Implement optional syslog logging using ordinary

bb_xx_msg calls, and convert networking/* to it.
The rest of bbox will be converted gradually.

libbb/Makefile.in

@@ -28,6 +28,7 @@ LIBBB-y:= \
 	restricted_shell.c run_parts.c run_shell.c safe_read.c safe_write.c \
 	safe_strncpy.c setup_environment.c sha1.c simplify_path.c \
 	trim.c u_signal_names.c vdprintf.c verror_msg.c \
+	info_msg.c vinfo_msg.c \
 	vherror_msg.c vperror_msg.c wfopen.c xconnect.c xgetcwd.c xstat.c \
 	xgethostbyname.c xgethostbyname2.c xreadlink.c xgetlarg.c \
 	get_terminal_width_height.c fclose_nonstdin.c fflush_stdout_and_exit.c \

libbb/dump.c

@@ -220,7 +220,7 @@ static void rewrite(FS * fs)
 				}
 			} else {
 			DO_BAD_CONV_CHAR:
-				bb_error_msg_and_die("bad conversion character %%%s.\n", p1);
+				bb_error_msg_and_die("bad conversion character %%%s.", p1);
 			}
 
 			/*
@@ -253,7 +253,7 @@ static void rewrite(FS * fs)
 
 			/* only one conversion character if byte count */
 			if (!(pr->flags & F_ADDRESS) && fu->bcnt && nconv++) {
-				bb_error_msg_and_die("byte count with multiple conversion characters.\n");
+				bb_error_msg_and_die("byte count with multiple conversion characters.");
 			}
 		}
 		/*

libbb/error_msg.c

@@ -18,7 +18,6 @@ void bb_error_msg(const char *s, ...)
 	va_list p;
 
 	va_start(p, s);
-	bb_verror_msg(s, p);
+	bb_verror_msg(s, p, NULL);
 	va_end(p);
-	putc('\n', stderr);
 }

libbb/error_msg_and_die.c

@@ -18,8 +18,7 @@ void bb_error_msg_and_die(const char *s, ...)
 	va_list p;
 
 	va_start(p, s);
-	bb_verror_msg(s, p);
+	bb_verror_msg(s, p, NULL);
 	va_end(p);
-	putc('\n', stderr);
 	exit(bb_default_error_retval);
 }

libbb/inet_common.c

@@ -205,7 +205,7 @@ int INET6_rresolve(char *name, size_t len, struct sockaddr_in6 *sin6,
 	/* Grmpf. -FvK */
 	if (sin6->sin6_family != AF_INET6) {
 #ifdef DEBUG
-		bb_error_msg(_("rresolve: unsupport address family %d !\n"),
+		bb_error_msg(_("rresolve: unsupport address family %d!"),
 				  sin6->sin6_family);
 #endif
 		errno = EAFNOSUPPORT;

libbb/setup_environment.c

@@ -60,10 +60,7 @@ void setup_environment ( const char *shell, int loginshell, int changeenv, const
 		 * Some systems default to HOME=/
 		 */
 		if ( chdir ( pw-> pw_dir )) {
-			if ( chdir ( "/" )) {
-				syslog ( LOG_WARNING, "unable to cd to %s' for user %s'\n", pw-> pw_dir, pw-> pw_name );
-				bb_error_msg_and_die ( "cannot cd to home directory or /" );
-			}
+			xchdir ( "/" );
 			fputs ( "warning: cannot change to home directory\n", stderr );
 		}
 

libbb/verror_msg.c

@@ -11,11 +11,37 @@
 #include <errno.h>
 #include <string.h>
 #include <stdlib.h>
+#include <syslog.h>
 #include "libbb.h"
 
-void bb_verror_msg(const char *s, va_list p)
+int logmode = LOGMODE_STDIO;
+
+void bb_verror_msg(const char *s, va_list p, const char* strerr)
 {
-	fflush(stdout);
-	fprintf(stderr, "%s: ", bb_applet_name);
-	vfprintf(stderr, s, p);
+	/* va_copy is used because it is not portable
+	 * to use va_list p twice */
+	va_list p2;
+	va_copy(p2, p);
+
+	if (logmode & LOGMODE_STDIO) {
+		fflush(stdout);
+		fprintf(stderr, "%s: ", bb_applet_name);
+		vfprintf(stderr, s, p);
+		if (!strerr)
+			fputc('\n', stderr);
+		else
+			fprintf(stderr, ": %s\n", strerr);
+	}
+	if (logmode & LOGMODE_SYSLOG) {
+		if (!strerr)
+			vsyslog(LOG_ERR, s, p2);
+		else  {
+			char *msg;
+			if (vasprintf(&msg, s, p2) < 0)
+				bb_error_msg_and_die(bb_msg_memory_exhausted);
+			syslog(LOG_ERR, "%s: %s", msg, strerr);
+			free(msg);
+		}
+	}
+	va_end(p2);
 }

libbb/vherror_msg.c

@@ -16,10 +16,5 @@
 
 void bb_vherror_msg(const char *s, va_list p)
 {
-	if(s == 0)
-		s = "";
-	bb_verror_msg(s, p);
-	if (*s)
-		fputs(": ", stderr);
-	herror("");
+	bb_verror_msg(s, p, hstrerror(h_errno));
 }

libbb/vperror_msg.c

@@ -15,9 +15,5 @@
 
 void bb_vperror_msg(const char *s, va_list p)
 {
-	int err=errno;
-	if(s == 0) s = "";
-	bb_verror_msg(s, p);
-	if (*s) s = ": ";
-	fprintf(stderr, "%s%s\n", s, strerror(err));
+	bb_verror_msg(s, p, strerror(errno));
 }

libbb/xfuncs.c

@@ -397,7 +397,7 @@ char *xasprintf(const char *format, ...)
 	va_end(p);
 #endif
 
-	if (r < 0) bb_perror_msg_and_die("xasprintf");
+	if (r < 0) bb_error_msg_and_die(bb_msg_memory_exhausted);
 	return string_ptr;
 }
 #endif