2011-05-25 23:01:20 -04:00
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/* See LICENSE file for copyright and license details. */
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2015-02-14 15:02:41 -05:00
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#include <sys/stat.h>
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2011-05-25 23:01:20 -04:00
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#include <dirent.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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2014-11-13 12:29:30 -05:00
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2015-02-17 12:59:01 -05:00
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#include "utf.h"
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2011-05-25 23:01:20 -04:00
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#include "util.h"
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2015-02-16 13:20:06 -05:00
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struct entry {
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char *name;
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mode_t mode, tmode;
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2011-05-25 23:01:20 -04:00
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nlink_t nlink;
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2015-02-16 13:20:06 -05:00
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uid_t uid;
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gid_t gid;
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off_t size;
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time_t t;
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2015-06-12 14:03:04 -04:00
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dev_t dev;
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ino_t ino, tino;
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2015-02-16 13:20:06 -05:00
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};
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2011-05-25 23:01:20 -04:00
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2015-06-12 14:03:04 -04:00
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static struct {
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dev_t dev;
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ino_t ino;
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2015-09-06 16:33:41 -04:00
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} tree[PATH_MAX];
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2015-06-12 14:03:04 -04:00
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2015-02-21 04:30:08 -05:00
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static int Aflag = 0;
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2014-11-13 15:24:47 -05:00
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static int aflag = 0;
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2015-01-20 11:50:37 -05:00
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static int cflag = 0;
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2014-11-13 15:24:47 -05:00
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static int dflag = 0;
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static int Fflag = 0;
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2015-03-18 14:26:42 -04:00
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static int fflag = 0;
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2014-12-07 20:33:52 -05:00
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static int Hflag = 0;
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2014-11-13 15:24:47 -05:00
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static int hflag = 0;
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static int iflag = 0;
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2014-12-07 20:33:52 -05:00
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static int Lflag = 0;
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2014-11-13 15:24:47 -05:00
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static int lflag = 0;
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2015-02-22 06:55:38 -05:00
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static int nflag = 0;
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2015-02-19 13:48:15 -05:00
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static int pflag = 0;
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2015-02-17 12:59:01 -05:00
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static int qflag = 0;
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2015-02-21 05:45:15 -05:00
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static int Rflag = 0;
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2014-11-13 15:24:47 -05:00
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static int rflag = 0;
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static int Uflag = 0;
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2015-02-18 11:29:46 -05:00
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static int uflag = 0;
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2014-11-13 15:24:47 -05:00
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static int first = 1;
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2015-06-12 14:51:51 -04:00
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static char sort = 0;
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2011-05-25 23:01:20 -04:00
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2015-06-12 13:38:07 -04:00
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static void ls(const char *, const struct entry *, int);
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2015-02-21 05:45:15 -05:00
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2013-06-14 14:20:47 -04:00
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static void
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2015-02-16 13:20:06 -05:00
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mkent(struct entry *ent, char *path, int dostat, int follow)
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2011-05-25 23:01:20 -04:00
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{
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struct stat st;
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2015-02-16 13:20:06 -05:00
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ent->name = path;
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2014-11-13 12:29:30 -05:00
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if (!dostat)
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2013-07-18 15:14:53 -04:00
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return;
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2014-12-07 20:33:52 -05:00
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if ((follow ? stat : lstat)(path, &st) < 0)
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eprintf("%s %s:", follow ? "stat" : "lstat", path);
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2015-02-16 13:20:06 -05:00
