sim: ppc: track closed state of file descriptors 0, 1, and 2.
This change tracks the "closed" state of file descriptors 0, 1, and 2, introducing the function fdbad() to emul_netbsd.c and emul_unix.c. Note that a function of the same name and purpose exists in sim/common/callback.c. This patch eliminates all of the "unresolved testcases" when testing GDB against the powerpc simulator. This occurs because the powerpc simulator closes, on behalf of the testcase, the file descriptors associated with stdin, stdout, and stderr. GDB still needs these descriptors to communicate with the user or, in this case, with the testing framework.
This commit is contained in:
Kevin Buettner
Mike Frysinger
parent
090d9d00b5
commit
90d99f3270
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@ -1,3 +1,17 @@
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2015-12-29 Kevin Buettner <kevinb@redhat.com>
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* emul_netbsd.c (fd_closed): New static array.
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(fdbad): New function.
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(do_read, do_write, do_close, do_dup, do_ioctl, do_dup2, do_fcntl)
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(do_fstatfs, do_fstat, do_lseek): Call `fdbad'.
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(emul_netbsd_init): Initialize `fd_closed'.
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* emul_unix.c (fd_closed): New static array.
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(fdbad): New function.
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(do_unix_read, do_unix_write, do_unix_close, do_unix_dup)
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(do_unix_dup2, do_unix_lseek, do_solaris_fstat, do_solaris_ioctl)
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(do_linux_fstat, do_linux_ioctl): Call `fdbad'.
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(emul_solaris_init, emul_linux_init): Initialize `fd_closed'.
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2015-12-26 Mike Frysinger <vapier@gentoo.org>
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* Makefile.in (TCONFIG_H): Delete.
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@ -292,6 +292,31 @@ write_rusage(unsigned_word addr,
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}
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#endif
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/* File descriptors 0, 1, and 2 should not be closed. fd_closed[]
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tracks whether these descriptors have been closed in do_close()
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below. */
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static int fd_closed[3];
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/* Check for some occurrences of bad file descriptors. We only check
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whether fd 0, 1, or 2 are "closed". By "closed" we mean that these
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descriptors aren't actually closed, but are considered to be closed
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by this layer.
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Other checks are performed by the underlying OS call. */
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static int
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fdbad (int fd)
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{
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if (fd >=0 && fd <= 2 && fd_closed[fd])
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{
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errno = EBADF;
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return -1;
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}
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return 0;
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}
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static void
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do_exit(os_emul_data *emul,
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unsigned call,
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@ -339,7 +364,9 @@ do_read(os_emul_data *emul,
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status = -1;
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}
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#endif
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status = read (d, scratch_buffer, nbytes);
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status = fdbad (d);
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if (status == 0)
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status = read (d, scratch_buffer, nbytes);
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emul_write_status(processor, status, errno);
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if (status > 0)
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@ -374,7 +401,10 @@ do_write(os_emul_data *emul,
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processor, cia);
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/* write */
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status = write(d, scratch_buffer, nbytes);
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status = fdbad (d);
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if (status == 0)
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status = write(d, scratch_buffer, nbytes);
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emul_write_status(processor, status, errno);
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free(scratch_buffer);
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@ -440,8 +470,20 @@ do_close(os_emul_data *emul,
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SYS(close);
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/* Can't combine these statements, cuz close sets errno. */
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status = close(d);
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status = fdbad (d);
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if (status == 0)
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{
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/* Do not close stdin, stdout, or stderr. GDB may still need access to
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these descriptors. */
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if (d == 0 || d == 1 || d == 2)
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{
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fd_closed[d] = 1;
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status = 0;
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}
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else
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status = close(d);
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}
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emul_write_status(processor, status, errno);
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}
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@ -549,7 +591,7 @@ do_dup(os_emul_data *emul,
