}
}
- if (buf)
- buf[l] = 0;
- else if (!(buf = calloc(1, 1))) {
- r = -errno;
- goto finish;
- }
-
+ buf[l] = 0;
*contents = buf;
buf = NULL;
return n;
}
-int path_is_mount_point(const char *t) {
+int path_is_mount_point(const char *t, bool allow_symlink) {
struct stat a, b;
char *parent;
int r;
- if (lstat(t, &a) < 0) {
+ if (allow_symlink)
+ r = stat(t, &a);
+ else
+ r = lstat(t, &a);
+
+ if (r < 0) {
if (errno == ENOENT)
return 0;
return -errno;
}
- if ((r = parent_of_path(t, &parent)) < 0)
+ r = parent_of_path(t, &parent);
+ if (r < 0)
return r;
r = lstat(parent, &b);
return 0;
}
-static int rm_rf_children(int fd, bool only_dirs) {
+static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) {
DIR *d;
int ret = 0;
for (;;) {
struct dirent buf, *de;
- bool is_dir;
+ bool is_dir, keep_around = false;
int r;
if ((r = readdir_r(d, &buf, &de)) != 0) {
continue;
}
+ if (honour_sticky)
+ keep_around = st.st_uid == 0 && (st.st_mode & S_ISVTX);
+
is_dir = S_ISDIR(st.st_mode);
- } else
+
+ } else {
+ if (honour_sticky) {
+ struct stat st;
+
+ if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
+ if (ret == 0 && errno != ENOENT)
+ ret = -errno;
+ continue;
+ }
+
+ keep_around = st.st_uid == 0 && (st.st_mode & S_ISVTX);
+ }
+
is_dir = de->d_type == DT_DIR;
+ }
if (is_dir) {
int subdir_fd;
continue;
}
- if ((r = rm_rf_children(subdir_fd, only_dirs)) < 0) {
+ if ((r = rm_rf_children(subdir_fd, only_dirs, honour_sticky)) < 0) {
if (ret == 0)
ret = r;
}
- if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
- if (ret == 0 && errno != ENOENT)
- ret = -errno;
- }
- } else if (!only_dirs) {
+ if (!keep_around)
+ if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
+ if (ret == 0 && errno != ENOENT)
+ ret = -errno;
+ }
+
+ } else if (!only_dirs && !keep_around) {
if (unlinkat(fd, de->d_name, 0) < 0) {
if (ret == 0 && errno != ENOENT)
return ret;
}
-int rm_rf(const char *path, bool only_dirs, bool delete_root) {
+int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
int fd;
int r;
return 0;
}
- r = rm_rf_children(fd, only_dirs);
+ r = rm_rf_children(fd, only_dirs, honour_sticky);
+
+ if (delete_root) {
+
+ if (honour_sticky && file_is_sticky(path) > 0)
+ return r;
- if (delete_root)
- if (rmdir(path) < 0) {
+ if (rmdir(path) < 0 && errno != ENOENT) {
if (r == 0)
r = -errno;
}
+ }
return r;
}
return term;
}
-/* Returns a short identifier for the various VM implementations */
-int detect_vm(const char **id) {
-
-#if defined(__i386__) || defined(__x86_64__)
-
- /* Both CPUID and DMI are x86 specific interfaces... */
-
- static const char *const dmi_vendors[] = {
- "/sys/class/dmi/id/sys_vendor",
- "/sys/class/dmi/id/board_vendor",
- "/sys/class/dmi/id/bios_vendor"
- };
-
- static const char dmi_vendor_table[] =
- "QEMU\0" "qemu\0"
- /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
- "VMware\0" "vmware\0"
- "VMW\0" "vmware\0"
- "Microsoft Corporation\0" "microsoft\0"
- "innotek GmbH\0" "oracle\0"
- "Xen\0" "xen\0"
- "Bochs\0" "bochs\0";
-
- static const char cpuid_vendor_table[] =
- "XenVMMXenVMM\0" "xen\0"
- "KVMKVMKVM\0" "kvm\0"
