-/* Copyright (C) 2002, 2003, 2005, 2006, 2007, 2009, 2010
+/* Copyright (C) 2002, 2003, 2005, 2006, 2007, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Andy Vaught
#include <assert.h>
#include <string.h>
#include <errno.h>
-
-#ifdef HAVE_SIGNAL_H
#include <signal.h>
-#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
-#ifdef HAVE_STDLIB_H
#include <stdlib.h>
-#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
-/* sys_exit()-- Terminate the program with an exit code. */
+/* Termination of a program: F2008 2.3.5 talks about "normal
+ termination" and "error termination". Normal termination occurs as
+ a result of e.g. executing the end program statement, and executing
+ the STOP statement. It includes the effect of the C exit()
+ function.
-void
-sys_exit (int code)
-{
- /* Show error backtrace if possible. */
- if (code != 0 && code != 4
- && (options.backtrace == 1
- || (options.backtrace == -1 && compile_options.backtrace == 1)))
- show_backtrace ();
-
- /* Dump core if requested. */
- if (code != 0
- && (options.dump_core == 1
- || (options.dump_core == -1 && compile_options.dump_core == 1)))
- {
-#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_CORE)
- /* Warn if a core file cannot be produced because
- of core size limit. */
+ Error termination is initiated when the ERROR STOP statement is
+ executed, when ALLOCATE/DEALLOCATE fails without STAT= being
+ specified, when some of the co-array synchronization statements
+ fail without STAT= being specified, and some I/O errors if
+ ERR/IOSTAT/END/EOR is not present, and finally EXECUTE_COMMAND_LINE
+ failure without CMDSTAT=.
- struct rlimit core_limit;
+ 2.3.5 also explains how co-images synchronize during termination.
- if (getrlimit (RLIMIT_CORE, &core_limit) == 0 && core_limit.rlim_cur == 0)
- st_printf ("** Warning: a core dump was requested, but the core size"
- "limit\n** is currently zero.\n\n");
-#endif
-
-
-#if defined(HAVE_KILL) && defined(HAVE_GETPID) && defined(SIGQUIT)
- kill (getpid (), SIGQUIT);
-#else
- st_printf ("Core dump not possible, sorry.");
-#endif
- }
-
- exit (code);
-}
+ In libgfortran we have two ways of ending a program. exit(code) is
+ a normal exit; calling exit() also causes open units to be
+ closed. No backtrace or core dump is needed here. When something
+ goes wrong, we have sys_abort() which tries to print the backtrace
+ if -fbacktrace is enabled, and then dumps core; whether a core file
+ is generated is system dependent. When aborting, we don't flush and
+ close open units, as program memory might be corrupted and we'd
+ rather risk losing dirty data in the buffers rather than corrupting
+ files on disk.
+*/
/* Error conditions. The tricky part here is printing a message when
* it is the I/O subsystem that is severely wounded. Our goal is to
* 1 Terminated because of operating system error.
* 2 Error in the runtime library
* 3 Internal error in runtime library
- * 4 Error during error processing (very bad)
*
* Other error returns are reserved for the STOP statement with a numeric code.
*/
+
+/* Write a null-terminated C string to standard error. This function
+ is async-signal-safe. */
+
+ssize_t
+estr_write (const char *str)
+{
+ return write (STDERR_FILENO, str, strlen (str));
+}
+
+
+/* st_vprintf()-- vsnprintf-like function for error output. We use a
+ stack allocated buffer for formatting; since this function might be
+ called from within a signal handler, printing directly to stderr
+ with vfprintf is not safe since the stderr locking might lead to a
+ deadlock. */
+
+#define ST_VPRINTF_SIZE 512
+
+int
+st_vprintf (const char *format, va_list ap)
+{
+ int written;
+ char buffer[ST_VPRINTF_SIZE];
+
+#ifdef HAVE_VSNPRINTF
+ written = vsnprintf(buffer, ST_VPRINTF_SIZE, format, ap);
+#else
+ written = vsprintf(buffer, format, ap);
+
+ if (written >= ST_VPRINTF_SIZE - 1)
+ {
+ /* The error message was longer than our buffer. Ouch. Because
+ we may have messed up things badly, report the error and
+ quit. */
+#define ERROR_MESSAGE "Internal error: buffer overrun in st_vprintf()\n"
+ write (STDERR_FILENO, buffer, ST_VPRINTF_SIZE - 1);
+ write (STDERR_FILENO, ERROR_MESSAGE, strlen(ERROR_MESSAGE));
+ sys_abort ();
+#undef ERROR_MESSAGE
+
+ }
+#endif
+
+ written = write (STDERR_FILENO, buffer, written);
+ return written;
+}
+
+
+int
+st_printf (const char * format, ...)