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ent->mode = st.st_mode;
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ent->nlink = st.st_nlink;
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ent->uid = st.st_uid;
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ent->gid = st.st_gid;
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ent->size = st.st_size;
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2015-02-18 11:29:46 -05:00
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if (cflag)
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ent->t = st.st_ctime;
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else if (uflag)
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ent->t = st.st_atime;
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else
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ent->t = st.st_mtime;
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2015-06-12 14:03:04 -04:00
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ent->dev = st.st_dev;
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2015-02-16 13:20:06 -05:00
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ent->ino = st.st_ino;
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2015-06-12 14:03:04 -04:00
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if (S_ISLNK(ent->mode)) {
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if (stat(path, &st) == 0) {
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ent->tmode = st.st_mode;
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ent->dev = st.st_dev;
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ent->tino = st.st_ino;
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} else {
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ent->tmode = ent->tino = 0;
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}
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}
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2011-05-25 23:01:20 -04:00
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}
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2014-06-01 08:59:47 -04:00
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static char *
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2014-02-17 09:41:09 -05:00
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indicator(mode_t mode)
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{
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2015-02-19 13:48:15 -05:00
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if (pflag || Fflag)
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if (S_ISDIR(mode))
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return "/";
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2014-02-17 09:41:09 -05:00
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2015-02-19 13:48:15 -05:00
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if (Fflag) {
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if (S_ISLNK(mode))
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return "@";
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else if (S_ISFIFO(mode))
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return "|";
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else if (S_ISSOCK(mode))
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return "=";
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else if (mode & S_IXUSR || mode & S_IXGRP || mode & S_IXOTH)
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return "*";
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}
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return "";
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2014-02-17 09:41:09 -05:00
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}
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2014-06-01 08:59:47 -04:00
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static void
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2015-02-16 13:20:06 -05:00
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output(const struct entry *ent)
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2011-05-25 23:01:20 -04:00
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{
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struct group *gr;
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struct passwd *pw;
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2015-02-16 13:20:06 -05:00
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ssize_t len;
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2015-06-12 09:09:32 -04:00
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size_t l;
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char *name, *c, *u, *fmt, buf[BUFSIZ],
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2015-02-16 13:20:06 -05:00
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pwname[_SC_LOGIN_NAME_MAX], grname[_SC_LOGIN_NAME_MAX],
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mode[] = "----------";
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2015-06-12 09:09:32 -04:00
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Rune r;
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if (qflag) {
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name = emalloc(strlen(ent->name) + 1);
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2015-08-31 12:02:10 -04:00
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2015-06-12 09:09:32 -04:00
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for (c = name, u = ent->name; *u; u += l) {
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l = chartorune(&r, u);
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if (isprintrune(r)) {
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memcpy(c, u, l);
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c += l;
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} else {
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*c++ = '?';
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}
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}
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*c = '\0';
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} else {
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name = ent->name;
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}
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2011-05-25 23:01:20 -04:00
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2013-09-27 10:32:50 -04:00
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if (iflag)
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printf("%lu ", (unsigned long)ent->ino);
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2014-11-13 12:29:30 -05:00
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if (!lflag) {
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2015-06-12 09:09:32 -04:00
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printf("%s%s\n", name, indicator(ent->mode));
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goto cleanup;
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2011-05-25 23:01:20 -04:00
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}