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unsigned_word cia)
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{
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int oldd = cpu_registers(processor)->gpr[arg0];
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int status = dup(oldd);
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int status = (fdbad (oldd) < 0) ? -1 : dup(oldd);
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int err = errno;
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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@ -640,7 +682,9 @@ do_ioctl(os_emul_data *emul,
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|| dir & IOC_OUT
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|| !(dir & IOC_VOID))
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error("do_ioctl() read or write of parameter not implemented\n");
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status = ioctl(d, request, NULL);
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status = fdbad (d);
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if (status == 0)
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status = ioctl(d, request, NULL);
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emul_write_status(processor, status, errno);
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#endif
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@ -681,7 +725,7 @@ do_dup2(os_emul_data *emul,
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{
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int oldd = cpu_registers(processor)->gpr[arg0];
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int newd = cpu_registers(processor)->gpr[arg0+1];
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int status = dup2(oldd, newd);
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int status = (fdbad (oldd) < 0) ? -1 : dup2(oldd, newd);
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int err = errno;
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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@ -711,7 +755,9 @@ do_fcntl(os_emul_data *emul,
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printf_filtered ("%d, %d, %d", fd, cmd, arg);
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SYS(fcntl);
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status = fcntl(fd, cmd, arg);
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status = fdbad (fd);
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if (status == 0)
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status = fcntl(fd, cmd, arg);
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emul_write_status(processor, status, errno);
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}
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#endif
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@ -796,7 +842,9 @@ do_fstatfs(os_emul_data *emul,
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printf_filtered ("%d, 0x%lx", fd, (long)buf_addr);
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SYS(fstatfs);
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status = fstatfs(fd, (buf_addr == 0 ? NULL : &buf));
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status = fdbad (fd);
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if (status == 0)
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status = fstatfs(fd, (buf_addr == 0 ? NULL : &buf));
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emul_write_status(processor, status, errno);
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if (status == 0) {
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if (buf_addr != 0)
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@ -849,7 +897,9 @@ do_fstat(os_emul_data *emul,
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SYS(fstat);
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#endif
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/* Can't combine these statements, cuz fstat sets errno. */
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status = fstat(fd, &buf);
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status = fdbad (fd);
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if (status == 0)
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status = fstat(fd, &buf);
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emul_write_status(processor, status, errno);
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write_stat(stat_buf_addr, buf, processor, cia);
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}
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@ -951,7 +1001,9 @@ do_lseek(os_emul_data *emul,
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int whence = cpu_registers(processor)->gpr[arg0+4];
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off_t status;
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SYS(lseek);
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status = lseek(fildes, offset, whence);
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status = fdbad (fildes);
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if (status == 0)
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status = lseek(fildes, offset, whence);
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if (status == -1)
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emul_write_status(processor, -1, errno);
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else {
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@ -1450,7 +1502,9 @@ static void
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emul_netbsd_init(os_emul_data *emul_data,
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int nr_cpus)
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{
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/* nothing yet */
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fd_closed[0] = 0;
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fd_closed[1] = 0;
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fd_closed[2] = 0;
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}
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static void
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@ -195,6 +195,30 @@ struct unix_rusage {
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};
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/* File descriptors 0, 1, and 2 should not be closed. fd_closed[]
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tracks whether these descriptors have been closed in do_close()
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below. */
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static int fd_closed[3];
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/* Check for some occurrences of bad file descriptors. We only check
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whether fd 0, 1, or 2 are "closed". By "closed" we mean that these
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descriptors aren't actually closed, but are considered to be closed
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by this layer.
