Re: fclose(stdout)

[Andreas Jaeger <aj@arthur.rhein-neckar.de>]

>>>>> Jonathan Larmour writes:

 > The following case crashes with a SEGV on my glibc 2.1 system. But I can't
 > see any changes in 2.1.1 that would have fixed this. Any ideas?

Most probably a broken installation of glibc or egcs.  Do you have in
/usr/include or /usr/local/include some old glibc 2.0 or libc5 headers
instead of glibc 2.1 headers ?

Andreas
 > #include <stdio.h>

 > int main()
 > {
 >     printf("hi\n");
 >     fclose(stdout);
 >     return 0;
 > }

 > Program received signal SIGSEGV, Segmentation fault.
 > 0x4006aa70 in _IO_new_fclose (fp=0x8049630) at iofclose.c:45
 > iofclose.c:45: No such file or directory.
 > (gdb) bt
 > #0  0x4006aa70 in _IO_new_fclose (fp=0x8049630) at iofclose.c:45
 > #1  0x80484da in main () at fff.c:6
 > (gdb) p *fp
 > $1 = {_flags = -72539124, _IO_read_ptr = 0x0, _IO_read_end = 0x0,
 > _IO_read_base = 0x0, 
 >   _IO_write_base = 0x0, _IO_write_ptr = 0x0, _IO_write_end = 0x0,
 > _IO_buf_base = 0x0, 
 >   _IO_buf_end = 0x0, _IO_save_base = 0x0, _IO_backup_base = 0x0,
 > _IO_save_end = 0x0, 
 >   _markers = 0x0, _chain = 0x40102400, _fileno = -1, _blksize = 0,
 > _old_offset = -1, 
 >   _cur_column = 0, _vtable_offset = -72 '¸', _shortbuf = "", _lock =
 > 0x40102450, _offset = -1, 
 >   _unused2 = {0, 0, 134518092, 0, 0, 1074810016, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 > 0}}
 > (gdb) p stdout
 > $2 = (FILE *) 0x8049630

 > As a result of this a rebuild of egcs cpp now segfaults the same way at
 > cccp.c:2183 (current CVS). I have the impression that this probably *is*
 > fixed, so its just a matter of knowing where/when. Ideas? Installation
 > problem?

 > Jifl

-- 
 Andreas Jaeger   aj@arthur.rhein-neckar.de    jaeger@informatik.uni-kl.de
  for pgp-key finger ajaeger@aixd1.rhrk.uni-kl.de