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Improve error messages on failed execve calls a bit more

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darcs-hash:20080116010454-75c98-883050bf00f10bdb205724d7d273f10e6f0a1065.gz
This commit is contained in:
liljencrantz 2008-01-16 11:04:54 +10:00
parent f3b6b74568
commit f974c7c416
1 changed files with 73 additions and 7 deletions
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80
exec.c
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@ -442,7 +442,41 @@ static int setup_child_process( job_t *j, process_t *p )
return res;
}
/**
Returns the interpreter for the specified script. Returns 0 if file
is not a script with a shebang. This function leaks memory on every
call. Only use it in the execve error handler which calls exit
right afterwards, anyway.
*/
static wchar_t *get_interpreter( wchar_t *file )
{
string_buffer_t sb;
FILE *fp = wfopen( file, "r" );
sb_init( &sb );
wchar_t *res = 0;
if( fp )
{
while( 1 )
{
wint_t ch = getwc( fp );
if( ch == WEOF )
break;
if( ch == L'\n' )
break;
sb_append_char( &sb, (wchar_t)ch );
}
}
res = (wchar_t *)sb.buff;
if( !wcsncmp( L"#! /", res, 4 ) )
return res+3;
if( !wcsncmp( L"#!/", res, 3 ) )
return res+2;
return 0;
}
/**
This function is executed by the child process created by a call to
@ -503,7 +537,7 @@ static void launch_process( process_t *p )
p->argv = res;
p->actual_cmd = L"/bin/sh";
res_real = wcsv2strv( (const wchar_t **) res);
res_real = wcsv2strv( (const wchar_t **) res);
execve ( wcs2str(p->actual_cmd),
res_real,
@ -552,19 +586,19 @@ static void launch_process( process_t *p )
sb_format_size( &sz2, ARG_MAX );
debug( 0,
L"The total size of the argument and environment lists (%ls) exceeds the system limit of %ls.",
L"The total size of the argument and environment lists (%ls) exceeds the operating system limit of %ls.",
(wchar_t *)sz1.buff,
(wchar_t *)sz2.buff);
}
else
{
debug( 0,
L"The total size of the argument and environment lists (%ls) exceeds the system limit.",
L"The total size of the argument and environment lists (%ls) exceeds the operating system limit.",
(wchar_t *)sz1.buff);
}
debug( 0,
L"Please try running the command again with fewer arguments.");
L"Try running the command again with fewer arguments.");
sb_destroy( &sz1 );
sb_destroy( &sz2 );
@ -573,10 +607,42 @@ static void launch_process( process_t *p )
break;
}
case ENOEXEC:
{
wperror(L"exec");
debug(0, L"The file '%ls' is marked as an executable but could not be run by the operating system.", p->actual_cmd);
exit(STATUS_EXEC_FAIL);
}
case ENOENT:
{
wchar_t *interpreter = get_interpreter( p->actual_cmd );
if( interpreter && waccess( interpreter, X_OK ) )
{
debug(0, L"The file '%ls' specified the interpreter '%ls', which is not an executable command.", p->actual_cmd, interpreter );
}
else
{
debug(0, L"The file '%ls' or a script or ELF interpreter does not exist, or a shared library needed for file or interpreter cannot be found.", p->actual_cmd);
}
exit(STATUS_EXEC_FAIL);
}
case ENOMEM:
{
debug(0, L"Out of memory");
exit(STATUS_EXEC_FAIL);
}
default:
{
debug(0, L"The file '%ls' is marked as an executable but could not be run by the operating system.", p->actual_cmd);
exit(STATUS_EXEC_FAIL);
wperror(L"exec");
// debug(0, L"The file '%ls' is marked as an executable but could not be run by the operating system.", p->actual_cmd);
exit(STATUS_EXEC_FAIL);
}
}