linux下confstr与uname函数_获取C库与内核信息

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#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:Linuxnodename:fesrelease:2.6.32-220.el6.x86_64version:#1 SMP Wed Nov 9 08:03:13 EST 2011machine: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

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