Linux Manuals session 3

sd_journal_add_match, sd_journal_add_disjunction, sd_journal_add_conjunction, sd_journal_flush_matches – Add or remove entry matches Synopsis #include <systemd/sd-journal.h> int sd_journal_add_match(sd_journal *j, const void *data, size_t size); int sd_journal_add_disjunction(sd_journal *j); int sd_journal_add_conjunction(sd_journal *j); void sd_journal_flush_matches(sd_journal *j); Description sd_journal_add_match() adds a match by which to filter the entries of the journal file. Matches applied with this call will filter what can be…

sd_journal_query_unique, sd_journal_enumerate_unique, sd_journal_restart_unique, SD_JOURNAL_FOREACH_UNIQUE – Read unique data fields from the journal Synopsis #include <systemd/sd-journal.h> int sd_journal_query_unique(sd_journal *j, const char *field); int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *length); void sd_journal_restart_unique(sd_journal *j); SD_JOURNAL_FOREACH_UNIQUE(sd_journal *j, const void *data, size_t length); Description sd_journal_query_unique() queries the journal for all unique values the specified field can take. It takes…

sd_journal_get_data, sd_journal_enumerate_data, sd_journal_restart_data, SD_JOURNAL_FOREACH_DATA, sd_journal_set_data_threshold, sd_journal_get_data_threshold – Read data fields from the current journal entry Synopsis #include <systemd/sd-journal.h> int sd_journal_get_data(sd_journal *j, const char *field, const void **data, size_t *length); int sd_journal_enumerate_data(sd_journal *j, const void **data, size_t *length); void sd_journal_restart_data(sd_journal *j); SD_JOURNAL_FOREACH_DATA(sd_journal *j, const void *data, size_t length); int sd_journal_set_data_threshold(sd_journal *j, size_t sz); int sd_journal_get_data_threshold(sd_journal *j,…

sd_journal_open, sd_journal_open_directory, sd_journal_open_files, sd_journal_open_container, sd_journal_close, sd_journal, SD_JOURNAL_LOCAL_ONLY, SD_JOURNAL_RUNTIME_ONLY, SD_JOURNAL_SYSTEM, SD_JOURNAL_CURRENT_USER – Open the system journal for reading Synopsis #include <systemd/sd-journal.h> int sd_journal_open(sd_journal **ret, int flags); int sd_journal_open_directory(sd_journal **ret, const char *path, int flags); int sd_journal_open_files(sd_journal **ret, const char **paths, int flags); int sd_journal_open_container(sd_journal **ret, const char *machine, int flags); void sd_journal_close(sd_journal *j); Description sd_journal_open() opens…

sd_journal_add_match, sd_journal_add_disjunction, sd_journal_add_conjunction, sd_journal_flush_matches – Add or remove entry matches Synopsis #include <systemd/sd-journal.h> int sd_journal_add_match(sd_journal *j, const void *data, size_t size); int sd_journal_add_disjunction(sd_journal *j); int sd_journal_add_conjunction(sd_journal *j); void sd_journal_flush_matches(sd_journal *j); Description sd_journal_add_match() adds a match by which to filter the entries of the journal file. Matches applied with this call will filter what can be…

sd_journal_add_match, sd_journal_add_disjunction, sd_journal_add_conjunction, sd_journal_flush_matches – Add or remove entry matches Synopsis #include <systemd/sd-journal.h> int sd_journal_add_match(sd_journal *j, const void *data, size_t size); int sd_journal_add_disjunction(sd_journal *j); int sd_journal_add_conjunction(sd_journal *j); void sd_journal_flush_matches(sd_journal *j); Description sd_journal_add_match() adds a match by which to filter the entries of the journal file. Matches applied with this call will filter what can be…

sd_journal_add_match, sd_journal_add_disjunction, sd_journal_add_conjunction, sd_journal_flush_matches – Add or remove entry matches Synopsis #include <systemd/sd-journal.h> int sd_journal_add_match(sd_journal *j, const void *data, size_t size); int sd_journal_add_disjunction(sd_journal *j); int sd_journal_add_conjunction(sd_journal *j); void sd_journal_flush_matches(sd_journal *j); Description sd_journal_add_match() adds a match by which to filter the entries of the journal file. Matches applied with this call will filter what can be…

sd_journal_open, sd_journal_open_directory, sd_journal_open_files, sd_journal_open_container, sd_journal_close, sd_journal, SD_JOURNAL_LOCAL_ONLY, SD_JOURNAL_RUNTIME_ONLY, SD_JOURNAL_SYSTEM, SD_JOURNAL_CURRENT_USER – Open the system journal for reading Synopsis #include <systemd/sd-journal.h> int sd_journal_open(sd_journal **ret, int flags); int sd_journal_open_directory(sd_journal **ret, const char *path, int flags); int sd_journal_open_files(sd_journal **ret, const char **paths, int flags); int sd_journal_open_container(sd_journal **ret, const char *machine, int flags); void sd_journal_close(sd_journal *j); Description sd_journal_open() opens…

