F
| Function | Classification | Library | Cancel | ISR | Signal | Thread |
|---|---|---|---|---|---|---|
| fabs() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fabsf() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fabsl() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| faccessat() | POSIX 2008 | libc | No | No | Yes | Yes |
| fcfgopen() | QNX Neutrino | libc | Yes | No | Yes | Yes |
| fchdir() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| fchecktrust() | QNX Neutrino | libc | No | No | Yes | Yes |
| fchmod() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| fchmodat() | POSIX 2008 | libc | No | No | Yes | Yes |
| fchown() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| fchownat() | POSIX 2008 | libc | No | No | Yes | Yes |
| fclose() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fcloseall() | QNX Neutrino | libc | Yes | No | No | Yes |
| fcntl() | POSIX 1003.1 | libc | Read the Caveats | No | Yes | Yes |
| fdatasync() | POSIX 1003.1 SIO | libc | Yes | No | Yes | Yes |
| fdim() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fdimf() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fdiml() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fdistrusted() | QNX Neutrino | libc | No | No | Yes | Yes |
| fdopen() | POSIX 1003.1 | libc | No | No | No | Yes |
| fdopendir() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| feclearexcept() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fedisableexcept() | BSD, QNX Neutrino | libm, libm-sve | No | Yes | Yes | Yes |
| feenableexcept() | BSD, QNX Neutrino | libm, libm-sve | No | Yes | Yes | Yes |
| fegetenv() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fegetexceptflag() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fegetprec() | QNX Neutrino | libm, libm-sve | No | Yes | Yes | Yes |
| fegetround() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| feholdexcept() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| feof() | ANSI, POSIX 1003.1 | libc | No | No | No | Yes |
| feraiseexcept() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| ferror() | ANSI, POSIX 1003.1 | libc | No | No | No | Yes |
| fesetenv() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fesetexceptflag() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fesetprec() | QNX Neutrino | libm, libm-sve | No | Yes | Yes | Yes |
| fesetround() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fetestexcept() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| feupdateenv() | C99, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fflush() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| ffs() | POSIX 1003.1 XSI | libc | No | No | Yes | Yes |
| ffsl() | libc | No | No | Yes | Yes | |
| ffsll() | Unix | libc | No | No | Yes | Yes |
| fgetc() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fgetpos() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fgets() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fgetspent() | Unix | libc | Yes | No | No | No |
| fgetwc() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fgetws() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fileno() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| flink() | Unix | libc | No | No | Yes | Yes |
| flock() | Unix | libc | No | No | Yes | Yes |
| flockfile() | POSIX 1003.1 | libc | No | No | No | Yes |
| floor() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| floorf() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| floorl() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fls() | Unix | libc | No | No | Yes | Yes |
| flsl() | Unix | libc | No | No | Yes | Yes |
| flsll() | Unix | libc | No | No | Yes | Yes |
| fma() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmaf() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmal() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmax() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmaxf() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmaxl() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmin() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fminf() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fminl() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmod() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmodf() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fmodl() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fnmatch() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| _fnmatchv() | QNX Neutrino | libc | No | No | Yes | Yes |
| fopen() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fopen64() | Large-file support | libc | Yes | No | No | Yes |
| fork() | POSIX 1003.1 | libc | No | No | Yes | Read the Caveats |
| forkpty() | Unix | libc | Yes | No | Yes | Yes |
| forksafe_mutex_destroy() | QNX Neutrino | libc, libforksafe_mutex | No | No | Yes | Yes |
| forksafe_mutex_init() | QNX Neutrino | libc, libforksafe_mutex | No | No | Yes | Yes |
| forksafe_mutex_lock() | QNX Neutrino | libc, libforksafe_mutex | No | No | No | Yes |
| forksafe_mutex_trylock() | QNX Neutrino | libc, libforksafe_mutex | No | No | Yes | Yes |
| forksafe_mutex_unlock() | QNX Neutrino | libc, libforksafe_mutex | No | No | No | Yes |
| fpathconf() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| fpclassify() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fprintf() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fputc() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fputs() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fputwc() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fputws() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fread() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| free() | ANSI, POSIX 1003.1 | libc | No | No | No | Yes |
| freeaddrinfo() | POSIX 1003.1 | libsocket | No | No | No | Yes |
| freeifaddrs() | Unix | libsocket | No | No | No | Yes |
| freopen() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| freopen64() | Large-file support | libc | Yes | No | No | Yes |
| frexp() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| frexpf() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| frexpl() | C11, POSIX 1003.1 | libm, libm-sve | No | Yes | Yes | Yes |
| fs_crypto_check() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_add() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_add_flags() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_hard_lock() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_key_change() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_key_check() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_key_size() | QNX Neutrino | libfscrypto | No | No | No | Yes |
| fs_crypto_domain_lock() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_query() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_remove() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_unlock() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_whitelist_configure() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_whitelist_ctrl() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_whitelist_ctrl_access_grant() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_whitelist_ctrl_access_revoke() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_whitelist_get_flags() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_domain_whitelist_set_flags() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_enable() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_enable_option() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_file_get_domain() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_file_set_domain() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_key_gen() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_migrate_control() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_migrate_path() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_migrate_status() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_migrate_tag() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fs_crypto_set_logging() | QNX Neutrino | libfscrypto | Yes | No | No | Yes |
| fscanf() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fseek() | ANSI, POSIX 1003.1 | libc | Yes | No | Yes | Yes |
| fseeko() | POSIX 1003.1 | libc | Yes | No | Yes | Yes |
| fseeko64() | Large-file support | libc | Yes | No | Yes | Yes |
| fsetpos() | ANSI, POSIX 1003.1 | libc | Yes | No | Yes | Yes |
| fstat() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| fstat64() | Large-file support | libc | No | No | Yes | Yes |
| fstatat() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| fstatat64() | Large-file support | libc | No | No | Yes | Yes |
| fstatvfs() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| fstatvfs64() | Large-file support | libc | No | No | Yes | Yes |
| fsync() | POSIX 1003.1 FSC | libc | Yes | No | Yes | Yes |
| ftell() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| ftello() | POSIX 1003.1 | libc | Yes | No | No | Yes |
| ftello64() | Large-file support | libc | Yes | No | No | Yes |
| ftime() | Standard Unix; removed from POSIX.1-2008 | libc | No | No | Yes | Yes |
| ftruncate() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| ftruncate64() | Large-file support | libc | No | No | Yes | Yes |
| ftrylockfile() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| ftw() | POSIX 1003.1 OB XSI | libc | Yes | No | Yes | Yes |
| ftw64() | Large-file support | libc | Yes | No | Yes | Yes |
| funlockfile() | POSIX 1003.1 | libc | No | No | No | Yes |
| futime() | Unix | libc | No | No | Yes | Yes |
| futimens() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| fwide() | ANSI, POSIX 1003.1 | libc | No | No | Yes | Yes |
| fwprintf() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fwrite() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
| fwscanf() | ANSI, POSIX 1003.1 | libc | Yes | No | No | Yes |
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