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Mon Oct 12 00:42:30 CEST 1998: Martin Schulze <joey@infodrom.north.de>

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Modified CheckVersion()
      . Use shift to decode the kernel version
      . Compare integers of kernel version
      . extract major.minor.patch from utsname.release via sscanf()
      The reason lays in possible use of kernel flavours which
      modify utsname.release but no the Version_ symbol.
This commit is contained in:
Joey Schulze 1998-10-12 16:39:49 +00:00
parent 6abd86e133
commit b0720eb617
1 changed files with 27 additions and 5 deletions
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32
ksym.c
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@ -91,6 +91,14 @@
* Modified loop for detecting the correct system map. Now it won't
* stop if a file has been found but doesn't contain the correct map.
* Special thanks go go Mark Simon Phillips for the hint.
*
* Mon Oct 12 00:42:30 CEST 1998: Martin Schulze <joey@infodrom.north.de>
* Modified CheckVersion()
* . Use shift to decode the kernel version
* . Compare integers of kernel version
* . extract major.minor.patch from utsname.release via sscanf()
* The reason lays in possible use of kernel flavours which
* modify utsname.release but no the Version_ symbol.
*/
@ -400,7 +408,10 @@ static int CheckVersion(version)
minor,
patch;
#ifndef TESTING
int kvnum;
auto struct utsname utsname;
#endif
static char *prefix = { "Version_" };
@ -420,10 +431,9 @@ static int CheckVersion(version)
* parts.
*/
vnum = atoi(version + strlen(prefix));
major = vnum / 65536;
vnum -= (major * 65536);
minor = vnum / 256;
patch = vnum - (minor * 256);
patch = vnum & 0x000000FF;
minor = (vnum >> 8) & 0x000000FF;
major = (vnum >> 16) & 0x000000FF;
if ( debugging )
fprintf(stderr, "Version string = %s, Major = %d, " \
"Minor = %d, Patch = %d.\n", version +
@ -431,6 +441,7 @@ static int CheckVersion(version)
patch);
sprintf(vstring, "%d.%d.%d", major, minor, patch);
#ifndef TESTING
/*
* We should now have the version string in the vstring variable in
* the same format that it is stored in by the kernel. We now
@ -447,11 +458,22 @@ static int CheckVersion(version)
fprintf(stderr, "Comparing kernel %s with symbol table %s.\n",\
utsname.release, vstring);
if ( sscanf (utsname.release, "%d.%d.%d", &major, &minor, &patch) < 3 )
{
Syslog(LOG_ERR, "Kernel send bogus release string `%s'.",
utsname.release);
return(0);
}
/* Compute the version code from data sent by the kernel */
kvnum = (major << 16) | (minor << 8) | patch;
/* Failure. */
if ( strcmp(vstring, utsname.release) != 0 )
if ( vnum != kvnum )
return(-1);
/* Success. */
#endif
return(1);
}