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drm-shim: apply file overrides for open

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loader_get_pci_driver calls os_read_file on linux to get the pci id, and
os_read_file uses open instead of fopen.

This allows loader_get_pci_driver to work rather than falling back to
loader_get_kernel_driver_name.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22951>
This commit is contained in:
Chia-I Wu 2023-05-10 11:27:42 -07:00 • committed by Marge Bot
parent e169a402a8
commit 0b6283e2e6
1 changed files with 19 additions and 6 deletions
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25
src/drm-shim/drm_shim.c
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@ -293,11 +293,8 @@ static bool hide_drm_device_path(const char *path)
return false;
}
/* Override libdrm's reading of various sysfs files for device enumeration. */
PUBLIC FILE *fopen(const char *path, const char *mode)
static int file_override_open(const char *path)
{
init_shim();
for (int i = 0; i < file_overrides_count; i++) {
if (strcmp(file_overrides[i].path, path) == 0) {
int fds[2];
@ -305,10 +302,22 @@ PUBLIC FILE *fopen(const char *path, const char *mode)
write(fds[1], file_overrides[i].contents,
strlen(file_overrides[i].contents));
close(fds[1]);
return fdopen(fds[0], "r");
return fds[0];
}
}
return -1;
}
/* Override libdrm's reading of various sysfs files for device enumeration. */
PUBLIC FILE *fopen(const char *path, const char *mode)
{
init_shim();
int fd = file_override_open(path);
if (fd >= 0)
return fdopen(fd, "r");
return real_fopen(path, mode);
}
PUBLIC FILE *fopen64(const char *path, const char *mode)
@ -324,6 +333,10 @@ PUBLIC int open(const char *path, int flags, ...)
mode_t mode = va_arg(ap, mode_t);
va_end(ap);
int fd = file_override_open(path);
if (fd >= 0)
return fd;
if (hide_drm_device_path(path)) {
errno = ENOENT;
return -1;
@ -332,7 +345,7 @@ PUBLIC int open(const char *path, int flags, ...)
if (strcmp(path, render_node_path) != 0)
return real_open(path, flags, mode);
int fd = real_open("/dev/null", O_RDWR, 0);
fd = real_open("/dev/null", O_RDWR, 0);
drm_shim_fd_register(fd, NULL);