/* This file is part of the program psim.
Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
+ Copyright (C) 1998, Cygnus Solutions.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "sim-io.h"
#include "targ-vals.h"
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+
/* See the file include/callbacks.h for a description */
}
-static char *
-sim_io_getstring(SIM_DESC sd,
- sim_cpu *cpu,
- address_word cia,
- address_word target_string)
-{
- int len = 0;
- char *buf;
+/* Based on gdb-4.17/sim/ppc/main.c:sim_io_read_stdin().
- while (sim_core_read_1 (cpu, cia, sim_core_read_map, target_string+len) != 0)
- len++;
+ FIXME: Should not be calling fcntl() or grubbing around inside of
+ ->fdmap and ->errno.
- buf = NZALLOC (char, len+1);
- buf[len] = '\0';
- sim_core_read_buffer (sd, cpu, sim_core_read_map, buf, target_string, len);
- return buf;
-}
+ FIXME: Some completly new mechanism for handling the general
+ problem of asynchronous IO is needed.
-void
-sim_io_syscalls(SIM_DESC sd,
- int syscall,
- address_word cia,
- address_word parm1,
- address_word parm2,
- address_word parm3,
- address_word parm4,
- address_word *syscall_return,
- address_word *errno_return)
-{
- sim_cpu *cpu = STATE_CPU (sd, 0);
- struct host_callback_struct *callback = STATE_CALLBACK (sd);
- int len, len2, len3;
- int ret;
- char *buf;
- int fd;
+ FIXME: This function does not supress the echoing (ECHO) of input.
+ Consequently polled input is always displayed.
+
+ FIXME: This function does not perform uncooked reads.
+ Consequently, data will not be read until an EOLN character has
+ been entered. A cntrl-d may force the early termination of a line */
- *errno_return = 0;
- *syscall_return = 0;
- switch (syscall)
+int
+sim_io_poll_read (SIM_DESC sd,
+ int sim_io_fd,
+ char *buf,
+ int sizeof_buf)
+{
+#if defined(O_NDELAY) && defined(F_GETFL) && defined(F_SETFL)
+ int fd = STATE_CALLBACK (sd)->fdmap[sim_io_fd];
+ int flags;
+ int status;
+ int nr_read;
+ int result;
+ STATE_CALLBACK (sd)->last_errno = 0;
+ /* get the old status */
+ flags = fcntl (fd, F_GETFL, 0);
+ if (flags == -1)
{
- case 1: /* exit (status) */
- sim_engine_halt (sd, STATE_CPU (sd, 0), NULL, cia, sim_exited, parm1);
- break;
-
- case 2: /* open (filename, flags, mode) */
- buf = sim_io_getstring (sd, cpu, cia, parm1);
- ret = *syscall_return = callback->open (callback, buf, parm2);
- if (ret < 0)
- *errno_return = callback->get_errno (callback);
-
- zfree (buf);
- break;
-
- case 3: /* close (filedes) */
- ret = *syscall_return = callback->close (callback, parm1);
- if (ret < 0)
- *errno_return = callback->get_errno (callback);
- break;
-
- case 4: /* read (filedes, buffer, len) */
- fd = parm1;
- len = parm3;
- buf = NZALLOC (char, len);
-
- if (fd == 0)
- len2 = sim_io_read_stdin (sd, buf, len);
- else
- len2 = sim_io_read (sd, fd, buf, len);
-
- if (len2 > 0)
- {
- len3 = sim_core_write_buffer (sd, cpu, sim_core_write_map, buf, parm2,
- len);
-
- if (len3 < len2)
- sim_engine_abort (sd, cpu, cia,
- "Could only write back %d bytes for read system call, wanted to write %d\n",
- len3, len2);
-
- *syscall_return = len2;
- }
- else
- *errno_return = callback->get_errno (callback);
-
- zfree (buf);
- break;
-
- case 5: /* write (filedes, buffer, len) */
- fd = parm1;
- len = parm3;
- buf = NZALLOC (char, len);
-
- len = sim_core_read_buffer (sd, cpu, sim_core_read_map, buf, parm2, len);
- if (fd == 1)
- {
- len2 = sim_io_write_stdout (sd, buf, len);
- sim_io_flush_stdout (sd);
- }
- else if (fd == 2)
- {
- len2 = sim_io_write_stderr (sd, buf, len);
- sim_io_flush_stderr (sd);
- }
- else
- len2 = sim_io_write (sd, fd, buf, len);
-
- if (len2 > 0)
- *syscall_return = len2;
- else
- *errno_return = callback->get_errno (callback);
-
- zfree (buf);
- break;
-
- case 6: /* lseek (filedes, offset, whence) */
- *errno_return = TARGET_ENOSYS;
- break;
-
- case 7: /* unlink (filename) */
- buf = sim_io_getstring (sd, cpu, cia, parm1);
- ret = *syscall_return = callback->unlink (callback, buf);
- if (ret < 0)
- *errno_return = callback->get_errno (callback);
-
- zfree (buf);
- break;
-
- case 8: /* getpid () */
- case 9: /* kill (signal, pid) */
- case 10: /* fstat (filedes, packet) */
- case 11: /* reserved for sbrk */
- case 12: /* argvlen () */
- case 13: /* argv () */
- case 14: /* chdir (dir) */
- case 15: /* stat (filename, packet) */
- case 16: /* chmod (filename, mode) */
- case 17: /* utime (filename, packet) */
- case 18: /* time (time_t *) */
- *errno_return = TARGET_ENOSYS;
- break;
-
- default:
- sim_engine_abort (sd, cpu, cia, "Unknown monitor call %d", syscall);
- break;
+ perror ("sim_io_poll_read");
+ return 0;
}
-
- if (*errno_return)
- *syscall_return = -1;
-
- return;
+ /* temp, disable blocking IO */
+ status = fcntl (fd, F_SETFL, flags | O_NDELAY);
+ if (status == -1)
+ {
+ perror ("sim_io_read_stdin");
+ return 0;
+ }
+ /* try for input */
+ nr_read = read (fd, buf, sizeof_buf);
+ if (nr_read >= 0)
+ {
+ /* printf ("<nr-read=%d>\n", nr_read); */
+ result = nr_read;
+ }
+ else
+ { /* nr_read < 0 */
+ result = -1;
+ STATE_CALLBACK (sd)->last_errno = errno;
+ }
+ /* return to regular vewing */
+ status = fcntl (fd, F_SETFL, flags);
+ if (status == -1)
+ {
+ perror ("sim_io_read_stdin");
+ /* return 0; */
+ }
+ return result;
+#else
+ return sim_io_read (sd, sim_io_fd, buf, sizeof_buf);
+#endif
}
-
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