110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/lnx_kmod.c,v 3.6 2001/10/31 22:50:30 tsi Exp $ */
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include "xf86_OSlib.h"
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#include "xf86.h"
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#define MODPROBE_PATH_FILE "/proc/sys/kernel/modprobe"
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#define MAX_PATH 1024
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#if 0
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/* XFree86 #defines execl to be the xf86execl() function which does
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* a fork AND exec. We don't want that. We want the regular,
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* standard execl().
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*/
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#ifdef execl
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#undef execl
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#endif
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#endif
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/*
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* Load a Linux kernel module.
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* This is used by the DRI/DRM to load a DRM kernel module when
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* the X server starts. It could be used for other purposes in the future.
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* Input:
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* modName - name of the kernel module (Ex: "tdfx")
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* Return:
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* 0 for failure, 1 for success
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*/
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int
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xf86LoadKernelModule(const char *modName)
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{
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char mpPath[MAX_PATH] = "";
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int fd = -1, status, n;
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pid_t pid;
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/* get the path to the modprobe program */
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fd = open(MODPROBE_PATH_FILE, O_RDONLY);
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if (fd >= 0) {
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int count = read(fd, mpPath, MAX_PATH - 1);
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if (count <= 0) {
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mpPath[0] = 0;
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}
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else if (mpPath[count - 1] == '\n') {
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mpPath[count - 1] = 0; /* replaces \n with \0 */
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}
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close(fd);
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/* if this worked, mpPath will be "/sbin/modprobe" or similar. */
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}
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if (mpPath[0] == 0) {
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/* we failed to get the path from the system, use a default */
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strcpy(mpPath, "/sbin/modprobe");
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}
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/* now fork/exec the modprobe command */
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/*
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* It would be good to capture stdout/stderr so that it can be directed
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* to the log file. modprobe errors currently are missing from the log
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* file.
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*/
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switch (pid = fork()) {
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case 0: /* child */
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/* change real/effective user ID to 0/0 as we need to
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* preinstall agpgart module for some DRM modules
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*/
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if (setreuid(0,0)) {
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xf86Msg(X_WARNING,"LoadKernelModule: "
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"Setting of real/effective user Id to 0/0 failed");
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}
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setenv("PATH","/sbin",1);
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n = execl(mpPath, "modprobe", modName, NULL);
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xf86Msg(X_WARNING,"LoadKernelModule %s\n",strerror(errno));
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exit(EXIT_FAILURE); /* if we get here the child's exec failed */
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break;
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case -1: /* fork failed */
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return 0;
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default: /* fork worked */
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{
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/* XXX we loop over waitpid() because it sometimes fails on
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* the first attempt. Don't know why!
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*/
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int count = 0, p;
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do {
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p = waitpid(pid, &status, 0);
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} while (p == -1 && count++ < 4);
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if (p == -1) {
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return 0;
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}
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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return 1; /* success! */
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}
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else {
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return 0;
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}
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}
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}
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/* never get here */
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return 0;
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}
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