Check return value of a few write calls and retry on EINTR, and fix a few other warnings, mostly by printing error messages before giving up.

darcs-hash:20090222202852-ac50b-b0e79142af5b7a99e55271d4001fa252d9684a1d.gz

builtin.c

@@ -2849,7 +2849,7 @@ static int builtin_source( wchar_t ** argv )
 		sb_printf( sb_err,
 			   _( L"%ls: Error while reading file '%ls'\n" ),
 			   argv[0],
-			   fn_intern == L"-" ? L"<stdin>" : fn_intern );
+				   fn_intern == intern_static(L"-") ? L"<stdin>" : fn_intern );
 	}
 	else
 	{

common.c

@@ -578,6 +578,36 @@ int read_blocked(int fd, void *buf, size_t count)
 	return res;	
 }
 
+ssize_t write_loop(int fd, char *buff, size_t count)
+{
+	ssize_t out=0;
+	ssize_t out_cum=0;
+	while( 1 ) 
+	{
+		out = write( fd, 
+					 &buff[out_cum],
+					 count - out_cum );
+		if (out == -1) 
+		{
+			if( errno != EAGAIN &&
+				errno != EINTR ) 
+			{
+				return -1;
+			}
+		} else 
+		{
+			out_cum += out;
+		}
+		if( out_cum >= count ) 
+		{
+			break;
+		}
+	}						
+	return out_cum;
+}
+
+
+
 void debug( int level, const wchar_t *msg, ... )
 {
 	va_list va;
@@ -1815,7 +1845,14 @@ double timef()
 	
 	if( time_res ) 
 	{
-		return nan(0);
+		/*
+		  Fixme: What on earth is the correct parameter value for NaN?
+		  The man pages and the standard helpfully state that this
+		  parameter is implementation defined. Gcc gives a warning if
+		  a null pointer is used. But not even all mighty Google gives
+		  a hint to what value should actually be returned.
+		 */
+		return nan("");
 	}
 	
 	return (double)tv.tv_sec + 0.000001*tv.tv_usec;

common.h

@@ -331,6 +331,12 @@ __sentinel int contains_internal( const wchar_t *needle, ... );
 */
 int read_blocked(int fd, void *buf, size_t count);
 
+/**
+   Loop a write request while failiure is non-critical. Return -1 and set errno
+   in case of critical error.
+ */
+ssize_t write_loop(int fd, char *buff, size_t count);
+
 
 /**
    Issue a debug message with printf-style string formating and

exec.c

@@ -53,6 +53,11 @@
 */
 #define FD_ERROR   _( L"An error occurred while redirecting file descriptor %d" )
 
+/**
+   file descriptor redirection error message
+*/
+#define WRITE_ERROR   _( L"An error occurred while writing output" )
+
 /**
    file redirection error message
 */
@@ -92,6 +97,18 @@ static array_list_t *open_fds=0;
 
 static int set_child_group( job_t *j, process_t *p, int print_errors );
 
+static void exec_write_and_exit( int fd, char *buff, size_t count, int status )
+{
+	if( write_loop(fd, buff, count) == -1 ) 
+	{
+		debug( 0, WRITE_ERROR);
+		wperror( L"write" );
+		exit(status);
+	}
+	exit( status );
+}
+
+
 void exec_close( int fd )
 {
 	int i;
@@ -1426,15 +1443,17 @@ void exec( job_t *j )
 
 					if( pid == 0 )
 					{
+						
 						/*
 						  This is the child process. Write out the contents of the pipeline.
 						*/
 						p->pid = getpid();
 						setup_child_process( j, p );
-						write( io_buffer->fd, 
-							   io_buffer->param2.out_buffer->buff, 
-							   io_buffer->param2.out_buffer->used );
-						exit( status );
+
+						exec_write_and_exit(io_buffer->fd, 
+											io_buffer->param2.out_buffer->buff,
+											io_buffer->param2.out_buffer->used,
+											status);
 					}
 					else
 					{
@@ -1480,10 +1499,10 @@ void exec( job_t *j )
 					p->pid = getpid();
 					setup_child_process( j, p );
 					
-					write( 1,
-						   input_redirect->param2.out_buffer->buff, 
-						   input_redirect->param2.out_buffer->used );
-					exit( 0 );
+					exec_write_and_exit( 1,
+										 input_redirect->param2.out_buffer->buff, 
+										 input_redirect->param2.out_buffer->used,
+										 0);
 				}
 				else
 				{

fish_pager.c

@@ -351,7 +351,7 @@ static int pager_buffered_writer( char c)
 */
 static void pager_flush()
 {
-	write( 1, pager_buffer->buff, pager_buffer->used );
+	write_loop( 1, pager_buffer->buff, pager_buffer->used );
 	pager_buffer->used = 0;
 }
 

fishd.c

@@ -521,7 +521,7 @@ static void load_or_save( int save)
 	if( save )
 	{
 		
-		write( c.fd, SAVE_MSG, strlen(SAVE_MSG) );
+		write_loop( c.fd, SAVE_MSG, strlen(SAVE_MSG) );
 		enqueue_all( &c );
 	}
 	else

mimedb.c

@@ -94,6 +94,17 @@ license. Read the source code of the library for more information.
 */
 #define GETOPT_STRING "tfimdalhv"
 
