]>
Commit | Line | Data |
---|---|---|
4c8608f0 MT |
1 | |
2 | ||
3 | #include <stdio.h> | |
4 | #include <string.h> | |
5 | #include <dlfcn.h> | |
6 | #include <stdlib.h> /* for EXIT_FAILURE */ | |
7 | #include <unistd.h> /* for _exit() */ | |
8 | #include <sys/types.h> | |
9 | #include <sys/stat.h> | |
10 | #include <fcntl.h> | |
11 | #include <sys/syslog.h> | |
12 | #include <sys/utsname.h> | |
13 | ||
14 | #ifndef RTLD_NEXT | |
15 | #define RTLD_NEXT ((void *) -1l) | |
16 | #endif | |
17 | ||
18 | typedef int (*uname_t)(struct utsname * buf); | |
19 | ||
20 | static void *get_libc_func(const char *funcname) { | |
21 | char *error; | |
22 | ||
23 | void *func = dlsym(RTLD_NEXT, funcname); | |
24 | if ((error = dlerror()) != NULL) { | |
25 | fprintf(stderr, "I can't locate libc function `%s' error: %s", funcname, error); | |
26 | _exit(EXIT_FAILURE); | |
27 | } | |
28 | ||
29 | return func; | |
30 | } | |
31 | ||
32 | int uname(struct utsname *buf) { | |
33 | char *env = NULL; | |
34 | ||
35 | /* Call real uname to get the information we need. */ | |
36 | uname_t real_uname = (uname_t)get_libc_func("uname"); | |
37 | int ret = real_uname((struct utsname *) buf); | |
38 | ||
39 | /* Replace release if requested. */ | |
40 | if ((env = getenv("UTS_RELEASE")) != NULL) { | |
41 | strncpy(buf->release, env, _UTSNAME_RELEASE_LENGTH); | |
42 | } | |
43 | ||
44 | /* Replace machine type if requested. */ | |
45 | if ((env = getenv("UTS_MACHINE")) != NULL) { | |
46 | strncpy(buf->machine, env, _UTSNAME_MACHINE_LENGTH); | |
47 | } | |
48 | ||
49 | return ret; | |
50 | } |