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2014-11-13 12:29:30 -05:00
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if (S_ISREG(ent->mode))
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2011-05-25 23:01:20 -04:00
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mode[0] = '-';
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2014-11-13 12:29:30 -05:00
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else if (S_ISBLK(ent->mode))
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2011-05-25 23:01:20 -04:00
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mode[0] = 'b';
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2014-11-13 12:29:30 -05:00
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else if (S_ISCHR(ent->mode))
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2011-05-25 23:01:20 -04:00
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mode[0] = 'c';
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2014-11-13 12:29:30 -05:00
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else if (S_ISDIR(ent->mode))
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2011-05-25 23:01:20 -04:00
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mode[0] = 'd';
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2014-11-13 12:29:30 -05:00
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else if (S_ISFIFO(ent->mode))
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2011-05-25 23:01:20 -04:00
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mode[0] = 'p';
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2014-11-13 12:29:30 -05:00
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else if (S_ISLNK(ent->mode))
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2011-05-25 23:01:20 -04:00
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mode[0] = 'l';
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2014-11-13 12:29:30 -05:00
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else if (S_ISSOCK(ent->mode))
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2011-05-25 23:01:20 -04:00
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mode[0] = 's';
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else
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mode[0] = '?';
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2014-11-13 12:29:30 -05:00
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if (ent->mode & S_IRUSR) mode[1] = 'r';
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if (ent->mode & S_IWUSR) mode[2] = 'w';
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if (ent->mode & S_IXUSR) mode[3] = 'x';
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if (ent->mode & S_IRGRP) mode[4] = 'r';
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if (ent->mode & S_IWGRP) mode[5] = 'w';
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if (ent->mode & S_IXGRP) mode[6] = 'x';
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if (ent->mode & S_IROTH) mode[7] = 'r';
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if (ent->mode & S_IWOTH) mode[8] = 'w';
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if (ent->mode & S_IXOTH) mode[9] = 'x';
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2011-05-27 18:56:43 -04:00
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2014-11-13 12:29:30 -05:00
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if (ent->mode & S_ISUID) mode[3] = (mode[3] == 'x') ? 's' : 'S';
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if (ent->mode & S_ISGID) mode[6] = (mode[6] == 'x') ? 's' : 'S';
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if (ent->mode & S_ISVTX) mode[9] = (mode[9] == 'x') ? 't' : 'T';
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2011-05-25 23:01:20 -04:00
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2015-02-22 06:55:38 -05:00
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if (!nflag && (pw = getpwuid(ent->uid)))
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2015-09-06 16:35:14 -04:00
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snprintf(pwname, sizeof(pwname), "%s", pw->pw_name);
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2014-12-21 16:58:09 -05:00
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else
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2015-09-06 16:35:14 -04:00
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snprintf(pwname, sizeof(pwname), "%d", ent->uid);
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2011-05-25 23:01:20 -04:00
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2015-02-22 06:55:38 -05:00
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if (!nflag && (gr = getgrgid(ent->gid)))
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2015-09-06 16:35:14 -04:00
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snprintf(grname, sizeof(grname), "%s", gr->gr_name);
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2014-12-21 16:58:09 -05:00
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else
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2015-09-06 16:35:14 -04:00
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snprintf(grname, sizeof(grname), "%d", ent->gid);
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2011-05-25 23:01:20 -04:00
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2015-02-16 13:20:06 -05:00
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if (time(NULL) > ent->t + (180 * 24 * 60 * 60)) /* 6 months ago? */
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2011-06-04 07:40:05 -04:00
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fmt = "%b %d %Y";
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2011-05-25 23:01:20 -04:00
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else
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fmt = "%b %d %H:%M";
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2015-02-16 13:20:06 -05:00
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strftime(buf, sizeof(buf), fmt, localtime(&ent->t));
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2014-10-19 05:48:04 -04:00
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printf("%s %4ld %-8.8s %-8.8s ", mode, (long)ent->nlink, pwname, grname);
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2015-02-22 06:55:38 -05:00
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2014-11-13 12:29:30 -05:00
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if (hflag)
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2015-04-24 18:27:20 -04:00
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printf("%10s ", humansize(ent->size));
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2014-10-19 05:48:04 -04:00
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else
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printf("%10lu ", (unsigned long)ent->size);
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printf("%s %s%s", buf, ent->name, indicator(ent->mode));
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2014-11-13 12:29:30 -05:00
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if (S_ISLNK(ent->mode)) {
