Bug 12860
| Summary: | Re: resend: uthread_init.c PANICs in case of (legally) close stdin | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Lawrence D. Lopez <lawlopez> |
| Component: | bin | Assignee: | GNATS administrator <gnats-admin> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | CC: | FreeBSD-gnats-submit |
| Priority: | Normal | ||
| Version: | 1.0-RELEASE | ||
| Hardware: | Any | ||
| OS: | Any | ||
State Changed From-To: open->closed Mis-filed en route to PR 12853. |
This is a multi-part message in MIME format. --------------BD951E80393B91190D1AEB4A Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Dan, Test procedure: attached is a tarfile which contains the test procedure. *** extract it from the mail. tar xcv tarfile cd thread make *** This is what is in the tarfile: makefile: all: rm -f run thread *.core cc -o thread thread.c -lc_r cc -o run run.c ./run Program 1: thread.c: main() { } Compile it like: cc -o thread thread.c -lc_r Program 2: run.c main() { close(0); execl("./thread", "./thead", 0); perror("execl"); } Compile it like: cc -o run run.c Now type ./run to cause the bug: ./run Fatal error 'Cannot get stdio flags' at line ? in file /usr/src/lib/libc_r/uthread/uthread_init.c (errno = ?) Segmentation fault (core dumped) Hope this helps! Larry Daniel Eischen wrote: > > Wow, this CC: list is growing! > > Can you please try this more complete patch (made against -stable)? > I believe it better handles initialization of the fd tables for fds > < 3. > > Index: uthread_fd.c > =================================================================== > RCS file: /A/cvs/src/lib/libc_r/uthread/uthread_fd.c,v > retrieving revision 1.9.2.2 > diff -u -r1.9.2.2 uthread_fd.c > --- uthread_fd.c 1999/07/23 13:00:27 1.9.2.2 > +++ uthread_fd.c 1999/07/28 16:31:33 > @@ -94,13 +94,13 @@ > TAILQ_INIT(&entry->w_queue); > > /* Get the flags for the file: */ > - if (fd >= 3 && (entry->flags = > - _thread_sys_fcntl(fd, F_GETFL, 0)) == -1) { > + if (((fd >= 3) || (_pthread_stdio_flags[fd] == -1)) && > + (entry->flags = _thread_sys_fcntl(fd, F_GETFL, 0)) == -1) { > ret = -1; > - } > + } > else { > /* Check if a stdio descriptor: */ > - if (fd < 3) > + if ((fd < 3) && (_pthread_stdio_flags[fd] != -1)) > /* > * Use the stdio flags read by > * _pthread_init() to avoid > Index: uthread_init.c > =================================================================== > RCS file: /A/cvs/src/lib/libc_r/uthread/uthread_init.c,v > retrieving revision 1.9.2.3 > diff -u -r1.9.2.3 uthread_init.c > --- uthread_init.c 1999/07/23 13:00:29 1.9.2.3 > +++ uthread_init.c 1999/07/28 16:43:27 > @@ -121,8 +121,9 @@ > > /* Get the standard I/O flags before messing with them : */ > for (i = 0; i < 3; i++) > - if ((_pthread_stdio_flags[i] = > - _thread_sys_fcntl(i,F_GETFL, NULL)) == -1) > + if (((_pthread_stdio_flags[i] = > + _thread_sys_fcntl(i,F_GETFL, NULL)) == -1) && > + (errno != EBADF)) > PANIC("Cannot get stdio flags"); > > /* > @@ -292,12 +293,18 @@ > } > > /* Initialize stdio file descriptor table entries: */ > - if ((_thread_fd_table_init(0) != 0) || > - (_thread_fd_table_init(1) != 0) || > - (_thread_fd_table_init(2) != 0)) { > - PANIC("Cannot initialize stdio file descriptor " > - "table entries"); > - } > + if ((_thread_fd_table_init(0) != 0) && > + (errno != EBADF)) > + PANIC("Cannot initialize stdio file " > + "descriptor table entries"); > + else if ((_thread_fd_table_init(1) != 0) && > + (errno != EBADF)) > + PANIC("Cannot initialize stdout file " > + "descriptor table entries"); > + else if ((_thread_fd_table_init(2) != 0) && > + (errno != EBADF)) > + PANIC("Cannot initialize stderr file " > + "descriptor table entries"); > } > } > > > Dan Eischen > eischen@vigrid.com --------------BD951E80393B91190D1AEB4A Content-Type: application/octet-stream; name="tarfile" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="tarfile" dGhyZWFkLwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACA0MDc1NSAA ICAxNzU1IAAgIDE3NTUgACAgICAgICAgICAwICA2NzQ3NzEzMDExICAxMjI0NQAgNQAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAB1c3RhciAgAGxhd2xv 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