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#define _POSIX_C_SOURCE 2
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <sys/utsname.h>
enum name
{
NAME_SYSNAME = 1 << 0,
NAME_NODENAME = 1 << 1,
NAME_RELEASE = 1 << 2,
NAME_VERSION = 1 << 3,
NAME_MACHINE = 1 << 4,
NAME_ALL = NAME_SYSNAME | NAME_NODENAME | NAME_RELEASE | NAME_VERSION | NAME_MACHINE,
};
static void print_name(char *name)
{
static bool previous = false;
if (previous)
fputc(' ' ,stdout);
else
previous = true;
fputs(name, stdout);
}
int main(int argc, char *argv[])
{
enum name names = 0;
int option;
while ((option = getopt(argc, argv, "amnrsv")) != -1)
{
switch (option)
{
case 'a': names |= NAME_ALL; break;
case 'm': names |= NAME_MACHINE; break;
case 'n': names |= NAME_NODENAME; break;
case 'r': names |= NAME_RELEASE; break;
case 's': names |= NAME_SYSNAME; break;
case 'v': names |= NAME_VERSION; break;
}
}
if (optind != argc)
{
fprintf(stderr, "%s: extra operand '%s'\n", argv[0], argv[optind]);
exit(1);
}
if (names == 0)
names = NAME_SYSNAME;
struct utsname names_buf;
uname(&names_buf);
if (names & NAME_SYSNAME)
print_name(names_buf.sysname);
if (names & NAME_NODENAME)
print_name(names_buf.nodename);
if (names & NAME_RELEASE)
print_name(names_buf.release);
if (names & NAME_VERSION)
print_name(names_buf.version);
if (names & NAME_MACHINE)
print_name(names_buf.machine);
fputc('\n', stdout);
return 0;
}
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