/* Program name management.
- Copyright (C) 2001-2003, 2005-2009 Free Software Foundation, Inc.
- Written by Bruno Haible <haible@clisp.cons.org>, 2001.
+ Copyright (C) 2001-2003, 2005-2011 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2001.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#undef ENABLE_RELOCATABLE /* avoid defining set_program_name as a macro */
#include "progname.h"
+#include <errno.h> /* get program_invocation_name declaration */
+#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
To be initialized by main(). */
const char *program_name = NULL;
-/* Set program_name, based on argv[0]. */
+/* Set program_name, based on argv[0].
+ argv0 must be a string allocated with indefinite extent, and must not be
+ modified after this call. */
void
set_program_name (const char *argv0)
{
const char *slash;
const char *base;
+ /* Sanity check. POSIX requires the invoking process to pass a non-NULL
+ argv[0]. */
+ if (argv0 == NULL)
+ {
+ /* It's a bug in the invoking program. Help diagnosing it. */
+ fputs ("A NULL argv[0] was passed through an exec system call.\n",
+ stderr);
+ abort ();
+ }
+
slash = strrchr (argv0, '/');
base = (slash != NULL ? slash + 1 : argv0);
if (base - argv0 >= 7 && strncmp (base - 7, "/.libs/", 7) == 0)
{
argv0 = base;
if (strncmp (base, "lt-", 3) == 0)
- argv0 = base + 3;
+ {
+ argv0 = base + 3;
+ /* On glibc systems, remove the "lt-" prefix from the variable
+ program_invocation_short_name. */
+#if HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME
+ program_invocation_short_name = (char *) argv0;
+#endif
+ }
}
/* But don't strip off a leading <dirname>/ in general, because when the user
*/
program_name = argv0;
+
+ /* On glibc systems, the error() function comes from libc and uses the
+ variable program_invocation_name, not program_name. So set this variable
+ as well. */
+#if HAVE_DECL_PROGRAM_INVOCATION_NAME
+ program_invocation_name = (char *) argv0;
+#endif
}