96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
// Copyright 2004 Nicholas Miell
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//
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// This file may be used subject to the terms and conditions of the
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// GNU Library General Public License Version 2 as published by the
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// Free Software Foundation.This program is distributed in the hope
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// that it will be useful, but WITHOUT ANY WARRANTY; without even the
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// implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the GNU Library General Public License for more
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// details.
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <regex.h>
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#include <limits.h>
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#include <unistd.h>
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#include <errno.h>
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#include "proc/version.h"
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static void die(const char *msg) NORETURN;
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static void die(const char *msg)
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{
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fputs(msg, stderr);
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exit(1);
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}
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static void version(void) NORETURN;
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static void version(void)
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{
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printf("pwdx (%s)\n", procps_version);
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exit(0);
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}
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int main(int argc, char* argv[])
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{
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char buf[PATH_MAX+1];
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regex_t re;
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int i;
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if (argc < 2)
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die("Usage: pwdx pid...\n");
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// Allowed on the command line:
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//
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// --version
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// -V
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// /proc/nnnn
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// nnnn
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//
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// where nnnn is any number that doesn't begin with 0.
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//
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// If --version or -V are present, further arguments are ignored
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// completely.
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regcomp(&re, "^((/proc/+)?[1-9][0-9]*|-V|--version)$",
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REG_EXTENDED|REG_NOSUB);
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for (i = 1; i < argc; i++) {
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if (regexec(&re, argv[i], 0, NULL, 0) != 0) {
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snprintf(buf, sizeof buf, "pwdx: invalid process id: %s\n", argv[i]);
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die(buf);
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}
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if (!strcmp("-V", argv[i]) || !strcmp("--version", argv[i]))
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version();
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}
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regfree(&re);
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for (i = 1; i < argc; i++) {
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char * s = buf;
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int len;
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// At this point, all arguments are in the form /proc/nnnn
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// or nnnn, so a simple check based on the first char is
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// possible
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if (argv[i][0] != '/')
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snprintf(buf, sizeof buf, "/proc/%s/cwd", argv[i]);
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else
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snprintf(buf, sizeof buf, "%s/cwd", argv[i]);
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// buf contains /proc/nnnn/cwd symlink name on entry, the
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// target of that symlink on return
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if ((len = readlink(buf, buf, PATH_MAX)) < 0) {
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s = strerror(errno == ENOENT ? ESRCH : errno);
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} else {
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buf[len] = 0;
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}
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printf("%s: %s\n", argv[i], s);
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}
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return 0;
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}
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