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* src/fileio.c (check_writable) [CYGWIN]: Return non-zero if UID or

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GID is unknown (Bug#10257).
This commit is contained in:
Ken Brown 2011-12-17 12:00:49 -05:00
parent e1fefc61a4
commit e1b01a3a53
2 changed files with 20 additions and 3 deletions
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5
src/ChangeLog
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@ -1,3 +1,8 @@
2011-12-17 Ken Brown <kbrown@cornell.edu>
* fileio.c (check_writable) [CYGWIN]: Return non-zero if UID or
GID is unknown (Bug#10257).
2011-12-17 Paul Eggert <eggert@cs.ucla.edu>
* s/gnu-linux.h: Fix mark_memory typo (Bug#10286).

18
src/fileio.c
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@ -2416,15 +2416,27 @@ check_writable (const char *filename)
return (st.st_mode & S_IWRITE || S_ISDIR (st.st_mode));
#else /* not MSDOS */
#ifdef HAVE_EUIDACCESS
return (euidaccess (filename, 2) >= 0);
#else
int res = (euidaccess (filename, 2) >= 0);
#ifdef CYGWIN
/* euidaccess may have returned failure because Cygwin couldn't
determine the file's UID or GID; if so, we return success. */
if (!res)
{
struct stat st;
if (stat (filename, &st) < 0)
return 0;
res = (st.st_uid == -1 || st.st_gid == -1);
}
#endif /* CYGWIN */
return res;
#else /* not HAVE_EUIDACCESS */
/* Access isn't quite right because it uses the real uid
and we really want to test with the effective uid.
But Unix doesn't give us a right way to do it.
Opening with O_WRONLY could work for an ordinary file,
but would lose for directories. */
return (access (filename, 2) >= 0);
#endif
#endif /* not HAVE_EUIDACCESS */
#endif /* not MSDOS */
}