...d macro is described in the man page. For further information on feature test macros, see feature_test_macros (7). STANDARDS Certain terms and abbreviations are used to indicate…...SIS #include <unistd.h> int vhangup(void); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): vhangup (): Since glibc 2.21: _DEFAULT_SOURCE In glibc 2.19 a…...ime.h> int timer_delete(timer_t timerid ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): timer_delete (): _POSIX_C_SOURCE >= 199309L DESCRIPTION timer…...deprecated]] int stime(const time_t * t ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): stime (): Since glibc 2.19: _DEFAULT_SOURCE glibc 2.19 and ea…...clude <unistd.h> pid_t getsid(pid_t pid ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): getsid (): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _P…...#include <unistd.h> int getpagesize(void); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): getpagesize (): Since glibc 2.20: _DEFAULT_SOURCE || ! (_POSI…...nt fsync(int fd ); int fdatasync(int fd ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): fsync (): glibc 2.16 and later: No feature test macros need b…...nt fsync(int fd ); int fdatasync(int fd ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): fsync (): glibc 2.16 and later: No feature test macros need b…...IS #include <unistd.h> int nice(int inc ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): nice (): _XOPEN_SOURCE || /* Since glibc 2.19: */ _DEFAULT_SO…...int acct(const char *_Nullable filename ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): acct (): Since glibc 2.21: _DEFAULT_SOURCE In glibc 2.19 and …...(const char * path ); int fchdir(int fd ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): fchdir (): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _P…...(const char * path ); int fchdir(int fd ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): fchdir (): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _P…...er or _DEFAULT_SOURCE in glibc 2.19 and later. (By default, these macros are defined; see feature_test_macros (7) for details.) If such a feature test macro is not defined, then…...tions , struct rusage *_Nullable rusage ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): wait3 (): Since glibc 2.26: _DEFAULT_SOURCE || (_XOPEN_SOURCE…...tions , struct rusage *_Nullable rusage ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): wait3 (): Since glibc 2.26: _DEFAULT_SOURCE || (_XOPEN_SOURCE…...mainname(const char * name , size_t len ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): getdomainname (), setdomainname (): Since glibc 2.21: _DEFAUL…...mainname(const char * name , size_t len ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): getdomainname (), setdomainname (): Since glibc 2.21: _DEFAUL…...athname , const struct timeval times [2]); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): futimesat (): _GNU_SOURCE DESCRIPTION This system call is obs…...d.h> void sync(void); int syncfs(int fd ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): sync (): _XOPEN_SOURCE >= 500 || /* Since glibc 2.19: */ _DEF…...d.h> void sync(void); int syncfs(int fd ); Feature Test Macro Requirements for glibc (see feature_test_macros (7)): sync (): _XOPEN_SOURCE >= 500 || /* Since glibc 2.19: */ _DEF…