--- /dev/null
+/*
+ * pipesz(1) - Set or examine pipe buffer sizes.
+ *
+ * Copyright (c) 2022 Nathan Sharp
+ * Written by Nathan Sharp <nwsharp@live.com>
+ *
+ * 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.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <getopt.h>
+#include <sys/ioctl.h> /* FIONREAD */
+#include <fcntl.h> /* F_GETPIPE_SZ F_SETPIPE_SZ */
+
+#include "c.h"
+#include "nls.h"
+
+#include "closestream.h" /* close_stdout_atexit */
+#include "optutils.h" /* err_exclusive_options */
+#include "path.h" /* ul_path_read_s32 */
+#include "pathnames.h" /* _PATH_PROC_PIPE_MAX_SIZE */
+#include "strutils.h" /* strtos32_or_err strtosize_or_err */
+
+static char opt_check = 0; /* --check */
+static char opt_get = 0; /* --get */
+static char opt_quiet = 0; /* --quiet */
+static int opt_size = -1; /* --set <size> */
+static char opt_verbose = 0; /* --verbose */
+
+/* fallback file for default size */
+#ifndef PIPESZ_DEFAULT_SIZE_FILE
+#define PIPESZ_DEFAULT_SIZE_FILE _PATH_PROC_PIPE_MAX_SIZE
+#endif
+
+/* convenience macros, since pipesz is by default very lenient */
+#define check(FMT...) do { \
+ if (opt_check) { \
+ err(EXIT_FAILURE, FMT); \
+ } else if (!opt_quiet) { \
+ warn(FMT); \
+ } \
+} while (0)
+
+#define checkx(FMT...) do { \
+ if (opt_check) { \
+ errx(EXIT_FAILURE, FMT); \
+ } else if (!opt_quiet) { \
+ warnx(FMT); \
+ } \
+} while (0)
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ fputs(USAGE_HEADER, stdout);
+ printf(_(" %s [options] [--set <size>] [--] [command]\n"), program_invocation_short_name);
+ printf(_(" %s [options] --get\n"), program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, stdout);
+ /* TRANSLATORS: 'command' refers to a program argument */
+ puts(_("Set or examine pipe buffer sizes and optionally execute command."));
+
+ fputs(USAGE_OPTIONS, stdout);
+ puts(_(" -g, --get examine pipe buffers"));
+ /* TRANSLATORS: '%s' refers to a system file */
+ printf(_(" -s, --set <size> set pipe buffer sizes\n"
+ " size defaults to %s\n"
+ ), PIPESZ_DEFAULT_SIZE_FILE);
+
+ fputs(USAGE_SEPARATOR, stdout);
+ puts(_(" -f, --file <path> act on a file"));
+ puts(_(" -n, --fd <num> act on a file descriptor"));
+ puts(_(" -i, --stdin act on standard input"));
+ puts(_(" -o, --stdout act on standard output"));
+ puts(_(" -e, --stderr act on standard error"));
+
+ fputs(USAGE_SEPARATOR, stdout);
+ puts(_(" -c, --check do not continue after an error"));
+ puts(_(" -q, --quiet do not warn of non-fatal errors"));
+ puts(_(" -v, --verbose provide detailed output"));
+
+ fputs(USAGE_SEPARATOR, stdout);
+ printf(USAGE_HELP_OPTIONS(20));
+
+ printf(USAGE_MAN_TAIL("pipesz(1)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+/*
+ * performs F_GETPIPE_SZ and FIONREAD
+ * outputs a table row
+ */
+static void do_get(int fd, const char *name)
+{
+ int sz, used;
+
+ sz = fcntl(fd, F_GETPIPE_SZ);
+ if (sz < 0) {
+ /* TRANSLATORS: '%s' refers to a file */
+ check(_("cannot get pipe buffer size of %s"), name);
+ return;
+ }
+
+ if (ioctl(fd, FIONREAD, &used))
+ used = 0;
+
+ printf("%s\t%d\t%d\n", name, sz, used);
+}
+
+/*
+ * performs F_SETPIPE_SZ
+ */
+static void do_set(int fd, const char *name)
+{
+ int sz;
+
+ sz = fcntl(fd, F_SETPIPE_SZ, opt_size);
+ if (sz < 0)
+ /* TRANSLATORS: '%s' refers to a file */
+ check(_("cannot set pipe buffer size of %s"), name);
+ else if (opt_verbose)
+ /* TRANSLATORS: '%s' refers to a file, '%d' to a buffer size in bytes */
+ warnx(_("%s pipe buffer size set to %d"), name, sz);
+}
+
+/*
+ * does the requested operation on an fd
+ */
+static void do_fd(int fd)
+{
+ char name[sizeof(stringify(INT_MIN)) + 3];
+
+ sprintf(name, "fd %d", fd);
+
+ if (opt_get)
+ do_get(fd, name);
+ else
+ do_set(fd, name);
+}
+
+/*
+ * does the requested operation on a file
+ */
+static void do_file(const char *path)
+{
+ int fd;
+
+ fd = open(path, O_RDONLY | O_CLOEXEC);
+ if (fd < 0) {
+ /* TRANSLATORS: '%s' refers to a file */
+ check(_("cannot open %s"), path);
+ return;
+ }
+
+ if (opt_get)
