In fcntl(2) is initially disabled) the O_CLOEXEC flag, describedīelow, can be used to change this default. The file descriptor returned byĪ successful call will be the lowest-numbered file descriptor notīy default, the new file descriptor is set to remain open acrossĪn execve(2) (i.e., the FD_CLOEXEC file descriptor flag described Subsequent system calls ( read(2), write(2), lseek(2), fcntl(2),Įtc.) to refer to the open file. Nonnegative integer that is an index to an entry in the process's
The return value of open() is a file descriptor, a small, Is specified in flags) be created by open(). The specified file does not exist, it may optionally (if O_CREAT The open() system call opens the file specified by pathname. Int openat2(int dirfd, const char * pathname, const struct open_how * how, size_t size ) įeature Test Macro Requirements for glibc (see * Documented separately, in openat2(2): */ SYNOPSIS top #include int open(const char * pathname, int flags ) int open(const char * pathname, int flags, mode_t mode ) int creat(const char * pathname, mode_t mode ) int openat(int dirfd, const char * pathname, int flags ) int openat(int dirfd, const char * pathname, int flags, mode_t mode )
Open, openat, creat - open and possibly create a file OPEN(2) Linux Programmer's Manual OPEN(2) NAME top
