Linux Manuals session 3

getkeycreatecon, setkeycreatecon – get or set the SELinux security context used for creating a new kernel keyrings Synopsis #include <selinux/selinux.h> int getkeycreatecon(char **con); int getkeycreatecon_raw(char **con); int setkeycreatecon(char *context); int setkeycreatecon_raw(char *context); Description getkeycreatecon() retrieves the context used for creating a new kernel keyring. This returned context should be freed with freecon(3) if non-NULL. getkeycreatecon()…

getkeycreatecon, setkeycreatecon – get or set the SELinux security context used for creating a new kernel keyrings Synopsis #include <selinux/selinux.h> int getkeycreatecon(char **con); int getkeycreatecon_raw(char **con); int setkeycreatecon(char *context); int setkeycreatecon_raw(char *context); Description getkeycreatecon() retrieves the context used for creating a new kernel keyring. This returned context should be freed with freecon(3) if non-NULL. getkeycreatecon()…

encrypt, setkey, encrypt_r, setkey_r – encrypt 64-bit messages Synopsis #define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <unistd.h> void encrypt(char block[64], int edflag); #define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> void setkey(const char *key); #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <crypt.h> void setkey_r(const char *key, struct crypt_data *data); void encrypt_r(char *block, int edflag, struct…

encrypt, setkey, encrypt_r, setkey_r – encrypt 64-bit messages Synopsis #define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <unistd.h> void encrypt(char block[64], int edflag); #define _XOPEN_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> void setkey(const char *key); #define _GNU_SOURCE /* See feature_test_macros(7) */ #include <crypt.h> void setkey_r(const char *key, struct crypt_data *data); void encrypt_r(char *block, int edflag, struct…

setjmp, sigsetjmp, longjmp, siglongjmp – performing a nonlocal goto Synopsis #include <setjmp.h> int setjmp(jmp_buf env); int sigsetjmp(sigjmp_buf env, int savesigs); void longjmp(jmp_buf env, int val); void siglongjmp(sigjmp_buf env, int val); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): setjmp(): see NOTES. sigsetjmp(): _POSIX_C_SOURCE Description The functions described on this page are used for performing "nonlocal…

gethostid, sethostid – get or set the unique identifier of the current host Synopsis #include <unistd.h> long gethostid(void); int sethostid(long hostid); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): gethostid(): _BSD_SOURCE || _XOPEN_SOURCE >= 500 sethostid(): Since glibc 2.21: _DEFAULT_SOURCE In glibc 2.19 and 2.20: _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500) Up to and including glibc 2.19: _BSD_SOURCE…

gethostbyname, gethostbyaddr, sethostent, gethostent, endhostent, h_errno, herror, hstrerror, gethostbyaddr_r, gethostbyname2, gethostbyname2_r, gethostbyname_r, gethostent_r – get network host entry Synopsis #include <netdb.h> extern int h_errno; struct hostent *gethostbyname(const char *name); #include <sys/socket.h> /* for AF_INET */ struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type); void sethostent(int stayopen); void endhostent(void); void herror(const char *s); const char…

getgrent, setgrent, endgrent – get group file entry Synopsis #include <grp.h> #include <sys/types.h> struct group *getgrent(void); void setgrent(void); void endgrent(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): setgrent(): _XOPEN_SOURCE >= 500     || /* Glibc since 2.19: */ _DEFAULT_SOURCE     || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE getgrent(), endgrent(): Since glibc 2.22:     _XOPEN_SOURCE >= 500 ||         _DEFAULT_SOURCE Glibc 2.21 and earlier     _XOPEN_SOURCE >= 500         || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L         || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE…

getfsent, getfsspec, getfsfile, setfsent, endfsent – handle fstab entries Synopsis #include <fstab.h> void endfsent(void); struct fstab *getfsent(void); struct fstab *getfsfile(const char *mount_point); struct fstab *getfsspec(const char *special_file); int setfsent(void); Description These functions read from the file /etc/fstab. The struct fstab is defined by: struct fstab { char *fs_spec; /* block device name */ char *fs_file;…

getfscreatecon, setfscreatecon – get or set the SELinux security context used for creating a new file system object Synopsis #include <selinux/selinux.h> int getfscreatecon(char **con); int getfscreatecon_raw(char **con); int setfscreatecon(char *context); int setfscreatecon_raw(char *context); Description getfscreatecon() retrieves the context used for creating a new file system object. This returned context should be freed with freecon(3) if…