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2015-02-16 13:20:06 -05:00
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if ((len = readlink(ent->name, buf, sizeof(buf) - 1)) < 0)
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2011-06-04 07:40:05 -04:00
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eprintf("readlink %s:", ent->name);
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buf[len] = '\0';
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2014-12-07 20:33:52 -05:00
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printf(" -> %s%s", buf, indicator(ent->tmode));
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2011-06-04 07:40:05 -04:00
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}
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putchar('\n');
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2015-06-12 09:09:32 -04:00
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cleanup:
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if (qflag)
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free(name);
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2011-05-25 23:01:20 -04:00
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}
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2015-02-16 13:20:06 -05:00
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static int
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entcmp(const void *va, const void *vb)
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{
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2015-03-18 14:26:42 -04:00
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int cmp = 0;
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2015-02-16 13:20:06 -05:00
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const struct entry *a = va, *b = vb;
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2015-06-12 14:51:51 -04:00
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switch (sort) {
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case 'S':
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2015-03-18 14:26:42 -04:00
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cmp = b->size - a->size;
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2015-06-12 14:51:51 -04:00
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break;
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case 't':
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2015-03-18 14:26:42 -04:00
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cmp = b->t - a->t;
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2015-06-12 14:51:51 -04:00
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break;
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}
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if (!cmp)
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cmp = strcmp(a->name, b->name);
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2015-03-18 14:26:42 -04:00
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2015-06-12 14:51:51 -04:00
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return rflag ? 0 - cmp : cmp;
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2015-02-16 13:20:06 -05:00
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}
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static void
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2015-06-12 13:38:07 -04:00
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lsdir(const char *path, const struct entry *dir)
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2015-02-16 13:20:06 -05:00
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{
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DIR *dp;
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2015-06-12 13:38:07 -04:00
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struct entry *ent, *ents = NULL;
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2015-02-16 13:20:06 -05:00
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struct dirent *d;
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2015-06-12 09:09:32 -04:00
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size_t i, n = 0;
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2015-06-12 13:38:07 -04:00
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char prefix[PATH_MAX];
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2015-02-16 13:20:06 -05:00
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2015-06-12 13:38:07 -04:00
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if (!(dp = opendir(dir->name)))
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eprintf("opendir %s:", dir->name);
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if (chdir(dir->name) < 0)
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eprintf("chdir %s:", dir->name);
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2015-02-16 13:20:06 -05:00
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while ((d = readdir(dp))) {
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2015-02-21 04:30:08 -05:00
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if (d->d_name[0] == '.' && !aflag && !Aflag)
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2015-02-16 13:20:06 -05:00
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continue;
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2015-02-21 04:30:08 -05:00
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else if (Aflag)
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2015-06-12 13:38:07 -04:00
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if (strcmp(d->d_name, ".") == 0 ||
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strcmp(d->d_name, "..") == 0)
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2015-02-21 04:30:08 -05:00
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continue;
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2015-06-12 13:38:07 -04:00
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ents = ereallocarray(ents, ++n, sizeof(*ents));
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mkent(&ents[n - 1], estrdup(d->d_name), Fflag || iflag ||
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2015-06-12 14:51:51 -04:00
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lflag || pflag || Rflag || sort, Lflag);
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2015-02-16 13:20:06 -05:00
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}
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2015-06-12 13:38:07 -04:00
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2015-02-16 13:20:06 -05:00
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closedir(dp);
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2015-06-12 13:38:07 -04:00
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if (!Uflag)
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2015-02-16 13:20:06 -05:00
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qsort(ents, n, sizeof(*ents), entcmp);
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2015-06-12 13:38:07 -04:00
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if (path[0] || dir->name[0] != '.')
