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author | Jason Merrill <jason@gcc.gnu.org> | 1997-08-21 18:57:35 -0400 |
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committer | Jason Merrill <jason@gcc.gnu.org> | 1997-08-21 18:57:35 -0400 |
commit | 6599da043e22e96ac830fb50a61c1b6d95d1b142 (patch) | |
tree | a3b19970338bdae580faff126a716e1d5520400c /libiberty/fdmatch.c | |
parent | 8975416cfb6269ad94b6330d42960cca8b0925b7 (diff) | |
download | gcc-6599da043e22e96ac830fb50a61c1b6d95d1b142.zip gcc-6599da043e22e96ac830fb50a61c1b6d95d1b142.tar.gz gcc-6599da043e22e96ac830fb50a61c1b6d95d1b142.tar.bz2 |
Initial revision
From-SVN: r14877
Diffstat (limited to 'libiberty/fdmatch.c')
-rw-r--r-- | libiberty/fdmatch.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/libiberty/fdmatch.c b/libiberty/fdmatch.c new file mode 100644 index 0000000..7af039f --- /dev/null +++ b/libiberty/fdmatch.c @@ -0,0 +1,73 @@ +/* Compare two open file descriptors to see if they refer to the same file. + Copyright (C) 1991 Free Software Foundation, Inc. + +This file is part of the libiberty library. +Libiberty is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public +License as published by the Free Software Foundation; either +version 2 of the License, or (at your option) any later version. + +Libiberty is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with libiberty; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. */ + + +/* + +NAME + + fdmatch -- see if two file descriptors refer to same file + +SYNOPSIS + + int fdmatch (int fd1, int fd2) + +DESCRIPTION + + Check to see if two open file descriptors refer to the same file. + This is useful, for example, when we have an open file descriptor + for an unnamed file, and the name of a file that we believe to + correspond to that fd. This can happen when we are exec'd with + an already open file (stdout for example) or from the SVR4 /proc + calls that return open file descriptors for mapped address spaces. + All we have to do is open the file by name and check the two file + descriptors for a match, which is done by comparing major&minor + device numbers and inode numbers. + +BUGS + + (FIXME: does this work for networks?) + It works for NFS, which assigns a device number to each mount. + +*/ + +#include "ansidecl.h" +#include "libiberty.h" +#include <sys/types.h> +#include <sys/stat.h> + +int fdmatch (fd1, fd2) + int fd1; + int fd2; +{ + struct stat sbuf1; + struct stat sbuf2; + + if ((fstat (fd1, &sbuf1) == 0) && + (fstat (fd2, &sbuf2) == 0) && + (sbuf1.st_dev == sbuf2.st_dev) && + (sbuf1.st_ino == sbuf2.st_ino)) + { + return (1); + } + else + { + return (0); + } +} |