Linux下confstr與uname函數_獲取C庫與內核信息

#include

#include ?//uname

int main(int argc, char **argv[])

{

struct utsname? u;

if (uname(&u) != -1) {

printf("獲取當前內核的名稱和信息如下\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;

}

輸出如下:‘

獲取當前內核的名稱和信息如下

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函數獲取依賴配置的字符串變量的值

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

#include

#include ? //confstr

int 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;

}

輸出結果如下:

_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

總結

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