diff options
author | Michael Biebl <biebl@debian.org> | 2018-01-28 22:49:17 +0100 |
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committer | Michael Biebl <biebl@debian.org> | 2018-01-28 22:49:17 +0100 |
commit | 1d42b86df9052528a8f56b2f52d8bc2faf87b2da (patch) | |
tree | 0d80f37a1ad6f02067261ee3e7ee62e1869fcd56 /src/basic/util.c | |
parent | 52ad194e0b816b8273dd8d0fea3e6d467f6ca34e (diff) | |
download | systemd-1d42b86df9052528a8f56b2f52d8bc2faf87b2da.tar.gz |
New upstream version 237
Diffstat (limited to 'src/basic/util.c')
-rw-r--r-- | src/basic/util.c | 329 |
1 files changed, 61 insertions, 268 deletions
diff --git a/src/basic/util.c b/src/basic/util.c index 8f9f2b902b..c7f1513f3e 100644 --- a/src/basic/util.c +++ b/src/basic/util.c @@ -52,6 +52,7 @@ #include "parse-util.h" #include "path-util.h" #include "process-util.h" +#include "procfs-util.h" #include "set.h" #include "signal-util.h" #include "stat-util.h" @@ -61,6 +62,7 @@ #include "umask-util.h" #include "user-util.h" #include "util.h" +#include "virt.h" int saved_argc = 0; char **saved_argv = NULL; @@ -118,45 +120,6 @@ int socket_from_display(const char *display, char **path) { return 0; } -int block_get_whole_disk(dev_t d, dev_t *ret) { - char p[SYS_BLOCK_PATH_MAX("/partition")]; - _cleanup_free_ char *s = NULL; - int r; - unsigned n, m; - - assert(ret); - - /* If it has a queue this is good enough for us */ - xsprintf_sys_block_path(p, "/queue", d); - if (access(p, F_OK) >= 0) { - *ret = d; - return 0; - } - - /* If it is a partition find the originating device */ - xsprintf_sys_block_path(p, "/partition", d); - if (access(p, F_OK) < 0) - return -ENOENT; - - /* Get parent dev_t */ - xsprintf_sys_block_path(p, "/../dev", d); - r = read_one_line_file(p, &s); - if (r < 0) - return r; - - r = sscanf(s, "%u:%u", &m, &n); - if (r != 2) - return -EINVAL; - - /* Only return this if it is really good enough for us. */ - xsprintf_sys_block_path(p, "/queue", makedev(m, n)); - if (access(p, F_OK) < 0) - return -ENOENT; - - *ret = makedev(m, n); - return 0; -} - bool kexec_loaded(void) { _cleanup_free_ char *s = NULL; @@ -184,112 +147,6 @@ int prot_from_flags(int flags) { } } -int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) { - bool stdout_is_tty, stderr_is_tty; - pid_t parent_pid, agent_pid; - sigset_t ss, saved_ss; - unsigned n, i; - va_list ap; - char **l; - - assert(pid); - assert(path); - - /* Spawns a temporary TTY agent, making sure it goes away when - * we go away */ - - parent_pid = getpid_cached(); - - /* First we temporarily block all signals, so that the new - * child has them blocked initially. This way, we can be sure - * that SIGTERMs are not lost we might send to the agent. */ - assert_se(sigfillset(&ss) >= 0); - assert_se(sigprocmask(SIG_SETMASK, &ss, &saved_ss) >= 0); - - agent_pid = fork(); - if (agent_pid < 0) { - assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0); - return -errno; - } - - if (agent_pid != 0) { - assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0); - *pid = agent_pid; - return 0; - } - - /* In the child: - * - * Make sure the agent goes away when the parent dies */ - if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) - _exit(EXIT_FAILURE); - - /* Make sure we actually can kill the agent, if we need to, in - * case somebody invoked us from a shell script that trapped - * SIGTERM or so... */ - (void) reset_all_signal_handlers(); - (void) reset_signal_mask(); - - /* Check whether our parent died before we were able - * to set the death signal and unblock the signals */ - if (getppid() != parent_pid) - _exit(EXIT_SUCCESS); - - /* Don't leak fds to the agent */ - close_all_fds(except, n_except); - - stdout_is_tty = isatty(STDOUT_FILENO); - stderr_is_tty = isatty(STDERR_FILENO); - - if (!stdout_is_tty || !stderr_is_tty) { - int fd; - - /* Detach from stdout/stderr. and reopen - * /dev/tty for them. This is important to - * ensure that when systemctl is started via - * popen() or a similar call that expects to - * read EOF we actually do generate EOF and - * not delay this indefinitely by because we - * keep an unused copy of stdin around. */ - fd = open("/dev/tty", O_WRONLY); - if (fd < 0) { - log_error_errno(errno, "Failed to open /dev/tty: %m"); - _exit(EXIT_FAILURE); - } - - if (!stdout_is_tty && dup2(fd, STDOUT_FILENO) < 0) { - log_error_errno(errno, "Failed to dup2 /dev/tty: %m"); - _exit(EXIT_FAILURE); - } - - if (!stderr_is_tty && dup2(fd, STDERR_FILENO) < 0) { - log_error_errno(errno, "Failed to dup2 /dev/tty: %m"); - _exit(EXIT_FAILURE); - } - - if (fd > STDERR_FILENO) - close(fd); - } - - /* Count arguments */ - va_start(ap, path); - for (n = 0; va_arg(ap, char*); n++) - ; - va_end(ap); - - /* Allocate strv */ - l = alloca(sizeof(char *) * (n + 1)); - - /* Fill in arguments */ - va_start(ap, path); - for (i = 0; i <= n; i++) - l[i] = va_arg(ap, char*); - va_end(ap); - - execv(path, l); - _exit(EXIT_FAILURE); -} - bool in_initrd(void) { struct statfs s; @@ -617,31 +474,22 @@ uint64_t physical_memory_scale(uint64_t v, uint64_t max) { uint64_t system_tasks_max(void) { -#if SIZEOF_PID_T == 4 -#define TASKS_MAX ((uint64_t) (INT32_MAX-1)) -#elif SIZEOF_PID_T == 2 -#define TASKS_MAX ((uint64_t) (INT16_MAX-1)) -#else -#error "Unknown pid_t size" -#endif - - _cleanup_free_ char *value = NULL, *root = NULL; uint64_t a = TASKS_MAX, b = TASKS_MAX; + _cleanup_free_ char *root = NULL; /* Determine the maximum number of tasks that may run on this system. We check three sources to determine this * limit: * - * a) the maximum value for the pid_t type + * a) the maximum tasks value the kernel allows on this architecture * b) the cgroups pids_max attribute for the system - * c) the kernel's configure maximum PID value + * c) the kernel's configured maximum PID value * * And then pick the smallest of the three */ - if (read_one_line_file("/proc/sys/kernel/pid_max", &value) >= 0) - (void) safe_atou64(value, &a); + (void) procfs_tasks_get_limit(&a); if (cg_get_root_path(&root) >= 0) { - value = mfree(value); + _cleanup_free_ char *value = NULL; if (cg_get_attribute("pids", root, "pids.max", &value) >= 0) (void) safe_atou64(value, &b); @@ -699,131 +547,76 @@ int version(void) { return 0; } -int get_block_device(const char *path, dev_t *dev) { - struct stat st; - struct statfs sfs; - - assert(path); - assert(dev); - - /* Get's the block device directly backing a file system. If - * the block device is encrypted, returns the device mapper - * block device. */ - - if (lstat(path, &st)) - return -errno; - - if (major(st.st_dev) != 0) { - *dev = st.st_dev; - return 1; - } - - if (statfs(path, &sfs) < 0) - return -errno; - - if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC)) - return btrfs_get_block_device(path, dev); - - return 0; +/* This is a direct translation of str_verscmp