Linux下confstr与uname函数_获取C库与内核信息

Linux下confstr与uname函数_获取C库与内核信息#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 "
"sysname:%s "
"nodename:%s "
"release:%s "
"version:%s "
"machine:%s "
, 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_64size_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 ", 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 ", 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 "
, 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本文永久更新链接地址：http://www.linuxidc.com/Linux/2014-10/108581.htm