+/**
+   Error message if system call goes wrong.
+*/
+#define ERROR_SYSTEM "%s: Could not execute command \"%s\"\n" 
+
+/**
+   Exit code if system call goes wrong.
+*/
+#define STATUS_ERROR_SYSTEM 1
+
+
 /**
    All types of input and output possible
 */
@@ -1127,8 +1138,12 @@ static void launch( char *filter, array_list_t *files, int fileno )
 			writer( '&' );
 			writer( '\0' );
 	
-//			fprintf( stderr, "mimedb: %s\n", launch_buff );
-			system( launch_buff );
+			if( system( launch_buff ) == -1 )
+			{
+				fprintf( stderr, _( ERROR_SYSTEM ), MIMEDB, launch_buff );
+				exit(STATUS_ERROR_SYSTEM);
+			}
+			
 			break;
 		}
 	}

output.c

@@ -362,7 +362,7 @@ void set_color( int c, int c2 )
 */
 static int writeb_internal( char c )
 {
-	write( 1, &c, 1 );
+	write_loop( 1, &c, 1 );
 	return 0;
 }
 

parser.c

@@ -436,6 +436,7 @@ typedef struct
 /**
    Return the current number of block nestings
 */
+/*
 static int block_count( block_t *b )
 {
 
@@ -443,7 +444,7 @@ static int block_count( block_t *b )
 		return 0;
 	return( block_count(b->outer)+1);
 }
-
+*/
 
 void parser_push_block( int type )
 {

print_help.c

@@ -5,18 +5,26 @@
 
 #include <stdlib.h>
 #include <stdio.h>
-
+#include <string.h>
 
 #include "print_help.h"
 
 #define CMD_LEN 1024
 
+#define HELP_ERR "Could not show help message\n"
+
 void print_help( char *c, int fd )
 {
 	char cmd[ CMD_LEN];
 	int printed = snprintf( cmd, CMD_LEN, "fish -c '__fish_print_help %s >&%d'", c, fd );
 	
 	if( printed < CMD_LEN )
-		system( cmd );
+	{
+		if( (system( cmd ) == -1) )
+		{
+			write_loop(2, HELP_ERR, strlen(HELP_ERR));
+		}
 		
+	}
+	
 }

proc.c

@@ -356,6 +356,8 @@ static void mark_process_status( job_t *j,
 	}
 	else
 	{
+		ssize_t ignore;
+		
 		/* This should never be reached */
 		p->completed = 1;
 
@@ -364,8 +366,12 @@ static void mark_process_status( job_t *j,
 				  MESS_SIZE,
 				  "Process %d exited abnormally\n",
 				  (int) p->pid );
-		
-		write( 2, mess, strlen(mess) );
+		/*
+		  If write fails, do nothing. We're in a signal handlers error
+		  handler. If things aren't working properly, it's safer to
+		  give up.
+		 */
+		ignore = write( 2, mess, strlen(mess) );
 	}
 }
 

reader.c

@@ -1577,9 +1577,9 @@ static int handle_completions( array_list_t *comp )
 			wchar_t quote;
 			get_param( data->buff, data->buff_pos, &quote, 0, 0, 0 );
 			is_quoted = (quote != L'\0');
-				
-			write(1, "\n", 1 );
-
+			
+			write_loop(1, "\n", 1 );
+			
 			run_pager( prefix, is_quoted, comp );
 		}
 
@@ -2650,7 +2650,7 @@ wchar_t *reader_readline()
 			case R_REPAINT:
 			{
 				exec_prompt();
-				write( 1, "\r", 1 );
+				write_loop( 1, "\r", 1 );
 				s_reset( &data->screen, 0 );
 				reader_repaint();
 				break;

screen.c

@@ -337,7 +337,7 @@ static void s_check_status( screen_t *s)
 		*/
 		
 		int prev_line = s->actual_cursor[1];
-		write( 1, "\r", 1 );
+		write_loop( 1, "\r", 1 );
 		s_reset( s, 0 );
 		s->actual_cursor[1] = prev_line;
 	}
@@ -756,7 +756,7 @@ static void s_update( screen_t *scr, wchar_t *prompt )
 
 	if( output.used )
 	{
-		write( 1, output.buff, output.used );
+		write_loop( 1, output.buff, output.used );
 	}
 	
 	b_destroy( &output );
@@ -804,9 +804,9 @@ void s_write( screen_t *s,
 		char *prompt_narrow = wcs2str( prompt );
 		char *buffer_narrow = wcs2str( b );
 		
-		write( 1, "\r", 1 );
-		write( 1, prompt_narrow, strlen( prompt_narrow ) );
-		write( 1, buffer_narrow, strlen( buffer_narrow ) );
+		write_loop( 1, "\r", 1 );
+		write_loop( 1, prompt_narrow, strlen( prompt_narrow ) );
+		write_loop( 1, buffer_narrow, strlen( buffer_narrow ) );
 
 		free( prompt_narrow );
 		free( buffer_narrow );
@@ -938,7 +938,7 @@ void s_reset( screen_t *s, int reset_cursor )
 		  This should prevent reseting the cursor position during the
 		  next repaint.
 		*/
-		write( 1, "\r", 1 );
+		write_loop( 1, "\r", 1 );
 		s->actual_cursor[1] = prev_line;
 	}
 	fstat( 1, &s->prev_buff_1 );