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qemu-char: Print strerror message on failure

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The only way for chardev drivers to communicate an error was to return a NULL
pointer, which resulted in an error message that said _that_ something went
wrong, but not _why_.

This patch changes the interface to return 0/-errno and updates
qemu_chr_open_opts to use strerror to display a more helpful error message.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Kevin Wolf 2011-06-01 13:29:11 +02:00 • committed by Anthony Liguori
parent 84682834eb
commit 6e1db57b2a
8 changed files with 117 additions and 83 deletions
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5
hw/msmouse.c
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@ -64,7 +64,7 @@ static void msmouse_chr_close (struct CharDriverState *chr)
qemu_free (chr);
}
CharDriverState *qemu_chr_open_msmouse(QemuOpts *opts)
int qemu_chr_open_msmouse(QemuOpts *opts, CharDriverState **_chr)
{
CharDriverState *chr;
@ -74,5 +74,6 @@ CharDriverState *qemu_chr_open_msmouse(QemuOpts *opts)
qemu_add_mouse_event_handler(msmouse_event, chr, 0, "QEMU Microsoft Mouse");
return chr;
*_chr = chr;
return 0;
}