manager: expose a few special units via SIGRTMIN+x signals

[elogind.git] / src / util.c

diff --git a/src/util.c b/src/util.c
index a8ea4a97ab745dbc3ea4400176e10d9bae29f4e9..4fdc8e57c5bbe93db072ee978e9ae36eb5055685 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -43,6 +43,7 @@
 #include <sys/poll.h>
 #include <libgen.h>
 #include <ctype.h>
+#include <sys/prctl.h>
 
 #include "macro.h"
 #include "util.h"
@@ -222,6 +223,13 @@ void close_nointr_nofail(int fd) {
         errno = saved_errno;
 }
 
+void close_many(const int fds[], unsigned n_fd) {
+        unsigned i;
+
+        for (i = 0; i < n_fd; i++)
+                close_nointr_nofail(fds[i]);
+}
+
 int parse_boolean(const char *v) {
         assert(v);
 
@@ -233,6 +241,29 @@ int parse_boolean(const char *v) {
         return -EINVAL;
 }
 
+int parse_pid(const char *s, pid_t* ret_pid) {
+        unsigned long ul;
+        pid_t pid;
+        int r;
+
+        assert(s);
+        assert(ret_pid);
+
+        if ((r = safe_atolu(s, &ul)) < 0)
+                return r;
+
+        pid = (pid_t) ul;
+
+        if ((unsigned long) pid != ul)
+                return -ERANGE;
+
+        if (pid <= 0)
+                return -ERANGE;
+
+        *ret_pid = pid;
+        return 0;
+}
+
 int safe_atou(const char *s, unsigned *ret_u) {
         char *x = NULL;
         unsigned long l;
@@ -582,6 +613,26 @@ int readlink_malloc(const char *p, char **r) {
         }
 }
 
+int readlink_and_make_absolute(const char *p, char **r) {
+        char *target, *k;
+        int j;
+
+        assert(p);
+        assert(r);
+
+        if ((j = readlink_malloc(p, &target)) < 0)
+                return j;
+
+        k = file_in_same_dir(p, target);
+        free(target);
+
+        if (!k)
+                return -ENOMEM;
+
+        *r = k;
+        return 0;
+}
+
 char *file_name_from_path(const char *p) {
         char *r;
 
@@ -2092,6 +2143,80 @@ bool is_device_path(const char *path) {
                 path_startswith(path, "/sys/");
 }
 
+int dir_is_empty(const char *path) {
+        DIR *d;
+        int r;
+        struct dirent buf, *de;
+
+        if (!(d = opendir(path)))
+                return -errno;
+
+        for (;;) {
+                if ((r = readdir_r(d, &buf, &de)) > 0) {
+                        r = -r;
+                        break;
+                }
+
+                if (!de) {
+                        r = 1;
+                        break;
+                }
+
+                if (!ignore_file(de->d_name)) {
+                        r = 0;
+                        break;
+                }
+        }
+
+        closedir(d);
+        return r;
+}
+
+unsigned long long random_ull(void) {
+        int fd;
+        uint64_t ull;
+        ssize_t r;
+
+        if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0)
+                goto fallback;
+
+        r = loop_read(fd, &ull, sizeof(ull));
+        close_nointr_nofail(fd);
+
+        if (r != sizeof(ull))
+                goto fallback;
+
+        return ull;
+
+fallback:
+        return random() * RAND_MAX + random();
+}
+
+void rename_process(const char name[8]) {
+        assert(name);
+
+        prctl(PR_SET_NAME, name);
+
+        /* This is a like a poor man's setproctitle(). The string
+         * passed should fit in 7 chars (i.e. the length of
+         * "systemd") */
+
+        if (program_invocation_name)
+                strncpy(program_invocation_name, name, strlen(program_invocation_name));
+}
+
+void sigset_add_many(sigset_t *ss, ...) {
+        va_list ap;
+        int sig;
+
+        assert(ss);
+
+        va_start(ap, ss);
+        while ((sig = va_arg(ap, int)) > 0)
+                assert_se(sigaddset(ss, sig) == 0);
+        va_end(ap);
+}
+
 static const char *const ioprio_class_table[] = {
         [IOPRIO_CLASS_NONE] = "none",
         [IOPRIO_CLASS_RT] = "realtime",