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drm-shim: Use anonymous file for file override

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Using a pipe might mean that either the read or write call can block,
most likely deadlocking the calling process. Instead, write the contents
in an anonymous file when the file is opened to be read back.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18341>
This commit is contained in:
Joshua Watt 2022-08-31 08:15:29 -05:00 • committed by Marge Bot
parent 730834aa6b
commit e0c3324695
1 changed files with 5 additions and 5 deletions
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10
src/drm-shim/drm_shim.c
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@ -48,6 +48,7 @@
#include <c11/threads.h>
#include <drm-uapi/drm.h>
#include "util/anon_file.h"
#include "util/set.h"
#include "util/u_debug.h"
#include "drm_shim.h"
@ -297,12 +298,11 @@ static int file_override_open(const char *path)
{
for (int i = 0; i < file_overrides_count; i++) {
if (strcmp(file_overrides[i].path, path) == 0) {
int fds[2];
pipe(fds);
write(fds[1], file_overrides[i].contents,
int fd = os_create_anonymous_file(0, "shim file");
write(fd, file_overrides[i].contents,
strlen(file_overrides[i].contents));
close(fds[1]);
return fds[0];
lseek(fd, 0, SEEK_SET);
return fd;
}
}