from boot.c */ +static bool is_digit(int c) { + return c >= '0' && c <= '9'; } -int get_block_device_harder(const char *path, dev_t *dev) { - _cleanup_closedir_ DIR *d = NULL; - _cleanup_free_ char *t = NULL; - char p[SYS_BLOCK_PATH_MAX("/slaves")]; - struct dirent *de, *found = NULL; - const char *q; - unsigned maj, min; - dev_t dt; - int r; - - assert(path); - assert(dev); +static int c_order(int c) { + if (c == 0 || is_digit(c)) + return 0; - /* Gets the backing block device for a file system, and - * handles LUKS encrypted file systems, looking for its - * immediate parent, if there is one. */ + if ((c >= 'a') && (c <= 'z')) + return c; - r = get_block_device(path, &dt); - if (r <= 0) - return r; + return c + 0x10000; +} - xsprintf_sys_block_path(p, "/slaves", dt); - d = opendir(p); - if (!d) { - if (errno == ENOENT) - goto fallback; +int str_verscmp(const char *s1, const char *s2) { + const char *os1, *os2; - return -errno; - } + assert(s1); + assert(s2); - FOREACH_DIRENT_ALL(de, d, return -errno) { + os1 = s1; + os2 = s2; - if (dot_or_dot_dot(de->d_name)) - continue; + while (*s1 || *s2) { + int first; - if (!IN_SET(de->d_type, DT_LNK, DT_UNKNOWN)) - continue; + while ((*s1 && !is_digit(*s1)) || (*s2 && !is_digit(*s2))) { + int order; - if (found) { - _cleanup_free_ char *u = NULL, *v = NULL, *a = NULL, *b = NULL; - - /* We found a device backed by multiple other devices. We don't really support automatic - * discovery on such setups, with the exception of dm-verity partitions. In this case there are - * two backing devices: the data partition and the hash partition. We are fine with such - * setups, however, only if both partitions are on the same physical device. Hence, let's - * verify this. */ - - u = strjoin(p, "/", de->d_name, "/../dev"); - if (!u) - return -ENOMEM; - - v = strjoin(p, "/", found->d_name, "/../dev"); - if (!v) - return -ENOMEM; - - r = read_one_line_file(u, &a); - if (r < 0) { - log_debug_errno(r, "Failed to read %s: %m", u); - goto fallback; - } - - r = read_one_line_file(v, &b); - if (r < 0) { - log_debug_errno(r, "Failed to read %s: %m", v); - goto fallback; - } - - /* Check if the parent device is the same. If not, then the two backing devices are on - * different physical devices, and we don't support that. */ - if (!streq(a, b)) - goto fallback; + order = c_order(*s1) - c_order(*s2); + if (order != 0) + return order; + s1++; + s2++; } - found = de; - } - - if (!found) - goto fallback; + while (*s1 == '0') + s1++; + while (*s2 == '0') + s2++; + + first = 0; + while (is_digit(*s1) && is_digit(*s2)) { + if (first == 0) + first = *s1 - *s2; + s1++; + s2++; + } - q = strjoina(p, "/", found->d_name, "/dev"); + if (is_digit(*s1)) + return 1; + if (is_digit(*s2)) + return -1; - r = read_one_line_file(q, &t); - if (r == -ENOENT) - goto fallback; - if (r < 0) - return r; + if (first != 0) + return first; + } - if (sscanf(t, "%u:%u", &maj, &min) != 2) - return -EINVAL; + return strcmp(os1, os2); +} - if (maj == 0) - goto fallback; +/* Turn off core dumps but only if we're running outside of a container. */ +void disable_coredumps(void) { + int r; - *dev = makedev(maj, min); - return 1; + if (detect_container() > 0) + return; -fallback: - *dev = dt; - return 1; + r = write_string_file("/proc/sys/kernel/core_pattern", "|/bin/false", 0); + if (r < 0) + log_debug_errno(r, "Failed to turn off coredumps, ignoring: %m"); } |