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printf("%s:\n", dir->name);
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for (i = 0; i < n; i++)
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2015-06-12 14:51:51 -04:00
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output(&ents[i]);
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2015-06-12 13:38:07 -04:00
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|
|
|
|
|
|
if (Rflag) {
|
|
|
|
if (snprintf(prefix, PATH_MAX, "%s%s/", path, dir->name) >=
|
|
|
|
PATH_MAX)
|
|
|
|
eprintf("path too long: %s%s\n", path, dir->name);
|
|
|
|
|
2015-02-16 13:20:06 -05:00
|
|
|
for (i = 0; i < n; i++) {
|
2015-06-12 14:51:51 -04:00
|
|
|
ent = &ents[i];
|
2015-06-12 13:38:07 -04:00
|
|
|
if (strcmp(ent->name, ".") == 0 ||
|
|
|
|
strcmp(ent->name, "..") == 0)
|
|
|
|
continue;
|
|
|
|
if (S_ISLNK(ent->mode) && S_ISDIR(ent->tmode) && !Lflag)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
ls(prefix, ent, Rflag);
|
2015-02-16 13:20:06 -05:00
|
|
|
}
|
|
|
|
}
|
2015-06-12 13:38:07 -04:00
|
|
|
|
|
|
|
for (i = 0; i < n; ++i)
|
|
|
|
free(ents[i].name);
|
2015-02-16 13:20:06 -05:00
|
|
|
free(ents);
|
|
|
|
}
|
|
|
|
|
2015-06-12 14:03:04 -04:00
|
|
|
static int
|
|
|
|
visit(const struct entry *ent)
|
|
|
|
{
|
|
|
|
dev_t dev;
|
|
|
|
ino_t ino;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
dev = ent->dev;
|
|
|
|
ino = S_ISLNK(ent->mode) ? ent->tino : ent->ino;
|
|
|
|
|
|
|
|
for (i = 0; tree[i].ino && i < PATH_MAX; ++i) {
|
|
|
|
if (ino == tree[i].ino && dev == tree[i].dev)
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
tree[i].ino = ino;
|
|
|
|
tree[i].dev = dev;
|
2015-09-06 16:33:41 -04:00
|
|
|
|
2015-06-12 14:03:04 -04:00
|
|
|
return i;
|
|
|
|
}
|
|
|
|
|
2015-02-16 13:20:06 -05:00
|
|
|
static void
|
2015-06-12 13:38:07 -04:00
|
|
|
ls(const char *path, const struct entry *ent, int listdir)
|
2015-02-16 13:20:06 -05:00
|
|
|
{
|
2015-06-12 14:03:04 -04:00
|
|
|
int treeind;
|
2015-06-12 13:38:07 -04:00
|
|
|
char cwd[PATH_MAX];
|
|
|
|
|
|
|
|
if (!listdir) {
|
2015-02-16 13:20:06 -05:00
|
|
|
output(ent);
|
2015-06-12 13:38:07 -04:00
|
|
|
} else if (S_ISDIR(ent->mode) ||
|
|
|
|
(S_ISLNK(ent->mode) && S_ISDIR(ent->tmode))) {
|
2015-06-12 14:03:04 -04:00
|
|
|
if ((treeind = visit(ent)) < 0) {
|
|
|
|
fprintf(stderr, "%s%s: already visited\n",
|
|
|
|
path, ent->name);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2015-06-12 13:38:07 -04:00
|
|
|
if (!getcwd(cwd, PATH_MAX))
|
|
|
|
eprintf("getcwd:");
|
|
|
|
|
|
|
|
if (first)
|
|
|
|
first = !first;
|
|
|
|
else
|
|
|
|
putchar('\n');
|
|
|
|
|
|
|
|
printf("%s", path);
|
|
|
|
lsdir(path, ent);
|
2015-06-12 14:03:04 -04:00
|
|
|
tree[treeind].ino = 0;
|
2015-06-12 13:38:07 -04:00
|
|
|
|
|
|
|
if (chdir(cwd) < 0)
|
|
|
|
eprintf("chdir %s:", cwd);
|
|
|
|
}
|
2015-02-16 13:20:06 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
usage(void)
|
|
|
|
{
|
