diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/basic/util.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/basic/util.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/basic/util.c b/src/basic/util.c new file mode 100644 index 0000000..e6aaa2d --- /dev/null +++ b/src/basic/util.c @@ -0,0 +1,140 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> +#include <fcntl.h> +#include <sys/mman.h> + +#include "alloc-util.h" +#include "build.h" +#include "env-file.h" +#include "env-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "hostname-util.h" +#include "log.h" +#include "macro.h" +#include "parse-util.h" +#include "stat-util.h" +#include "string-util.h" +#include "util.h" +#include "virt.h" + +int saved_argc = 0; +char **saved_argv = NULL; +static int saved_in_initrd = -1; + +bool kexec_loaded(void) { + _cleanup_free_ char *s = NULL; + + if (read_one_line_file("/sys/kernel/kexec_loaded", &s) < 0) + return false; + + return s[0] == '1'; +} + +int prot_from_flags(int flags) { + + switch (flags & O_ACCMODE) { + + case O_RDONLY: + return PROT_READ; + + case O_WRONLY: + return PROT_WRITE; + + case O_RDWR: + return PROT_READ|PROT_WRITE; + + default: + return -EINVAL; + } +} + +bool in_initrd(void) { + int r; + + if (saved_in_initrd >= 0) + return saved_in_initrd; + + /* If /etc/initrd-release exists, we're in an initrd. + * This can be overridden by setting SYSTEMD_IN_INITRD=0|1. + */ + + r = getenv_bool_secure("SYSTEMD_IN_INITRD"); + if (r < 0 && r != -ENXIO) + log_debug_errno(r, "Failed to parse $SYSTEMD_IN_INITRD, ignoring: %m"); + + if (r >= 0) + saved_in_initrd = r > 0; + else { + r = access("/etc/initrd-release", F_OK); + if (r < 0 && errno != ENOENT) + log_debug_errno(r, "Failed to check if /etc/initrd-release exists, assuming it does not: %m"); + saved_in_initrd = r >= 0; + } + + return saved_in_initrd; +} + +void in_initrd_force(bool value) { + saved_in_initrd = value; +} + +int container_get_leader(const char *machine, pid_t *pid) { + _cleanup_free_ char *s = NULL, *class = NULL; + const char *p; + pid_t leader; + int r; + + assert(machine); + assert(pid); + + if (streq(machine, ".host")) { + *pid = 1; + return 0; + } + + if (!hostname_is_valid(machine, 0)) + return -EINVAL; + + p = strjoina("/run/systemd/machines/", machine); + r = parse_env_file(NULL, p, + "LEADER", &s, + "CLASS", &class); + if (r == -ENOENT) + return -EHOSTDOWN; + if (r < 0) + return r; + if (!s) + return -EIO; + + if (!streq_ptr(class, "container")) + return -EIO; + + r = parse_pid(s, &leader); + if (r < 0) + return r; + if (leader <= 1) + return -EIO; + + *pid = leader; + return 0; +} + +int version(void) { + printf("systemd " STRINGIFY(PROJECT_VERSION) " (" GIT_VERSION ")\n%s\n", + systemd_features); + return 0; +} + +/* Turn off core dumps but only if we're running outside of a container. */ +void disable_coredumps(void) { + int r; + + if (detect_container() > 0) + return; + + r = write_string_file("/proc/sys/kernel/core_pattern", "|/bin/false", WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + log_debug_errno(r, "Failed to turn off coredumps, ignoring: %m"); +} |