tv_nsec))
-	{
-	  errno = EINVAL;
-	  return -1;
-	}
+	return __hurd_fail (EINVAL);
 
       err = __clock_gettime (CLOCK_REALTIME, &now);
       if (err)
@@ -281,8 +275,7 @@ _hurd_select (int nfds,
 	{
 	  if (sigmask)
 	    __sigprocmask (SIG_SETMASK, &oset, NULL);
-	  errno = EBADF;
-	  return -1;
+	  return __hurd_fail (EBADF);
 	}
 
       if (nfds > _hurd_dtablesize)
diff --git a/hurd/hurdsock.c b/hurd/hurdsock.c
index 58c27fe..1d04047 100644
--- a/hurd/hurdsock.c
+++ b/hurd/hurdsock.c
@@ -48,10 +48,7 @@ _hurd_socket_server (int domain, int dead)
   socket_t server;
 
   if (domain < 0)
-    {
-      errno = EAFNOSUPPORT;
-      return MACH_PORT_NULL;
-    }
+    return __hurd_fail (EAFNOSUPPORT), MACH_PORT_NULL;
 
 retry:
   HURD_CRITICAL_BEGIN;
@@ -99,7 +96,7 @@ retry:
 
   if (server == MACH_PORT_NULL && errno == ENOENT)
     /* If the server node is absent, we don't support that protocol.  */
-    errno = EAFNOSUPPORT;
+    __hurd_fail (EAFNOSUPPORT);
 
   __mutex_unlock (&lock);
   HURD_CRITICAL_END;