hostnamed: introduce systemd-hostnamed

[elogind.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index fb8df84e1934552dce76f582cedb965a4b46e46a..c2173c7222f192ae6ce5b373b3f7809cfc54539b 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -496,6 +496,64 @@ int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
         return 0;
 }
 
+int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
+        int r;
+        FILE *f;
+        char fn[PATH_MAX], line[LINE_MAX], *p;
+
+        assert(pid > 0);
+        assert(st);
+
+        assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
+        char_array_0(fn);
+
+        if (!(f = fopen(fn, "r")))
+                return -errno;
+
+        if (!(fgets(line, sizeof(line), f))) {
+                r = -errno;
+                fclose(f);
+                return r;
+        }
+
+        fclose(f);
+
+        /* Let's skip the pid and comm fields. The latter is enclosed
+         * in () but does not escape any () in its value, so let's
+         * skip over it manually */
+
+        if (!(p = strrchr(line, ')')))
+                return -EIO;
+
+        p++;
+
+        if (sscanf(p, " "
+                   "%*c "  /* state */
+                   "%*d "  /* ppid */
+                   "%*d "  /* pgrp */
+                   "%*d "  /* session */
+                   "%*d "  /* tty_nr */
+                   "%*d "  /* tpgid */
+                   "%*u "  /* flags */
+                   "%*u "  /* minflt */
+                   "%*u "  /* cminflt */
+                   "%*u "  /* majflt */
+                   "%*u "  /* cmajflt */
+                   "%*u "  /* utime */
+                   "%*u "  /* stime */
+                   "%*d "  /* cutime */
+                   "%*d "  /* cstime */
+                   "%*d "  /* priority */
+                   "%*d "  /* nice */
+                   "%*d "  /* num_threads */
+                   "%*d "  /* itrealvalue */
+                   "%llu "  /* starttime */,
+                   st) != 1)
+                return -EIO;
+
+        return 0;
+}
+
 int write_one_line_file(const char *fn, const char *line) {
         FILE *f;
         int r;
@@ -776,6 +834,29 @@ finish:
         return r;
 }
 
+int write_env_file(const char *fname, char **l) {
+
+        char **i;
+        FILE *f;
+        int r;
+
+        f = fopen(fname, "we");
+        if (!f)
+                return -errno;
+
+        STRV_FOREACH(i, l) {
+                fputs(*i, f);
+                fputc('\n', f);
+        }
+
+        fflush(f);
+
+        r = ferror(f) ? -errno : 0;
+        fclose(f);
+
+        return r;
+}
+
 char *truncate_nl(char *s) {
         assert(s);
 
@@ -4248,6 +4329,59 @@ int have_effective_cap(int value) {
         return r;
 }
 
+char* strshorten(char *s, size_t l) {
+        assert(s);
+
+        if (l < strlen(s))
+                s[l] = 0;
+
+        return s;
+}
+
+static bool hostname_valid_char(char c) {
+        return
+                (c >= 'a' && c <= 'z') ||
+                (c >= 'A' && c <= 'Z') ||
+                (c >= '0' && c <= '9') ||
+                c == '-' ||
+                c == '_' ||
+                c == '.';
+}
+
+bool hostname_is_valid(const char *s) {
+        const char *p;
+
+        if (isempty(s))
+                return false;
+
+        for (p = s; *p; p++)
+                if (!hostname_valid_char(*p))
+                        return false;
+
+        if (p-s > HOST_NAME_MAX)
+                return false;
+
+        return true;
+}
+
+char* hostname_cleanup(char *s) {
+        char *p, *d;
+
+        for (p = s, d = s; *p; p++)
+                if ((*p >= 'a' && *p <= 'z') ||
+                    (*p >= 'A' && *p <= 'Z') ||
+                    (*p >= '0' && *p <= '9') ||
+                    *p == '-' ||
+                    *p == '_' ||
+                    *p == '.')
+                        *(d++) = *p;
+
+        *d = 0;
+
+        strshorten(s, HOST_NAME_MAX);
+        return s;
+}
+
 static const char *const ioprio_class_table[] = {
         [IOPRIO_CLASS_NONE] = "none",
         [IOPRIO_CLASS_RT] = "realtime",