#include <stdio.h>
#include <sys/utsname.h>	//unameint main(int argc, char **argv[])
{struct utsname  u;if (uname(&u) != -1) {printf("获取当前内核的名称和信息如下\n""sysname:%s\n""nodename:%s\n""release:%s\n""version:%s\n""machine:%s\n", u.sysname, u.nodename, u.release, u.version, u.machine);}return 0;
}

输出如下:

获取当前内核的名称和信息如下
sysname:Linux
nodename:fes
release:2.6.32-220.el6.x86_64
version:#1 SMP Wed Nov 9 08:03:13 EST 2011
machine:x86_64

size_t confstr(int name, char *buf, size_t len);
confstr函数获取依赖配置的字符串变量的值
1、_CS_GNU_LIBC_VERSION，the GNU C library version on this system
2、_CS_GNU_LIBPTHREAD_VERSION，the POSIX implementation supplied by this C library
3、_CS_PATH,A value for the PATH variable which indicates where all the POSIX.2 standard utilities can be found.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>		//confstrint main(int argc, char **argv[])
{char *pathbuf, *gun_libpthread_version_buf, *gun_libc_version_buf;size_t n;n = confstr(_CS_PATH,NULL,(size_t) 0);pathbuf = malloc(n);if (pathbuf == NULL)abort();confstr(_CS_PATH, pathbuf, n);printf("_CS_PATH, A value for the PATH variable:%s\n", pathbuf);free(pathbuf);pathbuf = NULL;n = confstr(_CS_GNU_LIBPTHREAD_VERSION,NULL,(size_t) 0);if (n > 0) {gun_libpthread_version_buf = malloc(n);}if (gun_libpthread_version_buf == NULL)abort();confstr(_CS_GNU_LIBPTHREAD_VERSION, gun_libpthread_version_buf, n);printf("_CS_GNU_LIBPTHREAD_VERSION, the POSIX implementation supplied by this C library:%s\n", gun_libpthread_version_buf);free(gun_libpthread_version_buf);gun_libpthread_version_buf = NULL;n = confstr(_CS_GNU_LIBC_VERSION,NULL,(size_t) 0);if (n > 0) {gun_libc_version_buf = malloc(n);}if (gun_libc_version_buf == NULL)abort();confstr(_CS_GNU_LIBC_VERSION, gun_libc_version_buf, n);printf("_CS_GNU_LIBC_VERSION, the GNU C library version on this system: %s\n" \, gun_libc_version_buf);free(gun_libc_version_buf);gun_libc_version_buf = NULL;return 0;
}

输出结果如下:

_CS_PATH, A value for the PATH variable:/bin:/usr/bin
_CS_GNU_LIBPTHREAD_VERSION, the POSIX implementation supplied by this C library:NPTL 2.12
_CS_GNU_LIBC_VERSION, the GNU C library version on this system: glibc 2.12