monitor: Report errors from monitor_fdset_dup_fd_add

I'm keeping the EACCES because callers expect to be able to look at
errno.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

4 files changed, 12 insertions, 12 deletions

diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
index fd9b3f5..c3740ec 100644
--- a/include/monitor/monitor.h
+++ b/include/monitor/monitor.h
@@ -51,7 +51,7 @@ int monitor_read_password(MonitorHMP *mon, ReadLineFunc *readline_func,
 
 AddfdInfo *monitor_fdset_add_fd(int fd, bool has_fdset_id, int64_t fdset_id,
                                 const char *opaque, Error **errp);
-int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags);
+int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags, Error **errp);
 void monitor_fdset_dup_fd_remove(int dup_fd);
 
 void monitor_register_hmp(const char *name, bool info,
diff --git a/monitor/fds.c b/monitor/fds.c
index e7619a6..d8c6b39 100644
--- a/monitor/fds.c
+++ b/monitor/fds.c
@@ -409,9 +409,10 @@ AddfdInfo *monitor_fdset_add_fd(int fd, bool has_fdset_id, int64_t fdset_id,
     return fdinfo;
 }
 
-int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags)
+int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags, Error **errp)
 {
 #ifdef _WIN32
+    error_setg(errp, "Platform does not support fd passing (fdset)");
     return -ENOENT;
 #else
     MonFdset *mon_fdset;
@@ -431,6 +432,8 @@ int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags)
         QLIST_FOREACH(mon_fdset_fd, &mon_fdset->fds, next) {
             mon_fd_flags = fcntl(mon_fdset_fd->fd, F_GETFL);
             if (mon_fd_flags == -1) {
+                error_setg(errp, "Failed to read file status flags for fd=%d",
+                           mon_fdset_fd->fd);
                 return -1;
             }
 
@@ -442,11 +445,15 @@ int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags)
 
         if (fd == -1) {
             errno = EACCES;
+            error_setg(errp,
+                       "Failed to find file descriptor with matching flags=0x%x",
+                       flags);
             return -1;
         }
 
         dup_fd = qemu_dup_flags(fd, flags);
         if (dup_fd == -1) {
+            error_setg(errp, "Failed to dup() given file descriptor fd=%d", fd);
             return -1;
         }
 
@@ -456,6 +463,7 @@ int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags)
         return dup_fd;
     }
 
+    error_setg(errp, "Failed to find fdset /dev/fdset/%" PRId64, fdset_id);
     errno = ENOENT;
     return -1;
 #endif
diff --git a/stubs/fdset.c b/stubs/fdset.c
index 389e368..2950fd9 100644
--- a/stubs/fdset.c
+++ b/stubs/fdset.c
@@ -3,7 +3,7 @@
 #include "monitor/monitor.h"
 #include "../monitor/monitor-internal.h"
 
-int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags)
+int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags, Error **errp)
 {
     errno = ENOSYS;
     return -1;
diff --git a/util/osdep.c b/util/osdep.c
index 756de9a..5bbfdfa 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -310,7 +310,6 @@ qemu_open_internal(const char *name, int flags, mode_t mode, Error **errp)
     /* Attempt dup of fd from fd set */
     if (strstart(name, "/dev/fdset/", &fdset_id_str)) {
         int64_t fdset_id;
-        int dupfd;
 
         fdset_id = qemu_parse_fdset(fdset_id_str);
         if (fdset_id == -1) {
@@ -319,14 +318,7 @@ qemu_open_internal(const char *name, int flags, mode_t mode, Error **errp)
             return -1;
         }
 
-        dupfd = monitor_fdset_dup_fd_add(fdset_id, flags);
-        if (dupfd == -1) {
-            error_setg_errno(errp, errno, "Could not dup FD for %s flags %x",
-                             name, flags);
-            return -1;
-        }
-
-        return dupfd;
+        return monitor_fdset_dup_fd_add(fdset_id, flags, errp);
     }
 #endif