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util/drm: make portable by avoiding struct dirent d_type

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Given this isn't perforance critical at all lets avoid the non-portable
d_type and use fstat instead to check whenever the file is a chardev.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reported-by: David Carlier <devnexen@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200703145614.16684-10-peter.maydell@linaro.org
Message-id: 20200701180302.14821-1-kraxel@redhat.com
[PMM: fixed comment style; tweaked subject line]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Gerd Hoffmann 2020-07-13 14:36:10 +01:00 committed by Peter Maydell
parent 2b9b9e7010
commit 0b823cb07e
1 changed files with 14 additions and 5 deletions
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19
util/drm.c
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@ -24,7 +24,8 @@ int qemu_drm_rendernode_open(const char *rendernode)
{
DIR *dir;
struct dirent *e;
int r, fd;
struct stat st;
int r, fd, ret;
char *p;
if (rendernode) {
@ -38,10 +39,6 @@ int qemu_drm_rendernode_open(const char *rendernode)
fd = -1;
while ((e = readdir(dir))) {
if (e->d_type != DT_CHR) {
continue;
}
if (strncmp(e->d_name, "renderD", 7)) {
continue;
}
@ -53,6 +50,18 @@ int qemu_drm_rendernode_open(const char *rendernode)
g_free(p);
continue;
}
/*
* prefer fstat() over checking e->d_type == DT_CHR for
* portability reasons
*/
ret = fstat(r, &st);
if (ret < 0 || (st.st_mode & S_IFMT) != S_IFCHR) {
close(r);
g_free(p);
continue;
}
fd = r;
g_free(p);
break;