The path name of the executing process as required by dld_init
might not be easily obtained all the time. Not all systems pass the
entire path name of the executable file as the first argument
(argv[0]) to main. In order to obtain the full path of
the executable file, dld_init uses the dld_find_program
function.
dld_find_progname returns the absolute path name of the file
that would be executed if command were given as a command. It
looks up the environment variable PATH, searches in each of the
directory listed for progname, and returns the absolute path name
for the first occurrence.
Note: If the current process is executed using the
execve call without passing the correct path name as argument 0,
dld_find_program (argv[0]) will also fail to locate the
executable file.
dld_find_executable returns zero if command is not found
in any of the directories listed in PATH.
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