74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
#define _POSIX_C_SOURCE 200809L
|
|
|
|
#include <stdio.h>
|
|
#include <sys/utsname.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
int main(int argc, char * argv[]) {
|
|
/* The utsname struct has to be preallocated for uname() to work. */
|
|
struct utsname * sys_name = malloc(sizeof(*sys_name));
|
|
if(sys_name == NULL) {
|
|
fprintf(stderr, "%s: insufficient memory\n", argv[0]);
|
|
return 2;
|
|
}
|
|
int stuff_printed = 0;
|
|
char c;
|
|
/*
|
|
This variable holds what all we need to print, corresponding
|
|
to the following options:
|
|
01: -m (Machine type)
|
|
02: -n (Hostname)
|
|
04: -r (Release)
|
|
010: -s (Operating system)
|
|
020: -v (Version)
|
|
037: -a (Everything)
|
|
*/
|
|
int stuff_print = 0;
|
|
|
|
/* Get options */
|
|
while((c = getopt(argc, argv, "amnrsv")) != -1) {
|
|
switch(c) {
|
|
case 'm': stuff_print |= 01; break;
|
|
case 'n': stuff_print |= 02; break;
|
|
case 'r': stuff_print |= 04; break;
|
|
case 's': stuff_print |= 010; break;
|
|
case 'v': stuff_print |= 020; break;
|
|
case 'a': stuff_print |= 037; break;
|
|
}
|
|
/* If we saw -a, then just leave, we're done here. */
|
|
if(c == 'a') { break; }
|
|
}
|
|
|
|
/* If no options specified, print OS name */
|
|
if(stuff_print == 0) {
|
|
stuff_print = 010;
|
|
}
|
|
|
|
int got_uname = 0;
|
|
got_uname = uname(sys_name); /* Try to get the utsname struct */
|
|
if(got_uname == -1) {
|
|
fprintf(stderr, "%s: could not get uname\n", argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
/* Print everything and trailing newline */
|
|
if(stuff_print & 010) {
|
|
printf("%s ", sys_name->sysname);
|
|
}
|
|
if(stuff_print & 02) {
|
|
printf("%s ", sys_name->nodename);
|
|
}
|
|
if(stuff_print & 04) {
|
|
printf("%s ", sys_name->release);
|
|
}
|
|
if(stuff_print & 020) {
|
|
printf("%s ", sys_name->version);
|
|
}
|
|
if(stuff_print & 01) {
|
|
printf("%s", sys_name->machine);
|
|
}
|
|
|
|
printf("\n");
|
|
return 0;
|
|
} |