diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/redir.c | 77 |
1 files changed, 15 insertions, 62 deletions
diff --git a/src/redir.c b/src/redir.c index b4e49c0..f96a76b 100644 --- a/src/redir.c +++ b/src/redir.c @@ -84,7 +84,6 @@ STATIC void dupredirect(union node *, int, char[10]); STATIC void dupredirect(union node *, int); #endif STATIC int openhere(union node *); -STATIC int noclobberopen(const char *); /* @@ -168,6 +167,7 @@ redirect(union node *redir, int flags) STATIC int openredirect(union node *redir) { + struct stat64 sb; char *fname; int f; @@ -186,8 +186,21 @@ openredirect(union node *redir) /* Take care of noclobber mode. */ if (Cflag) { fname = redir->nfile.expfname; - if ((f = noclobberopen(fname)) < 0) + if (stat64(fname, &sb) < 0) { + if ((f = open64(fname, O_WRONLY|O_CREAT|O_EXCL, 0666)) < 0) + goto ecreate; + } else if (!S_ISREG(sb.st_mode)) { + if ((f = open64(fname, O_WRONLY, 0666)) < 0) + goto ecreate; + if (fstat64(f, &sb) < 0 && S_ISREG(sb.st_mode)) { + close(f); + errno = EEXIST; + goto ecreate; + } + } else { + errno = EEXIST; goto ecreate; + } break; } /* FALLTHROUGH */ @@ -397,66 +410,6 @@ savefd(int from, int ofd) } -/* - * Open a file in noclobber mode. - * The code was copied from bash. - */ -int -noclobberopen(fname) - const char *fname; -{ - int r, fd; - struct stat64 finfo, finfo2; - - /* - * If the file exists and is a regular file, return an error - * immediately. - */ - r = stat64(fname, &finfo); - if (r == 0 && S_ISREG(finfo.st_mode)) { - errno = EEXIST; - return -1; - } - - /* - * If the file was not present (r != 0), make sure we open it - * exclusively so that if it is created before we open it, our open - * will fail. Make sure that we do not truncate an existing file. - * Note that we don't turn on O_EXCL unless the stat failed -- if the - * file was not a regular file, we leave O_EXCL off. - */ - if (r != 0) - return open64(fname, O_WRONLY|O_CREAT|O_EXCL, 0666); - fd = open64(fname, O_WRONLY|O_CREAT, 0666); - - /* If the open failed, return the file descriptor right away. */ - if (fd < 0) - return fd; - - /* - * OK, the open succeeded, but the file may have been changed from a - * non-regular file to a regular file between the stat and the open. - * We are assuming that the O_EXCL open handles the case where FILENAME - * did not exist and is symlinked to an existing file between the stat - * and open. - */ - - /* - * If we can open it and fstat the file descriptor, and neither check - * revealed that it was a regular file, and the file has not been - * replaced, return the file descriptor. - */ - if (fstat64(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) && - finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino) - return fd; - - /* The file has been replaced. badness. */ - close(fd); - errno = EEXIST; - return -1; -} - - int redirectsafe(union node *redir, int flags) { |