sd_is_fifo, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix, sd_is_mq, sd_is_special – Check the type of a file descriptor Synopsis #include <systemd/sd-daemon.h> int sd_is_fifo(int fd, const char *path); int sd_is_socket(int fd, int family, int type, int listening); int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port); int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);…

sd_is_fifo, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix, sd_is_mq, sd_is_special – Check the type of a file descriptor Synopsis #include <systemd/sd-daemon.h> int sd_is_fifo(int fd, const char *path); int sd_is_socket(int fd, int family, int type, int listening); int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port); int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);…

sd_is_fifo, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix, sd_is_mq, sd_is_special – Check the type of a file descriptor Synopsis #include <systemd/sd-daemon.h> int sd_is_fifo(int fd, const char *path); int sd_is_socket(int fd, int family, int type, int listening); int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port); int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);…

sd_is_fifo, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix, sd_is_mq, sd_is_special – Check the type of a file descriptor Synopsis #include <systemd/sd-daemon.h> int sd_is_fifo(int fd, const char *path); int sd_is_socket(int fd, int family, int type, int listening); int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port); int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);…

sd_is_fifo, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix, sd_is_mq, sd_is_special – Check the type of a file descriptor Synopsis #include <systemd/sd-daemon.h> int sd_is_fifo(int fd, const char *path); int sd_is_socket(int fd, int family, int type, int listening); int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port); int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);…

sd_is_fifo, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix, sd_is_mq, sd_is_special – Check the type of a file descriptor Synopsis #include <systemd/sd-daemon.h> int sd_is_fifo(int fd, const char *path); int sd_is_socket(int fd, int family, int type, int listening); int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port); int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);…

sd_is_fifo, sd_is_socket, sd_is_socket_inet, sd_is_socket_unix, sd_is_mq, sd_is_special – Check the type of a file descriptor Synopsis #include <systemd/sd-daemon.h> int sd_is_fifo(int fd, const char *path); int sd_is_socket(int fd, int family, int type, int listening); int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port); int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length);…

sd_id128_to_string, sd_id128_from_string – Format or parse 128-bit IDs as strings Synopsis #include <systemd/sd-id128.h> char *sd_id128_to_string(sd_id128_t id, char s[33]); int sd_id128_from_string(const char *s, sd_id128_t *ret); Description sd_id128_to_string() formats a 128-bit ID as a character string. It expects the ID and a string array capable of storing 33 characters. The ID will be formatted as 32 lowercase…

sd-id128, sd_id128_t, SD_ID128_MAKE, SD_ID128_CONST_STR, SD_ID128_FORMAT_STR, SD_ID128_FORMAT_VAL, sd_id128_equal – APIs for processing 128-bit IDs Synopsis #include <systemd/sd-id128.h> pkg-config –cflags –libs libsystemd Description sd-id128.h provides APIs to process and generate 128-bit ID values. The 128-bit ID values processed and generated by these APIs are a generalization of OSF UUIDs as defined by m[blue]RFC 4122m[][1] but use a…

sd_id128_randomize – Generate 128-bit IDs Synopsis #include <systemd/sd-id128.h> int sd_id128_randomize(sd_id128_t *ret); Description sd_id128_randomize() generates a new randomized 128-bit ID and returns it in ret. Every invocation returns a new randomly generated ID. This uses the /dev/urandom kernel random number generator. Note that sd_id128_randomize() always returns a UUID v4-compatible ID. For more information about the "sd_id128_t"…

sd_id128_get_machine, sd_id128_get_boot – Retrieve 128-bit IDs Synopsis #include <systemd/sd-id128.h> int sd_id128_get_machine(sd_id128_t *ret); int sd_id128_get_boot(sd_id128_t *ret); Description sd_id128_get_machine() returns the machine ID of the executing host. This reads and parses the machine-id(5) file. This function caches the machine ID internally to make retrieving the machine ID a cheap operation. sd_id128_get_boot() returns the boot ID of the…

sd_id128_get_machine, sd_id128_get_boot – Retrieve 128-bit IDs Synopsis #include <systemd/sd-id128.h> int sd_id128_get_machine(sd_id128_t *ret); int sd_id128_get_boot(sd_id128_t *ret); Description sd_id128_get_machine() returns the machine ID of the executing host. This reads and parses the machine-id(5) file. This function caches the machine ID internally to make retrieving the machine ID a cheap operation. sd_id128_get_boot() returns the boot ID of the…