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Linux version for non-linux systems

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On non-linux systems, uts.version provides the version of that
specific kernel (FreeBSD or Hurd version, for example) and not the
emulated procfs pseudo version.

On those systems we need to directly read /proc/version and parse the
string.  This change replaces Debian patches gnu-kbsd-version and
complain_unmounted_proc patches.
This commit is contained in:
Craig Small 2012-01-09 21:57:44 +11:00
parent a909f6e917
commit 3c2377ca15
1 changed files with 24 additions and 1 deletions
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25
proc/version.c
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@ -28,20 +28,43 @@ void display_version(void) {
int linux_version_code; int linux_version_code;
void init_Linux_version(void) { void init_Linux_version(void) {
static struct utsname uts;
int x = 0, y = 0, z = 0; /* cleared in case sscanf() < 3 */ int x = 0, y = 0, z = 0; /* cleared in case sscanf() < 3 */
int version_string_depth; int version_string_depth;
#ifdef __linux__
static struct utsname uts;
if (uname(&uts) == -1) /* failure implies impending death */ if (uname(&uts) == -1) /* failure implies impending death */
exit(1); exit(1);
version_string_depth = sscanf(uts.release, "%d.%d.%d", &x, &y, &z); version_string_depth = sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
#else
FILE *fp;
char buf[256];
if ( (fp=fopen("/proc/version","r")) == NULL) {
fprintf(stderr, "Cannot find /proc/version - is /proc mounted?\n");
exit(1);
}
if (fgets(buf, 256, fp) == NULL) {
fprintf(stderr, "Cannot read kernel version from /proc/version\n");
fclose(fp);
exit(1);
}
fclose(fp);
version_string_depth = sscanf(buf, "Linux version %d.%d.%d", &x, &y, &z);
#endif /* __linux__ */
if ((version_string_depth < 2) || /* Non-standard for all known kernels */ if ((version_string_depth < 2) || /* Non-standard for all known kernels */
((version_string_depth < 3) && (x < 3))) /* Non-standard for 2.x.x kernels */ ((version_string_depth < 3) && (x < 3))) /* Non-standard for 2.x.x kernels */
#ifdef __linux__
fprintf(stderr, /* *very* unlikely to happen by accident */ fprintf(stderr, /* *very* unlikely to happen by accident */
"Non-standard uts for running kernel:\n" "Non-standard uts for running kernel:\n"
"release %s=%d.%d.%d gives version code %d\n", "release %s=%d.%d.%d gives version code %d\n",
uts.release, x, y, z, LINUX_VERSION(x,y,z)); uts.release, x, y, z, LINUX_VERSION(x,y,z));
#else
"%s=%d.%d.%d gives version code %d\n",
buf, x, y, z, LINUX_VERSION(x,y,z));
#endif /* __linux__ */
linux_version_code = LINUX_VERSION(x, y, z); linux_version_code = LINUX_VERSION(x, y, z);
} }