X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Futil.c;h=5cbbe8fb7d2886ffbbe36fab7cde07aba50fbe2c;hp=a13819e79ac8acb5e21d71a9474412cee2b222a8;hb=0daa5666da6fab8864e313dd594a2648d882e0cf;hpb=a6dcc7e5924f9c27d3e9c6560a448b02ec28b65f

diff --git a/src/shared/util.c b/src/shared/util.c
index a13819e79..5cbbe8fb7 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -94,6 +94,9 @@
 #include "def.h"
 #include "sparse-endian.h"
 
+/* Put this test here for a lack of better place */
+assert_cc(EAGAIN == EWOULDBLOCK);
+
 int saved_argc = 0;
 char **saved_argv = NULL;
 
@@ -2592,7 +2595,7 @@ char* dirname_malloc(const char *path) {
 int dev_urandom(void *p, size_t n) {
         static int have_syscall = -1;
 
-        _cleanup_close_ fd = -1;
+        _cleanup_close_ int fd = -1;
         int r;
 
         /* Gathers some randomness from the kernel. This call will
@@ -2923,31 +2926,30 @@ int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
 
                 /* This is an ugly hack */
                 if (major(devnr) == 136) {
-                        asprintf(&b, "pts/%u", minor(devnr));
-                        goto finish;
-                }
+                        if (asprintf(&b, "pts/%u", minor(devnr)) < 0)
+                                return -ENOMEM;
+                } else {
+                        /* Probably something like the ptys which have no
+                         * symlink in /dev/char. Let's return something
+                         * vaguely useful. */
 
-                /* Probably something like the ptys which have no
-                 * symlink in /dev/char. Let's return something
-                 * vaguely useful. */
+                        b = strdup(fn + 5);
+                        if (!b)
+                                return -ENOMEM;
+                }
+        } else {
+                if (startswith(s, "/dev/"))
+                        p = s + 5;
+                else if (startswith(s, "../"))
+                        p = s + 3;
+                else
+                        p = s;
 
-                b = strdup(fn + 5);
-                goto finish;
+                b = strdup(p);
+                if (!b)
+                        return -ENOMEM;
         }
 
-        if (startswith(s, "/dev/"))
-                p = s + 5;
-        else if (startswith(s, "../"))
-                p = s + 3;
-        else
-                p = s;
-
-        b = strdup(p);
-
-finish:
-        if (!b)
-                return -ENOMEM;
-
         *r = b;
         if (_devnr)
                 *_devnr = devnr;
@@ -4119,8 +4121,7 @@ static int do_execute(char **directories, usec_t timeout, char *argv[]) {
                         if (null_or_empty_path(path)) {
                                 log_debug("%s is empty (a mask).", path);
                                 continue;
-                        } else
-                                log_debug("%s will be executed.", path);
+                        }
 
                         pid = fork();
                         if (pid < 0) {
@@ -6668,7 +6669,7 @@ int getpeersec(int fd, char **ret) {
 
         if (isempty(s)) {
                 free(s);
-                return -ENOTSUP;
+                return -EOPNOTSUPP;
         }
 
         *ret = s;
@@ -8122,3 +8123,44 @@ void cmsg_close_all(struct msghdr *mh) {
                 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS)
                         close_many((int*) CMSG_DATA(cmsg), (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int));
 }
+
+int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char *newpath) {
+        struct stat buf;
+        int ret;
+
+        ret = renameat2(olddirfd, oldpath, newdirfd, newpath, RENAME_NOREPLACE);
+        if (ret >= 0)
+                return 0;
+
+        /* Even though renameat2() exists since Linux 3.15, btrfs added
+         * support for it later. If it is not implemented, fallback to another
+         * method. */
+        if (errno != EINVAL)
+                return -errno;
+
+        /* The link()/unlink() fallback does not work on directories. But
+         * renameat() without RENAME_NOREPLACE gives the same semantics on
+         * directories, except when newpath is an *empty* directory. This is
+         * good enough. */
+        ret = fstatat(olddirfd, oldpath, &buf, AT_SYMLINK_NOFOLLOW);
+        if (ret >= 0 && S_ISDIR(buf.st_mode)) {
+                ret = renameat(olddirfd, oldpath, newdirfd, newpath);
+                return ret >= 0 ? 0 : -errno;
+        }
+
+        /* If it is not a directory, use the link()/unlink() fallback. */
+        ret = linkat(olddirfd, oldpath, newdirfd, newpath, 0);
+        if (ret < 0)
+                return -errno;
+
+        ret = unlinkat(olddirfd, oldpath, 0);
+        if (ret < 0) {
+                /* backup errno before the following unlinkat() alters it */
+                ret = errno;
+                (void) unlinkat(newdirfd, newpath, 0);
+                errno = ret;
+                return -errno;
+        }
+
+        return 0;
+}