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) December 17, 1997 GETEXECNAME(3C)
