tweak __progname handling some more since some [bad] apps actually try and use it

extra/Configs/Config.in

@@ -460,6 +460,18 @@ config UCLIBC_HAS_PROGRAM_INVOCATION_NAME
 
 	  If unsure, just answer N.
 
+config UCLIBC_HAS___PROGNAME
+	bool "Support for __progname"
+	default y
+	help
+	  Some packages (like openssh) like to peek into internal libc
+	  symbols to make their output a bit more user friendly.
+
+	  At startup, __progname is automatically set up based on the
+	  value of ARGV[0].
+
+	  If unsure, just answer N.
+
 config UNIX98PTY_ONLY
 	bool "Support only Unix 98 PTYs"
 	default y

include/libc-internal.h

@@ -440,6 +440,9 @@ extern int __gettimeofday(struct timeval *__restrict __tv, *__restrict __timezon
 #   define __pthread_mutex_unlock(mutex)                  ((void)0)
 #  endif
 
+/* internal access to program name */
+extern const char *__uclibc_progname attribute_hidden;
+
 # endif /* IS_IN_libc */
 #endif /* __ASSEMBLER__ */
 

libc/misc/assert/__assert.c

@@ -41,10 +41,6 @@
 
 #define ASSERT_SHOW_PROGNAME 1
 
-#ifdef ASSERT_SHOW_PROGNAME
-extern const char *__progname;
-#endif
-
 static int in_assert;			/* bss inits to 0. */
 
 void __assert(const char *assertion, const char * filename,
@@ -55,7 +51,7 @@ void __assert(const char *assertion, const char * filename,
 
 		fprintf(stderr,
 #ifdef ASSERT_SHOW_PROGNAME
-				"%s: %s: %d: %s: Assertion `%s' failed.\n", __progname,
+				"%s: %s: %d: %s: Assertion `%s' failed.\n", __uclibc_progname,
 #else
 				"%s: %d: %s: Assertion `%s' failed.\n",
 #endif

libc/misc/ctype/ctype.c

@@ -156,11 +156,9 @@ int CTYPE_NAME(NAME) (int c) \
 #ifdef L___ctype_assert
 #ifdef __UCLIBC_HAS_CTYPE_ENFORCED__
 
-extern const char *__progname;
-
 void __isctype_assert(int c, int mask)
 {
-	fprintf(stderr,	"%s: __is*{_l}(%d,%#x {locale})\n", __progname, c, mask);
+	fprintf(stderr,	"%s: __is*{_l}(%d,%#x {locale})\n", __uclibc_progname, c, mask);
 	abort();
 }
 

libc/misc/error/err.c

@@ -19,10 +19,8 @@
 #endif
 
 #ifdef __UCLIBC_MJN3_ONLY__
-#warning REMINDER: Need a centralized __progname prototype.
 #warning REMINDER: Deal with wide oriented stderr case.
 #endif
-extern const char *__progname;
 
 static void vwarn_work(const char *format, va_list args, int showerr)
 {
@@ -41,7 +39,7 @@ static void vwarn_work(const char *format, va_list args, int showerr)
 
 	__STDIO_AUTO_THREADLOCK(stderr);
 
-	fprintf(stderr, fmt, __progname);
+	fprintf(stderr, fmt, __uclibc_progname);
 	if (format) {
 		vfprintf(stderr, format, args);
 		f -= 2;					/* At 5 (showerr) or 9. */

libc/misc/internals/__uClibc_main.c

@@ -63,13 +63,15 @@ extern void weak_function _locale_init(void) attribute_hidden;
 #ifdef __UCLIBC_HAS_THREADS__
 extern void weak_function __pthread_initialize_minimal(void);
 #endif
+
+attribute_hidden const char *__uclibc_progname = NULL;
+#ifdef __UCLIBC_HAS___PROGNAME__
+strong_alias (__uclibc_progname, __progname)
+#endif
 #ifdef __UCLIBC_HAS_PROGRAM_INVOCATION_NAME__
-char *program_invocation_name = (char *) "";
-char *program_invocation_short_name = (char *) "";
-hidden_strong_alias (program_invocation_name, __progname_full)
-hidden_strong_alias (program_invocation_short_name, __progname)
-#else
-attribute_hidden const char *__progname = NULL;
+attribute_hidden const char *__progname_full = NULL;
+strong_alias (__uclibc_progname, program_invocation_short_name)
+strong_alias (__progname_full, program_invocation_name)
 #endif
 
 /*
@@ -261,16 +263,14 @@ __uClibc_main(int (*main)(int, char **, char **), int argc,
 #endif
 
 #ifdef __UCLIBC_HAS_PROGRAM_INVOCATION_NAME__
-    if (likely(argv && argv[0])) {
-	__progname_full = *argv;
-	__progname = __strrchr(*argv, '/');
-	if (__progname != NULL)
-		++__progname;
-	else
-		__progname = __progname_full;
-    }
+    __progname_full = *argv;
+    __progname = __strrchr(*argv, '/');
+    if (__progname != NULL)
+	++__progname;
+    else
+	__progname = __progname_full;
 #else
-    __progname = *argv;
+    __uclibc_progname = *argv;
 #endif
 
 #ifdef __UCLIBC_CTOR_DTOR__

libc/sysdeps/linux/common/ssp.c

@@ -77,12 +77,11 @@ static __always_inline attribute_noreturn void terminate(void)
 void attribute_noreturn __stack_smash_handler(char func[], int damaged __attribute__ ((unused)));
 void attribute_noreturn __stack_smash_handler(char func[], int damaged)
 {
-	extern char *__progname;
 	static const char message[] = ": stack smashing attack in function ";
 
 	block_signals();
 
-	ssp_write(STDERR_FILENO, __progname, message, func);
+	ssp_write(STDERR_FILENO, __uclibc_progname, message, func);
 
 	/* The loop is added only to keep gcc happy. */
 	while(1)
@@ -91,13 +90,12 @@ void attribute_noreturn __stack_smash_handler(char func[], int damaged)
 
 void attribute_noreturn __stack_chk_fail(void)
 {
-	extern char *__progname;
 	static const char msg1[] = "stack smashing detected: ";
 	static const char msg3[] = " terminated";
 
 	block_signals();
 
-	ssp_write(STDERR_FILENO, msg1, __progname, msg3);
+	ssp_write(STDERR_FILENO, msg1, __uclibc_progname, msg3);
 
 	/* The loop is added only to keep gcc happy. */
 	while(1)
@@ -107,13 +105,12 @@ void attribute_noreturn __stack_chk_fail(void)
 #if 0
 void attribute_noreturn __chk_fail(void)
 {
-	extern char *__progname;
 	static const char msg1[] = "buffer overflow detected: ";
 	static const char msg3[] = " terminated";
 
 	block_signals();
 
-	ssp_write(STDERR_FILENO, msg1, __progname, msg3);
+	ssp_write(STDERR_FILENO, msg1, __uclibc_progname, msg3);
 
 	/* The loop is added only to keep gcc happy. */
 	while(1)