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Diffstat (limited to '')
| -rw-r--r-- | src/pwdx.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/pwdx.c b/src/pwdx.c new file mode 100644 index 0000000..90ead80 --- /dev/null +++ b/src/pwdx.c @@ -0,0 +1,153 @@ +/* + * pwdx.c - print process working directory + * + * Copyright © 2015-2023 Craig Small <csmall@dropbear.xyz> + * Copyright © 2011-2012 Sami Kerola <kerolasa@iki.fi> + * Copyright © 2004-2006 Albert Cahalan + * Copyright © 2004 Nicholas Miell + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <errno.h> +#include <getopt.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <unistd.h> + +#include "c.h" +#include "nls.h" +#include "xalloc.h" +#include "fileutils.h" + +static void __attribute__ ((__noreturn__)) usage(FILE * out) +{ + fputs(USAGE_HEADER, out); + fprintf(out, _(" %s [options] pid...\n"), program_invocation_short_name); + fputs(USAGE_OPTIONS, out); + fputs(USAGE_HELP, out); + fputs(USAGE_VERSION, out); + fprintf(out, USAGE_MAN_TAIL("pwdx(1)")); + + exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); +} + +int check_pid_argument(char *input) +{ + int skip = 0; + long pid; + char *end = NULL; + + if (!strncmp("/proc/", input, 6)) + skip = 6; + errno = 0; + pid = strtol(input + skip, &end, 10); + + if (errno || input + skip == end || (end && *end)) + return 1; + if (pid < 1) + return 1; + return 0; +} + +int main(int argc, char *argv[]) +{ + int ch; + int retval = 0, i; + ssize_t alloclen = 128; + char *pathbuf; + + static const struct option longopts[] = { + {"version", no_argument, 0, 'V'}, + {"help", no_argument, 0, 'h'}, + {NULL, 0, 0, 0} + }; + +#ifdef HAVE_PROGRAM_INVOCATION_NAME + program_invocation_name = program_invocation_short_name; +#endif + setlocale (LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + atexit(close_stdout); + + while ((ch = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1) + switch (ch) { + case 'V': + printf(PROCPS_NG_VERSION); + return EXIT_SUCCESS; + case 'h': + usage(stdout); + default: + usage(stderr); + } + + argc -= optind; + argv += optind; + + if (argc == 0) + usage(stderr); + + pathbuf = xmalloc(alloclen); + + for (i = 0; i < argc; i++) { + char *s; + ssize_t len, buflen; + /* Constant 10 is the length of strings "/proc/" + "/cwd" */ + char *buf; + buflen = 10 + strlen(argv[i]) + 1; + buf = xmalloc(buflen); + + if (check_pid_argument(argv[i])) + xerrx(EXIT_FAILURE, _("invalid process id: %s"), + argv[i]); + /* + * At this point, all arguments are in the form + * /proc/NNNN or NNNN, so a simple check based on + * the first char is possible + */ + if (argv[i][0] != '/') + snprintf(buf, buflen, "/proc/%s/cwd", argv[i]); + else + snprintf(buf, buflen, "%s/cwd", argv[i]); + + /* + * buf contains /proc/NNNN/cwd symlink name + * on entry, the target of that symlink on return + */ + while ((len = readlink(buf, pathbuf, alloclen)) == alloclen) { + alloclen *= 2; + pathbuf = xrealloc(pathbuf, alloclen); + } + free(buf); + + if (len < 0) { + s = strerror(errno == ENOENT ? ESRCH : errno); + retval = EXIT_FAILURE; + fprintf(stderr, "%s: %s\n", argv[i], s); + continue; + } else { + pathbuf[len] = 0; + s = pathbuf; + } + + printf("%s: %s\n", argv[i], s); + } + free(pathbuf); + return retval; +} |