...he man page. For further information on feature test macros, see feature_test_macros (7). STANDARDS Certain terms and abbreviations are used to indicate UNIX variants and standa…...ess 0, and always returns -1 for a user process. ERRORS EPERM Always, for a user process. STANDARDS Linux. HISTORY Removed in Linux 2.3.13....ce NS_GET_OWNER_UID (2const) ERRORS ENOTTY fd does not refer to a /proc/ pid /ns/ * file. STANDARDS Linux. SEE ALSO ioctl (2), fstat (2), proc (5), namespaces (7)...ame guarantees as fsync () called on every file in the system or filesystem respectively. STANDARDS sync () POSIX.1-2008. syncfs () Linux. HISTORY sync () POSIX.1-2001, SVr4, 4.…...ame guarantees as fsync () called on every file in the system or filesystem respectively. STANDARDS sync () POSIX.1-2008. syncfs () Linux. HISTORY sync () POSIX.1-2001, SVr4, 4.…...et to EINTR . ERRORS EINTR a signal was caught and the signal-catching function returned. STANDARDS POSIX.1-2008. HISTORY POSIX.1-2001, SVr4, 4.3BSD. SEE ALSO kill (2), select (…...r an explanation of how this system call operates, see the description of mq_setattr (3). STANDARDS None. NOTES Never call it unless you are writing a C library! SEE ALSO mq_get…...ads in the calling process's thread group. RETURN VALUE This system call does not return. STANDARDS Linux. HISTORY Linux 2.5.35. NOTES Since glibc 2.3, this is the system call i…...E setup () always returns -1 for a user process. ERRORS EPERM Always, for a user process. STANDARDS Linux. VERSIONS Removed in Linux 2.1.121. The calling sequence varied: at som…...insufficient privilege to call vhangup (); the CAP_SYS_TTY_CONFIG capability is required. STANDARDS Linux. SEE ALSO init (1), capabilities (7)...d, and errno is set to indicate the error. ERRORS EINVAL timerid is not a valid timer ID. STANDARDS POSIX.1-2008. HISTORY Linux 2.6. POSIX.1-2001. SEE ALSO clock_gettime (2), ti…...tive value is returned. On error, -1 is returned, and errno is set to indicate the error. STANDARDS Linux. SEE ALSO ioctl (2)...or. EINVAL The watch descriptor wd is not valid; or fd is not an inotify file descriptor. STANDARDS Linux. HISTORY Linux 2.6.13. SEE ALSO inotify_add_watch (2), inotify_init (2)…...section, see attributes (7). Interface Attribute Value mq_unlink () Thread safety MT-Safe STANDARDS POSIX.1-2008. HISTORY POSIX.1-2001. SEE ALSO mq_close (3), mq_getattr (3), mq…...or. ERRORS ENOTTY The file descriptor fd does not refer to an object in a FAT filesystem. STANDARDS Linux. SEE ALSO ioctl (2)...ons transparently deal with this. See syscall (2) for details regarding register mapping. STANDARDS POSIX.1-2008. HISTORY POSIX.1-2001, 4.3BSD. The original Linux getgid () and …...ons transparently deal with this. See syscall (2) for details regarding register mapping. STANDARDS POSIX.1-2008. HISTORY POSIX.1-2001, 4.3BSD. The original Linux getgid () and …...ons transparently deal with this. See syscall (2) for details regarding register mapping. STANDARDS POSIX.1-2008. HISTORY POSIX.1-2001, 4.3BSD. The original Linux getgid () and …...ons transparently deal with this. See syscall (2) for details regarding register mapping. STANDARDS POSIX.1-2008. HISTORY POSIX.1-2001, 4.3BSD. The original Linux getgid () and …...process has insufficient privilege. Under Linux, the CAP_SYS_TIME privilege is required. STANDARDS None. HISTORY SVr4. Starting with glibc 2.31, this function is no longer avail…