getexecname man page on SmartOS

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       getexecname - return pathname of executable

       #include <stdlib.h>

       const char *getexecname(void);

       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 work‐
       ing directory since the last successful call to one of the exec	family
       of functions.

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

       The getexecname() function obtains the  executable  pathname  from  the
       AT_SUN_EXECNAME aux vector.  These vectors are made available to dynam‐
       ically 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.

       See attributes(5) for descriptions of the following attributes:

       │MT-Level       │ Safe		 │

       exec(2), getcwd(3C), attributes(5)

				 Dec 17, 1997		       GETEXECNAME(3C)

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