31 lines
517 B
C
31 lines
517 B
C
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <errno.h>
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extern char *program_invocation_name;
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extern char *program_invocation_short_name;
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int main() {
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register struct passwd *pw;
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register uid_t uid;
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printf("This is %s speaking.\n", program_invocation_name);
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uid = geteuid();
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pw = getpwuid(uid);
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if (pw)
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{
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printf("Hello, %s!\n", pw->pw_name);
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}
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else
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{
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printf("I don't know your name but your ID is %d!\n", (unsigned) uid);
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}
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return 0;
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}
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