- /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
- "VMwareVMware\0" "vmware\0"
- /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
- "Microsoft Hv\0" "microsoft\0";
-
- uint32_t eax, ecx;
- union {
- uint32_t sig32[3];
- char text[13];
- } sig;
- unsigned i;
- const char *j, *k;
- bool hypervisor;
-
- /* http://lwn.net/Articles/301888/ */
- zero(sig);
-
-#if defined (__i386__)
-#define REG_a "eax"
-#define REG_b "ebx"
-#elif defined (__amd64__)
-#define REG_a "rax"
-#define REG_b "rbx"
-#endif
-
- /* First detect whether there is a hypervisor */
- eax = 1;
- __asm__ __volatile__ (
- /* ebx/rbx is being used for PIC! */
- " push %%"REG_b" \n\t"
- " cpuid \n\t"
- " pop %%"REG_b" \n\t"
-
- : "=a" (eax), "=c" (ecx)
- : "0" (eax)
- );
-
- hypervisor = !!(ecx & 0x80000000U);
-
- if (hypervisor) {
-
- /* There is a hypervisor, see what it is */
- eax = 0x40000000U;
- __asm__ __volatile__ (
- /* ebx/rbx is being used for PIC! */
- " push %%"REG_b" \n\t"
- " cpuid \n\t"
- " mov %%ebx, %1 \n\t"
- " pop %%"REG_b" \n\t"
-
- : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
- : "0" (eax)
- );
-
- NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
- if (streq(sig.text, j)) {
-
- if (id)
- *id = k;
-
- return 1;
- }
- }
-
- for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
- char *s;
- int r;
- const char *found = NULL;
-
- if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
- if (r != -ENOENT)
- return r;
-
- continue;
- }
-
- NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
- if (startswith(s, j))
- found = k;
- free(s);
-
- if (found) {
- if (id)
- *id = found;
-
- return 1;
- }
- }
-
- if (hypervisor) {
- if (id)
- *id = "other";
-
- return 1;
- }
-
-#endif
- return 0;
-}
-
-int detect_container(const char **id) {
- FILE *f;
-
- /* Unfortunately many of these operations require root access
- * in one way or another */
-
- if (geteuid() != 0)
- return -EPERM;
-
- if (running_in_chroot() > 0) {
-
- if (id)
- *id = "chroot";
-
- return 1;
- }
-
- /* /proc/vz exists in container and outside of the container,
- * /proc/bc only outside of the container. */
- if (access("/proc/vz", F_OK) >= 0 &&
- access("/proc/bc", F_OK) < 0) {
-
- if (id)
- *id = "openvz";
-
- return 1;
- }
-
- if ((f = fopen("/proc/self/cgroup", "re"))) {
-
- for (;;) {
- char line[LINE_MAX], *p;
-
- if (!fgets(line, sizeof(line), f))
- break;
-
- if (!(p = strchr(strstrip(line), ':')))
- continue;
-
- if (strncmp(p, ":ns:", 4))
- continue;
-
- if (!streq(p, ":ns:/")) {
- fclose(f);
-
- if (id)
- *id = "pidns";
-
- return 1;
- }
- }
-
- fclose(f);
- }
-
- return 0;
-}
-
-/* Returns a short identifier for the various VM/container implementations */
-int detect_virtualization(const char **id) {
- static __thread const char *cached_id = NULL;
- const char *_id;
- int r;
-
- if (_likely_(cached_id)) {
-
- if (cached_id == (const char*) -1)
- return 0;
-
- if (id)
- *id = cached_id;
-
- return 1;
- }
-
- if ((r = detect_container(&_id)) != 0)
- goto finish;
-
- r = detect_vm(&_id);
-
-finish:
- if (r > 0) {
- cached_id = _id;
-
- if (id)
- *id = _id;