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Other checks are performed by the underlying OS call. */
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static int
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fdbad (int fd)
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{
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if (fd >=0 && fd <= 2 && fd_closed[fd])
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{
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errno = EBADF;
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return -1;
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}
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return 0;
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}
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static void
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do_unix_exit(os_emul_data *emul,
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unsigned call,
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@ -232,8 +256,10 @@ do_unix_read(os_emul_data *emul,
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/* check if buffer exists by reading it */
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emul_read_buffer(scratch_buffer, buf, nbytes, processor, cia);
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status = fdbad (d);
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/* read */
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status = read (d, scratch_buffer, nbytes);
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if (status == 0)
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status = read (d, scratch_buffer, nbytes);
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emul_write_status(processor, status, errno);
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if (status > 0)
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@ -266,8 +292,10 @@ do_unix_write(os_emul_data *emul,
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emul_read_buffer(scratch_buffer, buf, nbytes,
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processor, cia);
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status = fdbad (d);
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/* write */
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status = write(d, scratch_buffer, nbytes);
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if (status == 0)
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status = write(d, scratch_buffer, nbytes);
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emul_write_status(processor, status, errno);
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free(scratch_buffer);
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@ -310,7 +338,20 @@ do_unix_close(os_emul_data *emul,
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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printf_filtered ("%d", d);
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status = close(d);
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status = fdbad (d);
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if (status == 0)
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{
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/* Do not close stdin, stdout, or stderr. GDB may still need access to
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these descriptors. */
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if (d == 0 || d == 1 || d == 2)
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{
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fd_closed[d] = 1;
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status = 0;
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}
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else
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status = close(d);
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}
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emul_write_status(processor, status, errno);
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}
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@ -490,7 +531,7 @@ do_unix_dup(os_emul_data *emul,
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unsigned_word cia)
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{
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int oldd = cpu_registers(processor)->gpr[arg0];
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int status = dup(oldd);
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int status = (fdbad (oldd) < 0) ? -1 : dup(oldd);
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int err = errno;
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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@ -512,7 +553,7 @@ do_unix_dup2(os_emul_data *emul,
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{
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int oldd = cpu_registers(processor)->gpr[arg0];
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int newd = cpu_registers(processor)->gpr[arg0+1];
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int status = dup2(oldd, newd);
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int status = (fdbad (oldd) < 0) ? -1 : dup2(oldd, newd);
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int err = errno;
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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@ -540,7 +581,9 @@ do_unix_lseek(os_emul_data *emul,
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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printf_filtered ("%d %ld %d", fildes, (long)offset, whence);
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status = lseek(fildes, offset, whence);
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status = fdbad (fildes);
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if (status == 0)
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status = lseek(fildes, offset, whence);
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emul_write_status(processor, (int)status, errno);
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}
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#endif
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@ -1196,7 +1239,9 @@ do_solaris_fstat(os_emul_data *emul,
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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printf_filtered ("%d, 0x%lx", fildes, (long)stat_pkt);
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status = fstat (fildes, &buf);
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status = fdbad (fildes);
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if (status == 0)
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status = fstat (fildes, &buf);
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if (status == 0)
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convert_to_solaris_stat (stat_pkt, &buf, processor, cia);
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@ -1433,6 +1478,10 @@ do_solaris_ioctl(os_emul_data *emul,
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#endif
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#endif
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status = fdbad (fildes);
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if (status != 0)
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goto done;
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switch (request)
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{
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case 0: /* make sure we have at least one case */
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@ -1474,6 +1523,7 @@ do_solaris_ioctl(os_emul_data *emul,
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#endif /* HAVE_TERMIOS_STRUCTURE */
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}
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done:
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emul_write_status(processor, status, errno);
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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@ -1925,7 +1975,9 @@ static void
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emul_solaris_init(os_emul_data *emul_data,
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int nr_cpus)
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{
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/* nothing yet */
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fd_closed[0] = 0;
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fd_closed[1] = 0;
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fd_closed[2] = 0;
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}
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static void
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@ -2124,7 +2176,9 @@ do_linux_fstat(os_emul_data *emul,
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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printf_filtered ("%d, 0x%lx", fildes, (long)stat_pkt);
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status = fstat (fildes, &buf);
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status = fdbad (fildes);
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if (status == 0)
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status = fstat (fildes, &buf);
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if (status == 0)
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convert_to_linux_stat (stat_pkt, &buf, processor, cia);
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@ -2388,6 +2442,10 @@ do_linux_ioctl(os_emul_data *emul,
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#endif
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#endif
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status = fdbad (fildes);
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if (status != 0)
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goto done;
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switch (request)
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{
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case 0: /* make sure we have at least one case */
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@ -2429,6 +2487,7 @@ do_linux_ioctl(os_emul_data *emul,
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#endif /* HAVE_TERMIOS_STRUCTURE */
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}
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done:
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emul_write_status(processor, status, errno);
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if (WITH_TRACE && ppc_trace[trace_os_emul])
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@ -2795,7 +2854,9 @@ static void
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emul_linux_init(os_emul_data *emul_data,
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int nr_cpus)
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{
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/* nothing yet */
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fd_closed[0] = 0;
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fd_closed[1] = 0;
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fd_closed[2] = 0;
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}
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static void
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