How do I check whether stdout==stderr or not?
e.g., I want to distinguish between these situations:
$ foo
$ foo > log
$ foo 1>log1 2>log2
struct stat statbuf1;
struct stat statbuf2;
fstat(handle1,&statbuf1)
fstat(handle2,&statbuf2)
if (statbuf1.st_dev == statbuf2.st_dev
&& statbuf1.st_ino == statbuf2.st_ino) {
/* handle1 and handle2 point to the same inode. */
if ((S_ISREG(statbuf1.st_mode) || S_ISBLK(statbuf1.st_mode))
&& (S_ISREG(statbuf2.st_mode) || S_ISBLK(statbuf2.st_mode))) {
/* handle1 and handle2 are exchangeable only if they are positioned
at the same file position. */
off_t pos1 = lseek(handle1,0,SEEK_CUR);
if (pos1 >= 0) {
off_t pos2 = lseek(handle2,0,SEEK_CUR);
if (pos2 >= 0)
return (pos1 == pos2);
}
}
return true;
} else
return false;
alas, the current cygwin reports different inodes for stdout and stderr:
-437397064 and 593767114
so, what is the right way to check that two FDs refer to the
same device?
Thanks!
--
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