sem_open(3) - Linux manual page - Michael Kerrisk - man7 SEM_OPEN(3) Linux Programmer's Manual SEM_OPEN(3) NAME top sem_open - initialize and open a named semaphore SYNOPSIS top #include <fcntl sem_open() creates a new POSIX semaphore or opens an existing semaphore. The semaphore is identified by name. sem_open - Linux manual page - Michael Kerrisk This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME top sem_open — initialize and sem_open(3): initialize/open named semaphore - Linux man page sem_open() creates a new POSIX semaphore or opens an existing semaphore semaphore is identified by name details of the construction of name, see sem_overview(7). The oflag argument specifies flags that control the operation of the call. (Definitions of the flags values can be obtained by including <fcntl.h>.)If O_CREAT is specified in oflag, then the semaphore is created if it does sem_open(3) [centos man page] - Unix sem_open() creates a new POSIX semaphore or opens an existing semaphore. The semaphore is identified by name. For details of the con- struction of name, see sem_overview(7). The oflag argument specifies flags that control the oper sem_open(3) - OpenBSD manual pages The sem_open() function opens and returns a named semaphore. The sem_close () function closes a previously opened named semaphore without removing it. The sem_unlink () function removes the named semaphore from the system without closing it. Linux Documentation Linux Documentation. Search all of the Linux documentation available on this site: Semaphores (The GNU C Library) 27.1 Semaphores. The GNU C Library implements the semaphore APIs as defined in POSIX and System V. Semaphores can be used by multiple processes to coordinate shared resources. sem_overview: overview of POSIX semaphores - Linux Man Linux Manual Pages » Session 7. sem_overview (7) - Linux Man Pages. sem_overview: overview of POSIX semaphores. Two processes can operate on the same named semaphore by passing the same name to sem_open(3). The sem_open(3) function creates a new named semaphore or opens an existing named semaphore. sem_open()--Open Named Semaphore - IBM If sem_open() is called multiple times within the same process using the same name, sem_open() will return a pointer to the same semaphore, as long as another process has not used sem_unlink() to unlink the semaphore. If sem_open() is called from a program using data model LLP64, the returned semaphore pointer must be declared as a sem_t *__ptr128. sem_unlink(3) [minix man page] SEM_UNLINK(3) Linux Programmer's Manual SEM_UNLINK(3) NAME sem_unlink - remove a named semaphore SYNOPSIS #include <semaphore.h> int sem_unlink(const char *name); Link with -pthread. DESCRIPTION sem_unlink() removes the named semaphore referred to by name. The semaphore name is removed immediately.