150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
/*
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* pwdx.c - print process working directory
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* Copyright 2004 Nicholas Miell
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <limits.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 <sys/types.h>
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#include <unistd.h>
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#include "c.h"
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#include "nls.h"
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#include "xalloc.h"
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#include "fileutils.h"
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static void __attribute__ ((__noreturn__)) usage(FILE * out)
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{
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fputs(USAGE_HEADER, out);
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fprintf(out, _(" %s [options] pid...\n"), program_invocation_short_name);
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fputs(USAGE_OPTIONS, out);
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fputs(USAGE_HELP, out);
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fputs(USAGE_VERSION, out);
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fprintf(out, USAGE_MAN_TAIL("pwdx(1)"));
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exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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int check_pid_argument(char *input)
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{
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int skip = 0;
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long pid;
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char *end = NULL;
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if (!strncmp("/proc/", input, 6))
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skip = 6;
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errno = 0;
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pid = strtol(input + skip, &end, 10);
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if (errno || input + skip == end || (end && *end))
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return 1;
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if (pid < 1)
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return 1;
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int ch;
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int retval = 0, i;
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ssize_t alloclen = 128;
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char *pathbuf;
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static const struct option longopts[] = {
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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{NULL, 0, 0, 0}
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};
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#ifdef HAVE_PROGRAM_INVOCATION_NAME
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program_invocation_name = program_invocation_short_name;
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#endif
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setlocale (LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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atexit(close_stdout);
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while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
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switch (ch) {
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case 'V':
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printf(PROCPS_NG_VERSION);
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return EXIT_SUCCESS;
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case 'h':
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usage(stdout);
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default:
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usage(stderr);
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}
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argc -= optind;
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argv += optind;
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if (argc == 0)
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usage(stderr);
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pathbuf = xmalloc(alloclen);
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for (i = 0; i < argc; i++) {
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char *s;
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ssize_t len, buflen;
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/* Constant 10 is the length of strings "/proc/" + "/cwd" */
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char *buf;
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buflen = 10 + strlen(argv[i]) + 1;
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buf = xmalloc(buflen);
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if (check_pid_argument(argv[i]))
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xerrx(EXIT_FAILURE, _("invalid process id: %s"),
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argv[i]);
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/*
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* At this point, all arguments are in the form
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* /proc/NNNN or NNNN, so a simple check based on
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* the first char is possible
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*/
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if (argv[i][0] != '/')
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snprintf(buf, buflen, "/proc/%s/cwd", argv[i]);
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else
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snprintf(buf, buflen, "%s/cwd", argv[i]);
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/*
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* buf contains /proc/NNNN/cwd symlink name
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* on entry, the target of that symlink on return
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*/
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while ((len = readlink(buf, pathbuf, alloclen)) == alloclen) {
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alloclen *= 2;
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pathbuf = xrealloc(pathbuf, alloclen);
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}
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free(buf);
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if (len < 0) {
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s = strerror(errno == ENOENT ? ESRCH : errno);
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retval = EXIT_FAILURE;
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fprintf(stderr, "%s: %s\n", argv[i], s);
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continue;
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} else {
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pathbuf[len] = 0;
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s = pathbuf;
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}
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printf("%s: %s\n", argv[i], s);
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}
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free(pathbuf);
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return retval;
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}
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