+ do_get(fd, path);
+ else
+ do_set(fd, path);
+
+ close(fd);
+}
+
+/*
+ * if necessary, determines a default buffer size and places it in opt_size
+ * returns FALSE if this could not be done
+ */
+static char set_size_default(void)
+{
+ if (opt_size >= 0)
+ return TRUE;
+
+ if (ul_path_read_s32(NULL, &opt_size, PIPESZ_DEFAULT_SIZE_FILE)) {
+ /* TRANSLATORS: '%s' refers to a system file */
+ check(_("cannot parse %s"), PIPESZ_DEFAULT_SIZE_FILE);
+ return FALSE;
+ }
+
+ if (opt_size < 0) {
+ /* TRANSLATORS: '%s' refers to a system file */
+ checkx(_("cannot parse %s"), PIPESZ_DEFAULT_SIZE_FILE);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+int main(int argc, char **argv)
+{
+ static const char shortopts[] = "+cef:ghin:oqs:vV";
+ static const struct option longopts[] = {
+ { "check", no_argument, NULL, 'c' },
+ { "fd", required_argument, NULL, 'n' },
+ { "file", required_argument, NULL, 'f' },
+ { "get", no_argument, NULL, 'g' },
+ { "help", no_argument, NULL, 'h' },
+ { "quiet", no_argument, NULL, 'q' },
+ { "set", required_argument, NULL, 's' },
+ { "stdin", no_argument, NULL, 'i' },
+ { "stdout", no_argument, NULL, 'o' },
+ { "stderr", no_argument, NULL, 'e' },
+ { "verbose", no_argument, NULL, 'v' },
+ { "version", no_argument, NULL, 'V' },
+ { NULL, 0, NULL, 0 }
+ };
+ static const ul_excl_t excl[] = {
+ { 'g', 's' },
+ { 0 }
+ };
+
+ int c, fd, n_opt_pipe = 0, n_opt_size = 0;
+ uintmax_t sz;
+
+ int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
+
+ /* check for --help or --version */
+ while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1)
+ switch (c) {
+ case 'h':
+ usage();
+ case 'V':
+ print_version(EXIT_SUCCESS);
+ }
+
+ /* gather normal options */
+ optind = 1;
+ while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
+ err_exclusive_options(c, longopts, excl, excl_st);
+
+ switch (c) {
+ case 'c':
+ opt_check = TRUE;
+ break;
+ case 'e':
+ ++n_opt_pipe;
+ break;
+ case 'f':
+ ++n_opt_pipe;
+ break;
+ case 'g':
+ opt_get = TRUE;
+ break;
+ case 'i':
+ ++n_opt_pipe;
+ break;
+ case 'n':
+ fd = strtos32_or_err(optarg, _("invalid fd argument"));
+ ++n_opt_pipe;
+ break;
+ case 'o':
+ ++n_opt_pipe;
+ break;
+ case 'q':
+ opt_quiet = TRUE;
+ break;
+ case 's':
+ sz = strtosize_or_err(optarg, _("invalid size argument"));
+ opt_size = sz >= INT_MAX ? INT_MAX : (int)sz;
+ break;
+ case 'v':
+ opt_verbose = TRUE;
+ break;
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ /* check arguments */
+ if (opt_get) {
+ if (argv[optind])
+ errx(EXIT_FAILURE, _("cannot specify a command with --get"));
+
+ /* print column headers, if requested */
+ if (opt_verbose)
+ printf("%s\t%s\t%s\n",
+/* TRANSLATORS: a column that contains the names of files that are unix pipes */
+ _("pipe"),
+/* TRANSLATORS: a column that contains buffer sizes in bytes */
+ _("size"),
+/* TRANSLATORS: a column that contains an amount of data which has not been used by a program */
+ _("unread")
+ );
+
+ /* special behavior for --get */
+ if (!n_opt_pipe) {
+ do_fd(STDIN_FILENO);
+ return EXIT_SUCCESS;
+ }
+ } else {
+ if (!set_size_default())
+ goto execute_command;
+
+ if (!opt_quiet && n_opt_size > 1)
+ warnx(_("using last specified size"));
+
+ /* special behavior for --set */
+ if (!n_opt_pipe) {
+ do_fd(STDOUT_FILENO);
+ goto execute_command;
+ }
+ }
+
+ /* go through the arguments again and do the requested operations */
+ optind = 1;
+ while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1)
+ switch (c) {
+ case 'e':
+ do_fd(STDERR_FILENO);
+ break;
+ case 'f':
+ do_file(optarg);
+ break;
+ case 'i':
+ do_fd(STDIN_FILENO);
+ break;
+ case 'n':
+ /* optarg was checked before, but it's best to be safe */
+ fd = strtos32_or_err(optarg, _("invalid fd argument"));
+ do_fd(fd);
+ break;
+ case 'o':
+ do_fd(STDOUT_FILENO);
+ break;
+ }
+
+execute_command:
+ /* exec the command, if it's present */
+ if (!argv[optind])
+ return EXIT_SUCCESS;
+
+ execvp(argv[optind], &argv[optind]);
+ errexec(argv[optind]);
+}
projects / thirdparty / util-linux.git / commitdiff
