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NAME="NET-COMMON-TCPIP-MANPAGES-GETHOSTNAME">gethostname</H1
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NAME="NET-COMMON-TCPIP-MANPAGES-GETHOSTNAME">gethostname</H1
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>GETHOSTNAME(3) System Library Functions Manual GETHOSTNAME(3)
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>GETHOSTNAME(3) System Library Functions Manual GETHOSTNAME(3)
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NAME
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NAME
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gethostname, sethostname - get/set name of current host
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gethostname, sethostname - get/set name of current host
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SYNOPSIS
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SYNOPSIS
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#include <unistd.h>
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#include <unistd.h>
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int
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int
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gethostname(char *name, size_t namelen);
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gethostname(char *name, size_t namelen);
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int
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int
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sethostname(const char *name, size_t namelen);
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sethostname(const char *name, size_t namelen);
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DESCRIPTION
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DESCRIPTION
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The gethostname() function returns the standard host name for the current
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The gethostname() function returns the standard host name for the current
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processor, as previously set by sethostname(). The parameter namelen
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processor, as previously set by sethostname(). The parameter namelen
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specifies the size of the name array. If insufficient space is provided,
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specifies the size of the name array. If insufficient space is provided,
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the returned name is truncated. The returned name is always null termi-
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the returned name is truncated. The returned name is always null termi-
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nated.
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nated.
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sethostname() sets the name of the host machine to be name, which has
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sethostname() sets the name of the host machine to be name, which has
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length namelen. This call is restricted to the superuser and is normally
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length namelen. This call is restricted to the superuser and is normally
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used only when the system is bootstrapped.
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used only when the system is bootstrapped.
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RETURN VALUES
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RETURN VALUES
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If the call succeeds a value of 0 is returned. If the call fails, a
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If the call succeeds a value of 0 is returned. If the call fails, a
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value of -1 is returned and an error code is placed in the global vari-
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value of -1 is returned and an error code is placed in the global vari-
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able errno.
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able errno.
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ERRORS
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ERRORS
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The following errors may be returned by these calls:
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The following errors may be returned by these calls:
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[EFAULT] The name or namelen parameter gave an invalid address.
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[EFAULT] The name or namelen parameter gave an invalid address.
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[EPERM] The caller tried to set the hostname and was not the
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[EPERM] The caller tried to set the hostname and was not the
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superuser.
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superuser.
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SEE ALSO
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SEE ALSO
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hostname(1), getdomainname(3), gethostid(3), sysctl(3), sysctl(8), yp(8)
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hostname(1), getdomainname(3), gethostid(3), sysctl(3), sysctl(8), yp(8)
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STANDARDS
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STANDARDS
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The gethostname() function call conforms to X/Open Portability Guide
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The gethostname() function call conforms to X/Open Portability Guide
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Issue 4.2 (``XPG4.2'').
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Issue 4.2 (``XPG4.2'').
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HISTORY
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HISTORY
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The gethostname() function call appeared in 4.2BSD.
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The gethostname() function call appeared in 4.2BSD.
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BUGS
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BUGS
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Host names are limited to MAXHOSTNAMELEN (from <sys/param.h>) characters,
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Host names are limited to MAXHOSTNAMELEN (from <sys/param.h>) characters,
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currently 256. This includes the terminating NUL character.
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currently 256. This includes the terminating NUL character.
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If the buffer passed to gethostname() is smaller than MAXHOSTNAMELEN,
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If the buffer passed to gethostname() is smaller than MAXHOSTNAMELEN,
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other operating systems may not guarantee termination with NUL.
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other operating systems may not guarantee termination with NUL.
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BSD June 4, 1993 BSD
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BSD June 4, 1993 BSD
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</PRE
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