30 lines
773 B
C
30 lines
773 B
C
#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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int getlogin_r(char *buf, size_t bufsize) {
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strncpy(buf, getenv("USER"), bufsize);
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return 0;
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}
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struct passwd *getpwuid(uid_t uid) {
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struct passwd *(*getpwuid)(uid_t) = dlsym(RTLD_NEXT, "getpwuid");
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if (getpwuid == NULL) {
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fprintf(stderr, "Unable to find the adress of the getpwuid function: %s\n", dlerror());
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return NULL;
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}
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struct passwd *pass = getpwuid(uid);
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char *name = getenv("USER");
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if (name == NULL) {
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fprintf(stderr, "Could not find the USER environment variable. Using the real username.\n");
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return pass;
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}
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pass->pw_name = name;
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return pass;
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}
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