ubase/pwdx.c
Mattias Andrée 5b16e8a4eb pwdx: fix off-by-one bug
Signed-off-by: Mattias Andrée <maandree@kth.se>
2016-04-20 23:08:51 +01:00

52 lines
857 B
C

/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s pid...\n", argv0);
}
int
main(int argc, char *argv[])
{
int ret = 0;
char path[PATH_MAX];
char target[PATH_MAX + sizeof(" (deleted)")];
ssize_t n;
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc == 0)
usage();
for (; argc > 0; argc--, argv++) {
n = snprintf(path, sizeof(path), "/proc/%s/cwd", *argv);
if (n < 0 || n >= sizeof(path)) {
errno = ESRCH;
} else {
n = readlink(path, target, sizeof(target) - 1);
if (n >= 0) {
target[n] = '\0';
printf("%s: %s\n", *argv, target);
continue;
}
}
if (errno == ENOENT)
errno = ESRCH;
weprintf("%s:", *argv);
ret = 1;
}
return ret;
}