getdomainname(2) System Calls Manual getdomainname(2) NAME getdomainname, setdomainname - get/set NIS domain name LIBRARY Standard C library (libc, -lc) SYNOPSIS #include <unistd.h> int getdomainname(char *name, size_t len); int setdomainname(const char *name, size_t len); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): getdomainname(), setdomainname(): Since glibc 2.21: _DEFAULT_SOURCE In glibc 2.19 and 2.20: _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500) Up to and including glibc 2.19: _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500) DESCRIPTION These functions are used to access or to change the NIS domain name of the host system. More precisely, they operate on the NIS domain name associated with the calling process's UTS namespace. setdomainname() sets the domain name to the value given in the charac- ter array name. The len argument specifies the number of bytes in name. (Thus, name does not require a terminating null byte.) getdomainname() returns the null-terminated domain name in the charac- ter array name, which has a length of len bytes. If the null-termi- nated domain name requires more than len bytes, getdomainname() returns the first len bytes (glibc) or gives an error (libc). RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set to indicate the error. ERRORS setdomainname() can fail with the following errors: EFAULT name pointed outside of user address space. EINVAL len was negative or too large. EPERM The caller did not have the CAP_SYS_ADMIN capability in the user namespace associated with its UTS namespace (see namespaces(7)). getdomainname() can fail with the following errors: EINVAL For getdomainname() under libc: name is NULL or name is longer than len bytes. STANDARDS POSIX does not specify these calls. NOTES Since Linux 1.0, the limit on the length of a domain name, including the terminating null byte, is 64 bytes. In older kernels, it was 8 bytes. On most Linux architectures (including x86), there is no getdomain- name() system call; instead, glibc implements getdomainname() as a li- brary function that returns a copy of the domainname field returned from a call to uname(2). SEE ALSO gethostname(2), sethostname(2), uname(2), uts_namespaces(7) Linux man-pages 6.03 2022-10-30 getdomainname(2)
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