2015-02-21 05:45:15 -05:00
|
|
|
eprintf("usage: %s [-1AacdFHhiLlqRrtUu] [file ...]\n", argv0);
|
2015-02-16 13:20:06 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
main(int argc, char *argv[])
|
|
|
|
{
|
2015-06-12 10:22:46 -04:00
|
|
|
struct entry *ent, **dents, **fents;
|
|
|
|
size_t i, ds, fs;
|
2015-02-16 13:20:06 -05:00
|
|
|
|
|
|
|
ARGBEGIN {
|
|
|
|
case '1':
|
|
|
|
/* ignore */
|
|
|
|
break;
|
2015-02-21 04:30:08 -05:00
|
|
|
case 'A':
|
|
|
|
Aflag = 1;
|
|
|
|
break;
|
2015-02-16 13:20:06 -05:00
|
|
|
case 'a':
|
|
|
|
aflag = 1;
|
|
|
|
break;
|
|
|
|
case 'c':
|
|
|
|
cflag = 1;
|
2015-02-18 11:29:46 -05:00
|
|
|
uflag = 0;
|
2015-02-16 13:20:06 -05:00
|
|
|
break;
|
|
|
|
case 'd':
|
|
|
|
dflag = 1;
|
|
|
|
break;
|
2015-03-18 14:26:42 -04:00
|
|
|
case 'f':
|
|
|
|
aflag = 1;
|
|
|
|
fflag = 1;
|
|
|
|
Uflag = 1;
|
|
|
|
break;
|
2015-02-16 13:20:06 -05:00
|
|
|
case 'F':
|
|
|
|
Fflag = 1;
|
|
|
|
break;
|
|
|
|
case 'H':
|
|
|
|
Hflag = 1;
|
|
|
|
break;
|
|
|
|
case 'h':
|
|
|
|
hflag = 1;
|
|
|
|
break;
|
|
|
|
case 'i':
|
|
|
|
iflag = 1;
|
|
|
|
break;
|
|
|
|
case 'L':
|
|
|
|
Lflag = 1;
|
|
|
|
break;
|
|
|
|
case 'l':
|
|
|
|
lflag = 1;
|
|
|
|
break;
|
2015-02-22 06:55:38 -05:00
|
|
|
case 'n':
|
|
|
|
lflag = 1;
|
|
|
|
nflag = 1;
|
|
|
|
break;
|
2015-02-19 13:48:15 -05:00
|
|
|
case 'p':
|
|
|
|
pflag = 1;
|
|
|
|
break;
|
2015-02-17 12:59:01 -05:00
|
|
|
case 'q':
|
|
|
|
qflag = 1;
|
|
|
|
break;
|
2015-02-21 05:45:15 -05:00
|
|
|
case 'R':
|
|
|
|
Rflag = 1;
|
|
|
|
break;
|
2015-02-16 13:20:06 -05:00
|
|
|
case 'r':
|
2015-06-12 14:51:51 -04:00
|
|
|
rflag = 1;
|
2015-03-18 14:26:42 -04:00
|
|
|
break;
|
|
|
|
case 'S':
|
2015-06-12 14:51:51 -04:00
|
|
|
sort = 'S';
|
2015-02-16 13:20:06 -05:00
|
|
|
break;
|
|
|
|
case 't':
|
2015-06-12 14:51:51 -04:00
|
|
|
sort = 't';
|
2015-02-16 13:20:06 -05:00
|
|
|
break;
|
|
|
|
case 'U':
|
|
|
|
Uflag = 1;
|
|
|
|
break;
|
2015-02-18 11:29:46 -05:00
|
|
|
case 'u':
|
|
|
|
uflag = 1;
|
|
|
|
cflag = 0;
|
|
|
|
break;
|
2015-02-16 13:20:06 -05:00
|
|
|
default:
|
|
|
|
usage();
|
|
|
|
} ARGEND;
|
|
|
|
|
2015-06-12 10:22:46 -04:00
|
|
|
switch (argc) {
|
|
|
|
case 0: /* fallthrough */
|
|
|
|
*--argv = ".", ++argc;
|
2015-08-31 12:02:10 -04:00
|
|
|
case 1:
|
2015-06-12 10:22:46 -04:00
|
|
|
ent = emalloc(sizeof(*ent));
|
|
|
|
mkent(ent, argv[0], 1, Hflag || Lflag);
|
2015-06-12 13:38:07 -04:00
|
|
|
ls("", ent, (!dflag && S_ISDIR(ent->mode)) ||
|
|
|
|
((S_ISLNK(ent->mode) && S_ISDIR(ent->tmode)) &&
|
|
|
|
((Hflag || Lflag) || !(dflag || Fflag || lflag))));
|
|
|
|
|
2015-06-12 10:22:46 -04:00
|
|
|
break;
|
|
|
|
default:
|
|
|
|
for (i = ds = fs = 0, fents = dents = NULL; i < argc; ++i) {
|
|
|
|
ent = emalloc(sizeof(*ent));
|
|
|
|
mkent(ent, argv[i], 1, Hflag || Lflag);
|
|
|
|
|
|
|
|
if ((!dflag && S_ISDIR(ent->mode)) ||
|
|
|
|
((S_ISLNK(ent->mode) && S_ISDIR(ent->tmode)) &&
|
|
|
|
((Hflag || Lflag) || !(dflag || Fflag || lflag)))) {