getfscreatecon, setfscreatecon – get or set the SELinux security context used for creating a new file system object Synopsis #include <selinux/selinux.h> int getfscreatecon(char **con); int getfscreatecon_raw(char **con); int setfscreatecon(char *context); int setfscreatecon_raw(char *context); Description getfscreatecon() retrieves the context used for creating a new file system object. This returned context should be freed with freecon(3) if…

setfilecon, fsetfilecon, lsetfilecon – set SELinux security context of a file Synopsis #include <selinux/selinux.h> int setfilecon(const char *path, char *con); int setfilecon_raw(const char *path, char *con); int lsetfilecon(const char *path, char *con); int lsetfilecon_raw(const char *path, char *con); int fsetfilecon(int fd, char *con); int fsetfilecon_raw(int fd, char *con); Description setfilecon() sets the security context of…

setfilecon, fsetfilecon, lsetfilecon – set SELinux security context of a file Synopsis #include <selinux/selinux.h> int setfilecon(const char *path, char *con); int setfilecon_raw(const char *path, char *con); int lsetfilecon(const char *path, char *con); int lsetfilecon_raw(const char *path, char *con); int fsetfilecon(int fd, char *con); int fsetfilecon_raw(int fd, char *con); Description setfilecon() sets the security context of…

getexeccon, setexeccon – get or set the SELinux security context used for executing a new process rpm_execcon – run a helper for rpm in an appropriate security context Synopsis #include <selinux/selinux.h> int getexeccon(char **context); int getexeccon_raw(char **context); int setexeccon(char *context); int setexeccon_raw(char *context); int setexecfilecon(const char *filename, const char *fallback_type); int rpm_execcon(unsigned int verified, const…

getexeccon, setexeccon – get or set the SELinux security context used for executing a new process rpm_execcon – run a helper for rpm in an appropriate security context Synopsis #include <selinux/selinux.h> int getexeccon(char **context); int getexeccon_raw(char **context); int setexeccon(char *context); int setexeccon_raw(char *context); int setexecfilecon(const char *filename, const char *fallback_type); int rpm_execcon(unsigned int verified, const…

setenv – change or add an environment variable Synopsis #include <stdlib.h> int setenv(const char *name, const char *value, int overwrite); int unsetenv(const char *name); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): setenv(), unsetenv(): _POSIX_C_SOURCE >= 200112L     || /* Glibc versions <= 2.19: */ _BSD_SOURCE Description The setenv() function adds the variable name to the environment with the value value, if name does…

getcontext, setcontext – get or set the user context Synopsis #include <ucontext.h> int getcontext(ucontext_t *ucp); int setcontext(const ucontext_t *ucp); Description In a System V-like environment, one has the two types mcontext_t and ucontext_t defined in <ucontext.h> and the four functions getcontext(), setcontext(), makecontext(3), and swapcontext(3) that allow user-level context switching between multiple threads of control…

getcon, getprevcon, getpidcon – get SELinux security context of a process freecon, freeconary – free memory associated with SELinux security contexts getpeercon – get security context of a peer socket setcon – set current security context of a process Synopsis #include <selinux/selinux.h> int getcon(char **context); int getcon_raw(char **context); int getprevcon(char **context); int getprevcon_raw(char **context); int…

getcon, getprevcon, getpidcon – get SELinux security context of a process freecon, freeconary – free memory associated with SELinux security contexts getpeercon – get security context of a peer socket setcon – set current security context of a process Synopsis #include <selinux/selinux.h> int getcon(char **context); int getcon_raw(char **context); int getprevcon(char **context); int getprevcon_raw(char **context); int…

setbuf, setbuffer, setlinebuf, setvbuf – stream buffering operations Synopsis #include <stdio.h> void setbuf(FILE *stream, char *buf); void setbuffer(FILE *stream, char *buf, size_t size); void setlinebuf(FILE *stream); int setvbuf(FILE *stream, char *buf, int mode, size_t size); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): setbuffer(), setlinebuf():     Since glibc 2.19:         _DEFAULT_SOURCE     Glibc 2.19 and earlier:         _BSD_SOURCE Description…