systemctl: delete REBOOT_PARAM_FILE if no parameter is specified

[elogind.git] / src / shared / util.c

diff --git a/src/shared/util.c b/src/shared/util.c
index ffe6624f9a7076142cd0f3ec8290ed7d8b1141af..b6285abb29fc3a9198bbe097fbf73c767161fa76 100644 (file)
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -83,7 +83,6 @@
 #include "gunicode.h"
 #include "virt.h"
 #include "def.h"
-#include "missing.h"
 
 int saved_argc = 0;
 char **saved_argv = NULL;
@@ -166,19 +165,19 @@ int close_nointr(int fd) {
 
         assert(fd >= 0);
         r = close(fd);
-
-        /* Just ignore EINTR; a retry loop is the wrong
-         * thing to do on Linux.
-         *
-         * http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html
-         * https://bugzilla.gnome.org/show_bug.cgi?id=682819
-         * http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR
-         * https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain
-         */
-        if (_unlikely_(r < 0 && errno == EINTR))
-                return 0;
-        else if (r >= 0)
+        if (r >= 0)
                 return r;
+        else if (errno == EINTR)
+                /*
+                 * Just ignore EINTR; a retry loop is the wrong
+                 * thing to do on Linux.
+                 *
+                 * http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html
+                 * https://bugzilla.gnome.org/show_bug.cgi?id=682819
+                 * http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR
+                 * https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain
+                 */
+                return 0;
         else
                 return -errno;
 }
@@ -195,7 +194,13 @@ int safe_close(int fd) {
 
         if (fd >= 0) {
                 PROTECT_ERRNO;
-                assert_se(close_nointr(fd) == 0);
+
+                /* The kernel might return pretty much any error code
+                 * via close(), but the fd will be closed anyway. The
+                 * only condition we want to check for here is whether
+                 * the fd was invalid at all... */
+
+                assert_se(close_nointr(fd) != -EBADF);
         }
 
         return -1;
@@ -5819,8 +5824,8 @@ char *strrep(const char *s, unsigned n) {
         return r;
 }
 
-void* greedy_realloc(void **p, size_t *allocated, size_t need) {
-        size_t a;
+void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) {
+        size_t a, newalloc;
         void *q;
 
         assert(p);
@@ -5829,10 +5834,11 @@ void* greedy_realloc(void **p, size_t *allocated, size_t need) {
         if (*allocated >= need)
                 return *p;
 
-        a = MAX(64u, need * 2);
+        newalloc = MAX(need * 2, 64u / size);
+        a = newalloc * size;
 
         /* check for overflows */
-        if (a < need)
+        if (a < size * need)
                 return NULL;
 
         q = realloc(*p, a);
@@ -5840,11 +5846,11 @@ void* greedy_realloc(void **p, size_t *allocated, size_t need) {
                 return NULL;
 
         *p = q;
-        *allocated = a;
+        *allocated = newalloc;
         return q;
 }
 
-void* greedy_realloc0(void **p, size_t *allocated, size_t need) {
+void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) {
         size_t prev;
         uint8_t *q;
 
@@ -5853,12 +5859,12 @@ void* greedy_realloc0(void **p, size_t *allocated, size_t need) {
 
         prev = *allocated;
 
-        q = greedy_realloc(p, allocated, need);
+        q = greedy_realloc(p, allocated, need, size);
         if (!q)
                 return NULL;
 
         if (*allocated > prev)
-                memzero(&q[prev], *allocated - prev);
+                memzero(q + prev * size, (*allocated - prev) * size);
 
         return q;
 }
@@ -6391,3 +6397,19 @@ void hexdump(FILE *f, const void *p, size_t s) {
                 s -= 16;
         }
 }
+
+int update_reboot_param_file(const char *param)
+{
+        int r = 0;
+
+        if (param) {
+
+                r = write_string_file(REBOOT_PARAM_FILE, param);
+                if (r < 0)
+                        log_error("Failed to write reboot param to "
+                                  REBOOT_PARAM_FILE": %s", strerror(-r));
+        } else
+                unlink(REBOOT_PARAM_FILE);
+
+        return r;
+}