|
|
|
|
dents = ereallocarray(dents, ++ds, sizeof(ent));
|
|
|
|
dents[ds - 1] = ent;
|
|
|
|
} else {
|
|
|
|
fents = ereallocarray(fents, ++fs, sizeof(ent));
|
|
|
|
fents[fs - 1] = ent;
|
|
|
|
}
|
|
|
|
}
|
2015-08-31 12:02:10 -04:00
|
|
|
|
2015-06-12 10:22:46 -04:00
|
|
|
qsort(fents, fs, sizeof(ent), entcmp);
|
|
|
|
qsort(dents, ds, sizeof(ent), entcmp);
|
2015-02-16 13:20:06 -05:00
|
|
|
|
2015-06-12 10:22:46 -04:00
|
|
|
for (i = 0; i < fs; ++i)
|
2015-06-12 14:51:51 -04:00
|
|
|
ls("", fents[i], 0);
|
2015-06-12 10:22:46 -04:00
|
|
|
if (fs && ds)
|
|
|
|
putchar('\n');
|
|
|
|
for (i = 0; i < ds; ++i)
|
2015-06-12 14:51:51 -04:00
|
|
|
ls("", dents[i], 1);
|
2015-06-12 10:22:46 -04:00
|
|
|
}
|
2015-02-16 13:20:06 -05:00
|
|
|
|
Add *fshut() functions to properly flush file streams
This has been a known issue for a long time. Example:
printf "word" > /dev/full
wouldn't report there's not enough space on the device.
This is due to the fact that every libc has internal buffers
for stdout which store fragments of written data until they reach
a certain size or on some callback to flush them all at once to the
kernel.
You can force the libc to flush them with fflush(). In case flushing
fails, you can check the return value of fflush() and report an error.
However, previously, sbase didn't have such checks and without fflush(),
the libc silently flushes the buffers on exit without checking the errors.
No offense, but there's no way for the libc to report errors in the exit-
condition.
GNU coreutils solve this by having onexit-callbacks to handle the flushing
and report issues, but they have obvious deficiencies.
After long discussions on IRC, we came to the conclusion that checking the
return value of every io-function would be a bit too much, and having a
general-purpose fclose-wrapper would be the best way to go.
It turned out that fclose() alone is not enough to detect errors. The right
way to do it is to fflush() + check ferror on the fp and then to a fclose().
This is what fshut does and that's how it's done before each return.
The return value is obviously affected, reporting an error in case a flush
or close failed, but also when reading failed for some reason, the error-
state is caught.
the !!( ... + ...) construction is used to call all functions inside the
brackets and not "terminating" on the first.
We want errors to be reported, but there's no reason to stop flushing buffers
when one other file buffer has issues.
Obviously, functionales come before the flush and ret-logic comes after to
prevent early exits as well without reporting warnings if there are any.
One more advantage of fshut() is that it is even able to report errors
on obscure NFS-setups which the other coreutils are unable to detect,
because they only check the return-value of fflush() and fclose(),
not ferror() as well.
2015-04-04 15:25:17 -04:00
|
|
|
return fshut(stdout, "<stdout>");
|
2015-02-16 13:20:06 -05:00
|
|
|
}
|