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#define _XOPEN_SOURCE
#include <stdio.h>
#include <sys/utsname.h>
#include <unistd.h>
int
main(int argc, char **argv) {
int c;
int OPT_m, OPT_n, OPT_r, OPT_s, OPT_v;
OPT_m = OPT_n = OPT_r = OPT_s = OPT_v = 0;
if (argc == 1)
OPT_s = 1;
while ((c = getopt(argc, argv, ":amnrsv")) != -1) {
switch (c) {
case 'a':
OPT_m = OPT_n = OPT_r = OPT_s = OPT_v = 1;
break;
case 'm':
OPT_m = 1;
break;
case 'n':
OPT_n = 1;
break;
case 'r':
OPT_r = 1;
break;
case 's':
OPT_s = 1;
break;
case 'v':
OPT_v = 1;
break;
case '?':
fprintf(stderr, "usage: %s [-amnrsv]\n", *argv);
return 1;
}
}
struct utsname ut;
if (uname(&ut) == -1) {
perror("uname");
return 1;
}
/* TODO: don't print unnecessary trailing spaces */
if (OPT_s) printf("%s ", ut.sysname);
if (OPT_n) printf("%s ", ut.nodename);
if (OPT_r) printf("%s ", ut.release);
if (OPT_v) printf("%s ", ut.version);
if (OPT_m) printf("%s ", ut.machine);
printf("\n");
return 0;
}
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