Section 3: library functions
sigwait – wait for a signal Synopsis #include <signal.h> int sigwait(const sigset_t *set, int *sig); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigwait(): Since glibc 2.26: _POSIX_C_SOURCE >= 199506L Glibc 2.25 and earlier: _POSIX_C_SOURCE Description The sigwait() function suspends execution of the calling thread until one of the signals specified in the signal set set becomes…
sigvec, sigblock, sigsetmask, siggetmask, sigmask – BSD signal API Synopsis #include <signal.h> int sigvec(int sig, const struct sigvec *vec, struct sigvec *ovec); int sigmask(int signum); int sigblock(int mask); int sigsetmask(int mask); int siggetmask(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All functions shown above: Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _BSD_SOURCE Description…
sigvec, sigblock, sigsetmask, siggetmask, sigmask – BSD signal API Synopsis #include <signal.h> int sigvec(int sig, const struct sigvec *vec, struct sigvec *ovec); int sigmask(int signum); int sigblock(int mask); int sigsetmask(int mask); int siggetmask(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All functions shown above: Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _BSD_SOURCE Description…
sigvec, sigblock, sigsetmask, siggetmask, sigmask – BSD signal API Synopsis #include <signal.h> int sigvec(int sig, const struct sigvec *vec, struct sigvec *ovec); int sigmask(int signum); int sigblock(int mask); int sigsetmask(int mask); int siggetmask(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All functions shown above: Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _BSD_SOURCE Description…
system_data_types – overview of system data types Description aiocb Include: <aio.h>. struct aiocb { int aio_fildes; /* File descriptor */ off_t aio_offset; /* File offset */ volatile void *aio_buf; /* Location of buffer */ size_t aio_nbytes; /* Length of transfer */ int aio_reqprio; /* Request priority offset */ struct sigevent aio_sigevent; /* Signal number and…
sigaltstack – set and/or get signal stack context Synopsis #include <signal.h> int sigaltstack(const stack_t *ss, stack_t *old_ss); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigaltstack(): _XOPEN_SOURCE >= 500 || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L || /* Glibc versions <= 2.19: */ _BSD_SOURCE Description sigaltstack() allows a thread to define a new alternate signal stack and/or retrieve the state of an existing alternate signal stack. An…
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember – POSIX signal set operations Synopsis #include <signal.h> int sigemptyset(sigset_t *set); int sigfillset(sigset_t *set); int sigaddset(sigset_t *set, int signum); int sigdelset(sigset_t *set, int signum); int sigismember(const sigset_t *set, int signum); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigemptyset(), sigfillset(), sigaddset(), sigdelset(), sigismember(): _POSIX_C_SOURCE Description These functions allow the manipulation…
sigvec, sigblock, sigsetmask, siggetmask, sigmask – BSD signal API Synopsis #include <signal.h> int sigvec(int sig, const struct sigvec *vec, struct sigvec *ovec); int sigmask(int signum); int sigblock(int mask); int sigsetmask(int mask); int siggetmask(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): All functions shown above: Since glibc 2.19: _DEFAULT_SOURCE Glibc 2.19 and earlier: _BSD_SOURCE Description…
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…
system_data_types – overview of system data types Description aiocb Include: <aio.h>. struct aiocb { int aio_fildes; /* File descriptor */ off_t aio_offset; /* File offset */ volatile void *aio_buf; /* Location of buffer */ size_t aio_nbytes; /* Length of transfer */ int aio_reqprio; /* Request priority offset */ struct sigevent aio_sigevent; /* Signal number and…
sigset, sighold, sigrelse, sigignore – System V signal API Synopsis #include <signal.h> typedef void (*sighandler_t)(int); sighandler_t sigset(int sig, sighandler_t disp); int sighold(int sig); int sigrelse(int sig); int sigignore(int sig); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigset(), sighold(), sigrelse(), sigignore(): _XOPEN_SOURCE >= 500 Description These functions are provided in glibc as a compatibility interface for programs…
sigset, sighold, sigrelse, sigignore – System V signal API Synopsis #include <signal.h> typedef void (*sighandler_t)(int); sighandler_t sigset(int sig, sighandler_t disp); int sighold(int sig); int sigrelse(int sig); int sigignore(int sig); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigset(), sighold(), sigrelse(), sigignore(): _XOPEN_SOURCE >= 500 Description These functions are provided in glibc as a compatibility interface for programs…
sigqueue – queue a signal and data to a process Synopsis #include <signal.h> int sigqueue(pid_t pid, int sig, const union sigval value); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigqueue(): _POSIX_C_SOURCE >= 199309L Description sigqueue() sends the signal specified in sig to the process whose PID is given in pid. The permissions required to send a…
sigpause – atomically release blocked signals and wait for interrupt Synopsis #include <signal.h> int sigpause(int sigmask); /* BSD (but see NOTES) */ int sigpause(int sig); /* System V / UNIX 95 */ Description Don’t use this function. Use sigsuspend(2) instead. The function sigpause() is designed to wait for some signal. It changes the process’s signal…
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember – POSIX signal set operations Synopsis #include <signal.h> int sigemptyset(sigset_t *set); int sigfillset(sigset_t *set); int sigaddset(sigset_t *set, int signum); int sigdelset(sigset_t *set, int signum); int sigismember(const sigset_t *set, int signum); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigemptyset(), sigfillset(), sigaddset(), sigdelset(), sigismember(): _POSIX_C_SOURCE Description These functions allow the manipulation…
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember – POSIX signal set operations Synopsis #include <signal.h> int sigemptyset(sigset_t *set); int sigfillset(sigset_t *set); int sigaddset(sigset_t *set, int signum); int sigdelset(sigset_t *set, int signum); int sigismember(const sigset_t *set, int signum); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigemptyset(), sigfillset(), sigaddset(), sigdelset(), sigismember(): _POSIX_C_SOURCE Description These functions allow the manipulation…
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember – POSIX signal set operations Synopsis #include <signal.h> int sigemptyset(sigset_t *set); int sigfillset(sigset_t *set); int sigaddset(sigset_t *set, int signum); int sigdelset(sigset_t *set, int signum); int sigismember(const sigset_t *set, int signum); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigemptyset(), sigfillset(), sigaddset(), sigdelset(), sigismember(): _POSIX_C_SOURCE Description These functions allow the manipulation…
significand, significandf, significandl – get mantissa of floating-point number Synopsis #include <math.h> double significand(double x); float significandf(float x); long double significandl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): significand(), significandf(), significandl(): /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE Description These functions return the mantissa of x scaled…
significand, significandf, significandl – get mantissa of floating-point number Synopsis #include <math.h> double significand(double x); float significandf(float x); long double significandl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): significand(), significandf(), significandl(): /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE Description These functions return the mantissa of x scaled…
significand, significandf, significandl – get mantissa of floating-point number Synopsis #include <math.h> double significand(double x); float significandf(float x); long double significandl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see feature_test_macros(7)): significand(), significandf(), significandl(): /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE Description These functions return the mantissa of x scaled…