Getting the OS version in Mac OS X using standard C
Using the hint from @uchuugaka in the comment on the answer by @McUsr, I wrote a function that seems to work. I'm not saying it's better than any other answer.
/*
* Structure for MacOS version number
*/
typedef struct macos_version_str
{
ushort major;
ushort minor;
ushort point;
} macos_type;
/****************************************************************************
*
* Determine the MacOS version.
*
* Parameters:
* version_struct: (pointer to) macos_version structure to be filled in.
*
* Return value:
* 0: no error.
*
****************************************************************************/
static int get_macos_version ( macos_type *version_struct )
{
char os_temp [20] = "";
char *os_temp_ptr = os_temp;
size_t os_temp_len = sizeof(os_temp);
size_t os_temp_left = 0;
int rslt = 0;
version_struct->major = 0;
version_struct->minor = 0;
version_struct->point = 0;
rslt = sysctlbyname ( "kern.osproductversion", os_temp, &os_temp_len, NULL, 0 );
if ( rslt != 0 )
{
fprintf ( stderr,
"sysctlbyname() returned %d error (%d): %s",
rslt, errno, strerror(errno));
return ( rslt );
}
os_temp_left = os_temp_len; /* length of string returned */
int temp = atoi ( os_temp_ptr );
version_struct->major = temp;
version_struct->major = atoi ( os_temp_ptr );
while ( os_temp_left > 0 && *os_temp_ptr != '.' )
{
os_temp_left--;
os_temp_ptr++;
}
os_temp_left--;
os_temp_ptr++;
version_struct->minor = atoi ( os_temp_ptr );
while ( os_temp_left > 0 && *os_temp_ptr != '.' )
{
os_temp_left--;
os_temp_ptr++;
}
os_temp_left--;
os_temp_ptr++;
version_struct->point = atoi ( os_temp_ptr );
fprintf ( stderr, "Calculated OS Version: %d.%d.%d", version_struct->major, version_struct->minor, version_struct->point );
if ( version_struct->major == 0 ||
version_struct->minor == 0 ||
version_struct->point == 0 )
{
fprintf ( stderr, "Unable to parse MacOS version string %s", os_temp );
return ( -2 );
}
return 0;
}
Here is one with "less work", good enough for home projects (statically allocated buffers, ignoring errors). Works for me in OS X 10.11.1.
#include <stdio.h>
/*!
@brief Returns one component of the OS version
@param component 1=major, 2=minor, 3=bugfix
*/
int GetOSVersionComponent(int component) {
char cmd[64] ;
sprintf(
cmd,
"sw_vers -productVersion | awk -F '.' '{print $%d}'",
component
) ;
FILE* stdoutFile = popen(cmd, "r") ;
int answer = 0 ;
if (stdoutFile) {
char buff[16] ;
char *stdout = fgets(buff, sizeof(buff), stdoutFile) ;
pclose(stdoutFile) ;
sscanf(stdout, "%d", &answer) ;
}
return answer ;
}
int main(int argc, const char * argv[]) {
printf(
"Your OS version is: %d.%d.%d\n",
GetOSVersionComponent(1),
GetOSVersionComponent(2),
GetOSVersionComponent(3)
) ;
return 0 ;
}
The code below should work in the foreseeable future for figuring out the current version of Mac Os X.
/* McUsr put this together, and into public domain,
without any guarrantees about anything,
but the statement that it works for me.
*/
#if 1 == 1
#define TESTING
#endif
#include <sys/param.h>
#include <sys/sysctl.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
struct osver {
int minor;
int sub;
} ;
typedef struct osver osxver ;
void macosx_ver(char *darwinversion, osxver *osxversion ) ;
char *osversionString(void) ;
#ifdef TESTING
int main( int argc, char *argv[] )
{
osxver foundver;
char *osverstr= NULL ;
osverstr=osversionString() ;
macosx_ver(osverstr, &foundver ) ;
printf("Mac os x version = 10.%d.%d\n",foundver.minor,foundver.sub );
free(osverstr);
return 0;
}
#endif
char *osversionString(void) {
int mib[2];
size_t len;
char *kernelVersion=NULL;
mib[0] = CTL_KERN;
mib[1] = KERN_OSRELEASE;
if (sysctl(mib, 2, NULL, &len, NULL, 0) < 0 ) {
fprintf(stderr,"%s: Error during sysctl probe call!\n",__PRETTY_FUNCTION__ );
fflush(stdout);
exit(4) ;
}
kernelVersion = malloc(len );
if (kernelVersion == NULL ) {
fprintf(stderr,"%s: Error during malloc!\n",__PRETTY_FUNCTION__ );
fflush(stdout);
exit(4) ;
}
if (sysctl(mib, 2, kernelVersion, &len, NULL, 0) < 0 ) {
fprintf(stderr,"%s: Error during sysctl get verstring call!\n",__PRETTY_FUNCTION__ );
fflush(stdout);
exit(4) ;
}
return kernelVersion ;
}
void macosx_ver(char *darwinversion, osxver *osxversion ) {
/*
From the book Mac Os X and IOS Internals:
In version 10.1.1, Darwin (the core OS) was renumbered from v1.4.1 to 5.1,
and since then has followed the OS X numbers consistently by being four
numbers ahead of the minor version, and aligning its own minor with the
sub-version.
*/
char firstelm[2]= {0,0},secElm[2]={0,0};
if (strlen(darwinversion) < 5 ) {
fprintf(stderr,"%s: %s Can't possibly be a version string. Exiting\n",__PRETTY_FUNCTION__,darwinversion);
fflush(stdout);
exit(2);
}
char *s=darwinversion,*t=firstelm,*curdot=strchr(darwinversion,'.' );
while ( s != curdot )
*t++ = *s++;
t=secElm ;
curdot=strchr(++s,'.' );
while ( s != curdot )
*t++ = *s++;
int maj=0, min=0;
maj= (int)strtol(firstelm, (char **)NULL, 10);
if ( maj == 0 && errno == EINVAL ) {
fprintf(stderr,"%s Error during conversion of version string\n",__PRETTY_FUNCTION__);
fflush(stdout);
exit(4);
}
min=(int)strtol(secElm, (char **)NULL, 10);
if ( min == 0 && errno == EINVAL ) {
fprintf(stderr,"%s: Error during conversion of version string\n",__PRETTY_FUNCTION__);
fflush(stdout);
exit(4);
}
osxversion->minor=maj-4;
osxversion->sub=min;
}
Did you pass the appropriate framework to GCC in order to enable CoreServices
?
% gcc -framework CoreServices -o getos main.c