diff options
Diffstat (limited to 'lsfd-cmd/decode-file-flags.c')
| -rw-r--r-- | lsfd-cmd/decode-file-flags.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/lsfd-cmd/decode-file-flags.c b/lsfd-cmd/decode-file-flags.c new file mode 100644 index 0000000000..bd87c7d794 --- /dev/null +++ b/lsfd-cmd/decode-file-flags.c @@ -0,0 +1,148 @@ +/* + * lsfd(1) - list file descriptors + * + * Copyright (C) 2022 Red Hat, Inc. All rights reserved. + * Written by Masatake YAMATO <yamato@redhat.com> + * + * Very generally based on lsof(8) by Victor A. Abell <abe@purdue.edu> + * It supports multiple OSes. lsfd specializes to Linux. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* lsfd_decode_file_flags() is for decoding `flags' field of + * /proc/$pid/fdinfo/$fd. Bits of the field have name defined + * in fctl.h. + * A system on which lsfd is built may have multiple + * fctl.h files: + * + * - /usr/include/asm/fcntl.h (a part of Linux kernel) + * - /usr/include/asm-generic/fcntl.h (a part of Linux kernel) + * - /usr/include/fcntl.h (a part of glibc) + * - /usr/include/bits/fcntl.h (a part of glibc) + * + * For decoding purpose, /usr/include/asm/fcntl.h or + * /usr/include/asm-generic/fcntl.h is needed. + * + * /usr/include/bits/fcntl.h and /usr/include/fcntl.h are + * not suitable for decoding. They should not be included. + * /usr/include/fcntl.h includes /usr/include/bits/fcntl.h. + */ + +#if defined HAVE_ASM_FCNTL_H +#include <asm/fcntl.h> +#elif defined HAVE_ASM_GENERIC_FCNTL_H +#include <asm-generic/fcntl.h> +#else +#error "kernel's fcntl.h is not available" +#endif + +#include <stddef.h> /* for size_t */ +struct ul_buffer; + +void lsfd_decode_file_flags(struct ul_buffer *buf, int flags); + +/* We cannot include buffer.h because buffer.h includes + * /usr/include/fcntl.h indirectly. */ +extern int ul_buffer_is_empty(struct ul_buffer *buf); +extern int ul_buffer_append_data(struct ul_buffer *buf, const char *data, size_t sz); +extern int ul_buffer_append_string(struct ul_buffer *buf, const char *str); + +void lsfd_decode_file_flags(struct ul_buffer *buf, int flags) +{ +#define SET_FLAG_FULL(L,s) \ + do { \ + if (flags & (L)) { \ + if (!ul_buffer_is_empty(buf)) \ + ul_buffer_append_data(buf, ",", 1); \ + ul_buffer_append_string(buf, #s); \ + } \ + } while (0) + +#define SET_FLAG(L,s) SET_FLAG_FULL(O_##L,s) + +#ifdef O_WRONLY + SET_FLAG(WRONLY,wronly); +#endif + +#ifdef O_RDWR + SET_FLAG(RDWR,rdwr); +#endif + +#ifdef O_CREAT + SET_FLAG(CREAT,creat); +#endif + +#ifdef O_EXCL + SET_FLAG(EXCL,excl); +#endif + +#ifdef O_NOCTTY + SET_FLAG(NOCTTY,noctty); +#endif + +#ifdef O_APPEND + SET_FLAG(APPEND,append); +#endif + +#ifdef O_NONBLOCK + SET_FLAG(NONBLOCK,nonblock); +#endif + +#ifdef O_DSYNC + SET_FLAG(DSYNC,dsync); +#endif + +#ifdef FASYNC + SET_FLAG_FULL(FASYNC,fasync); +#endif + +#ifdef O_DIRECT + SET_FLAG(DIRECT,direct); +#endif + +#ifdef O_LARGEFILE + SET_FLAG(LARGEFILE,largefile); +#endif + +#ifdef O_DIRECTORY + SET_FLAG(DIRECTORY,directory); +#endif + +#ifdef O_NOFOLLOW + SET_FLAG(NOFOLLOW,nofollow); +#endif + +#ifdef O_NOATIME + SET_FLAG(NOATIME,noatime); +#endif + +#ifdef O_CLOEXEC + SET_FLAG(CLOEXEC,cloexec); +#endif + +#ifdef __O_SYNC + SET_FLAG_FULL(__O_SYNC,_sync); +#endif + +#ifdef O_PATH + SET_FLAG(PATH,path); +#endif + +#ifdef __O_TMPFILE + SET_FLAG_FULL(__O_TMPFILE,_tmpfile); +#endif + +} |