+{
+ int written;
+ va_list ap;
+ va_start (ap, format);
+ written = st_vprintf (format, ap);
+ va_end (ap);
+ return written;
+}
+
+
+/* sys_abort()-- Terminate the program showing backtrace and dumping
+ core. */
+
+void
+sys_abort (void)
+{
+ /* If backtracing is enabled, print backtrace and disable signal
+ handler for ABRT. */
+ if (options.backtrace == 1
+ || (options.backtrace == -1 && compile_options.backtrace == 1))
+ {
+ show_backtrace ();
+ signal (SIGABRT, SIG_DFL);
+ }
+
+ abort();
+}
+
+
/* gfc_xtoa()-- Integer to hexadecimal conversion. */
const char *
return p;
}
+
+/* Hopefully thread-safe wrapper for a strerror_r() style function. */
+
+char *
+gf_strerror (int errnum,
+ char * buf __attribute__((unused)),
+ size_t buflen __attribute__((unused)))
+{
+#ifdef HAVE_STRERROR_R
+ return
+ __builtin_choose_expr (__builtin_classify_type (strerror_r (0, buf, 0))
+ == 5,
+ /* GNU strerror_r() */
+ strerror_r (errnum, buf, buflen),
+ /* POSIX strerror_r () */
+ (strerror_r (errnum, buf, buflen), buf));
+#else
+ /* strerror () is not necessarily thread-safe, but should at least
+ be available everywhere. */
+ return strerror (errnum);
+#endif
+}
+
+
/* show_locus()-- Print a line number and filename describing where
* something went wrong */
void
show_locus (st_parameter_common *cmp)
{
- static char *filename;
+ char *filename;
if (!options.locus || cmp == NULL || cmp->filename == NULL)
return;
if (cmp->unit > 0)
{
filename = filename_from_unit (cmp->unit);
+
if (filename != NULL)
{
st_printf ("At line %d of file %s (unit = %d, file = '%s')\n",
/* Don't even try to print something at this point */
if (magic == MAGIC)
- sys_exit (4);
+ sys_abort ();
magic = MAGIC;
}
+#define STRERR_MAXSZ 256
+
/* os_error()-- Operating system error. We get a message from the
* operating system, show it and leave. Some operating system errors
* are caught and processed by the library. If not, we come here. */
void
os_error (const char *message)
{
+ char errmsg[STRERR_MAXSZ];
recursion_check ();
- st_printf ("Operating system error: %s\n%s\n", get_oserror (), message);
- sys_exit (1);
+ estr_write ("Operating system error: ");
+ estr_write (gf_strerror (errno, errmsg, STRERR_MAXSZ));
+ estr_write ("\n");
+ estr_write (message);
+ estr_write ("\n");
+ exit (1);
}
iexport(os_error);
va_list ap;
recursion_check ();
- st_printf ("Fortran runtime error: ");
+ estr_write ("Fortran runtime error: ");
va_start (ap, message);
st_vprintf (message, ap);
va_end (ap);
- st_printf ("\n");
- sys_exit (2);
+ estr_write ("\n");
+ exit (2);
}
iexport(runtime_error);
va_list ap;
recursion_check ();
- st_printf ("%s\n", where);
- st_printf ("Fortran runtime error: ");
+ estr_write (where);
+ estr_write ("\nFortran runtime error: ");
va_start (ap, message);
st_vprintf (message, ap);
va_end (ap);
- st_printf ("\n");
- sys_exit (2);
+ estr_write ("\n");
+ exit (2);
}
iexport(runtime_error_at);
{
va_list ap;
- st_printf ("%s\n", where);
- st_printf ("Fortran runtime warning: ");
+ estr_write (where);
+ estr_write ("\nFortran runtime warning: ");
va_start (ap, message);
st_vprintf (message, ap);
va_end (ap);
- st_printf ("\n");
+ estr_write ("\n");
}
iexport(runtime_warning_at);
{
recursion_check ();
show_locus (cmp);
- st_printf ("Internal Error: %s\n", message);
+ estr_write ("Internal Error: ");
+ estr_write (message);
+ estr_write ("\n");
/* This function call is here to get the main.o object file included
when linking statically. This works because error.o is supposed to
because hopefully it doesn't happen too often). */
stupid_function_name_for_static_linking();
- sys_exit (3);
+ exit (3);
}
void
generate_error (st_parameter_common *cmp, int family, const char *message)
{
+ char errmsg[STRERR_MAXSZ];
/* If there was a previous error, don't mask it with another
error message, EOF or EOR condition. */
if (message == NULL)
message =
- (family == LIBERROR_OS) ? get_oserror () : translate_error (family);
+ (family == LIBERROR_OS) ? gf_strerror (errno, errmsg, STRERR_MAXSZ) :
+ translate_error (family);
if (cmp->flags & IOPARM_HAS_IOMSG)
cf_strcpy (cmp->iomsg, cmp->iomsg_len, message);
recursion_check ();
show_locus (cmp);
- st_printf ("Fortran runtime error: %s\n", message);
- sys_exit (2);
+ estr_write ("Fortran runtime error: ");
+ estr_write (message);
+ estr_write ("\n");
+ exit (2);
}
iexport(generate_error);
message = " ";
show_locus (cmp);
- st_printf ("Fortran runtime warning: %s\n", message);
+ estr_write ("Fortran runtime warning: ");
+ estr_write (message);
+ estr_write ("\n");
}
{
recursion_check ();
show_locus (cmp);
- st_printf ("Fortran runtime error: %s\n", message);
- sys_exit (2);
+ estr_write ("Fortran runtime error: ");
+ estr_write (message);
+ estr_write ("\n");
+ exit (2);
}
else
{
show_locus (cmp);
- st_printf ("Fortran runtime warning: %s\n", message);
+ estr_write ("Fortran runtime warning: ");
+ estr_write (message);
+ estr_write ("\n");
}
return FAILURE;
}
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