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/* * getdomainname.c */ #include <errno.h> #include <unistd.h> #include <string.h> #include <sys/utsname.h> int getdomainname(char *name, size_t len) { struct utsname un; if (uname(&un)) return -1; if (len < strlen(un.domainname) + 1) { errno = EINVAL; return -1; } strcpy(name, un.domainname); return 0; }