- } else if (r == 0)
- cached_id = (const char*) -1;
-
- return r;
-}
-
bool dirent_is_file(struct dirent *de) {
assert(de);
* number */
d = opendir(path);
+ if (!d)
+ return -errno;
+
for (;;) {
struct dirent buffer, *de;
int k;
p = stpcpy(p, t);
}
+
+ va_end(ap);
} else
r[0] = 0;
return cached > 0;
}
+int block_get_whole_disk(dev_t d, dev_t *ret) {
+ char *p, *s;
+ int r;
+ unsigned n, m;
+
+ assert(ret);
+
+ /* If it has a queue this is good enough for us */
+ if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
+ return -ENOMEM;
+
+ r = access(p, F_OK);
+ free(p);
+
+ if (r >= 0) {
+ *ret = d;
+ return 0;
+ }
+
+ /* If it is a partition find the originating device */
+ if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
+ return -ENOMEM;
+
+ r = access(p, F_OK);
+ free(p);
+
+ if (r < 0)
+ return -ENOENT;
+
+ /* Get parent dev_t */
+ if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
+ return -ENOMEM;
+
+ r = read_one_line_file(p, &s);
+ free(p);
+
+ if (r < 0)
+ return r;
+
+ r = sscanf(s, "%u:%u", &m, &n);
+ free(s);
+
+ if (r != 2)
+ return -EINVAL;
+
+ /* Only return this if it is really good enough for us. */
+ if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
+ return -ENOMEM;
+
+ r = access(p, F_OK);
+ free(p);
+
+ if (r >= 0) {
+ *ret = makedev(m, n);
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
+int file_is_sticky(const char *p) {
+ struct stat st;
+
+ assert(p);
+
+ if (lstat(p, &st) < 0)
+ return -errno;
+
+ return
+ st.st_uid == 0 &&
+ (st.st_mode & S_ISVTX);
+}
+
static const char *const ioprio_class_table[] = {
[IOPRIO_CLASS_NONE] = "none",
[IOPRIO_CLASS_RT] = "realtime",
DEFINE_STRING_TABLE_LOOKUP(ip_tos, int);
-static const char *const signal_table[] = {
+static const char *const __signal_table[] = {
[SIGHUP] = "HUP",
[SIGINT] = "INT",
[SIGQUIT] = "QUIT",
[SIGSYS] = "SYS"
};
-DEFINE_STRING_TABLE_LOOKUP(signal, int);
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
+
+const char *signal_to_string(int signo) {
+ static __thread char buf[12];
+ const char *name;
+
+ name = __signal_to_string(signo);
+ if (name)
+ return name;
+
+ if (signo >= SIGRTMIN && signo <= SIGRTMAX)
+ snprintf(buf, sizeof(buf) - 1, "RTMIN+%d", signo - SIGRTMIN);
+ else
+ snprintf(buf, sizeof(buf) - 1, "%d", signo);
+ char_array_0(buf);
+ return buf;
+}
+
+int signal_from_string(const char *s) {
+ int signo;
+ int offset = 0;
+ unsigned u;
+
+ signo =__signal_from_string(s);
+ if (signo > 0)
+ return signo;
+
+ if (startswith(s, "RTMIN+")) {
+ s += 6;
+ offset = SIGRTMIN;
+ }
+ if (safe_atou(s, &u) >= 0) {
+ signo = (int) u + offset;
+ if (signo > 0 && signo < _NSIG)
+ return signo;
+ }
+ return -1;
+}
+
+bool kexec_loaded(void) {
+ bool loaded = false;
+ char *s;
+
+ if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
+ if (s[0] == '1')
+ loaded = true;
+ free(s);
+ }
+ return loaded;
+}
+
+int strdup_or_null(const char *a, char **b) {
+ char *c;
+
+ assert(b);
+
+ if (!a) {
+ *b = NULL;
+ return 0;
+ }
+
+ c = strdup(a);
+ if (!c)
+ return -ENOMEM;
+
+ *b = c;
+ return 0;
+}
~ianmdlvl / elogind.git / blobdiff