GETEXECNAME(3C) Standard C Library Functions GETEXECNAME(3C)

NAME


getexecname - return pathname of executable

SYNOPSIS


#include <stdlib.h>

const char *getexecname(void);


DESCRIPTION


The getexecname() function returns the pathname (the first argument of
one of the exec family of functions; see exec(2)) of the executable that
started the process.


Normally this is an absolute pathname, as the majority of commands are
executed by the shells that append the command name to the user's PATH
components. If this is not an absolute path, the output of getcwd(3C)
can be prepended to it to create an absolute path, unless the process or
one of its ancestors has changed its root directory or current working
directory since the last successful call to one of the exec family of
functions.

RETURN VALUES


If successful, getexecname() returns a pointer to the executables
pathname; otherwise, it returns 0.

USAGE


The getexecname() function obtains the executable pathname from the
AT_SUN_EXECNAME aux vector. These vectors are made available to
dynamically linked processes only.


A successful call to one of the exec family of functions will always have
AT_SUN_EXECNAME in the aux vector. The associated pathname is guaranteed
to be less than or equal to PATH_MAX, not counting the trailing null byte
that is always present.

ATTRIBUTES


See attributes(7) for descriptions of the following attributes:


+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|MT-Level | Safe |
+---------------+-----------------+

SEE ALSO


exec(2), getcwd(3C), attributes(7)

illumos December 17, 1997 GETEXECNAME(3C)