GNU/Linux man pages
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GNU/Linux |
RedHat 6.2(Zoot) |
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sethostname(2) |
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gethostname, sethostname − get/set host name
#include <unistd.h>
int
gethostname(char *name, size_t
len);
int sethostname(const char *name, size_t
len);
These functions are used to access or to change the host name of the current processor.
On success, zero is returned. On error, −1 is returned, and errno is set appropriately.
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EINVAL |
len is negative or, for sethostname, len is larger than the maximum allowed size, or, for gethostname on Linux/i386, len is smaller than the actual size. | ||
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EPERM |
For sethostname, the caller was not the superuser. | ||
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EFAULT |
name is an invalid address. |
SVr4, 4.4BSD (this function first appeared in 4.2BSD). POSIX.1 does not define these functions, but ISO/IEC 9945-1:1990 mentions them in B.4.4.1.
Some other implementations of gethostname successfully return len bytes even if name is longer. Linux/Alpha complies with this behaviour. Linux/i386, however, returns EINVAL in this case (as of DLL 4.6.27 libraries).
Under Linux/Alpha, gethostname is a system call. Under Linux/i386, gethostname is implemented at the library level by calling uname(2).
getdomainname(2), setdomainname(2), uname(2)
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sethostname(2) | |