13.14 File Descriptor Flags. File descriptor flags are miscellaneous attributes of a file descriptor. These flags are associated with particular file descriptors, so that if you have created duplicate file descriptors from a single opening of a file, each descriptor has its own set of flags.
uWSGI Options¶. This is an automatically generated reference list of the uWSGI options. It is the same output you can get via the --help option.. This page is probably the worst way to understand uWSGI for newbies. Yes, close-on-exec flag should be configurable, as TCPServer.allow_reuse_address for example. I like the class attribute, something like TCPServer.close_on_exec, False by default, for example. -- "I realize this bugreport cannot fix 35 years of a bad design decision in linux." Well To create a file descriptor with the close-on-exec flag atomically set all one has to do is to add the O_CLOEXEC flag to the call. There is already a parameter which takes such flags. The next more complicated is the solution chosen to extend the socket() and socketcall() system calls. Fork and Exec. The fork system call in Unix creates a new process. The new process inherits various properties from its parent (Environmental variables, File descriptors, etc - see the manual page for details).
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disk hardware at this point.) The close-on-exec file descriptor flag can be used to ensure that a file descriptor is automatically closed upon a successful execve(2); see fcntl(2)for details. Multithreaded processes and close()It is probably unwise to close file descriptors while they may be in
To create a file descriptor with the close-on-exec flag atomically set all one has to do is to add the O_CLOEXEC flag to the call. There is already a parameter which takes such flags. The next more complicated is the solution chosen to extend the socket() and socketcall() system calls.
how to set close-on-exec by default. Ask Question Asked 10 years, 8 months ago. Active 6 years, 8 months ago. Viewed 19k times 18. 7. I'm implementing a library to The exec family of functions replaces the current running process with a new process. It can be used to run a C program by using another C program. Note that fds which close-on-exec flag is already set are closed regardless of :close_others option. So IO.pipe and spawn can be used as IO.popen. # similar to r = IO.popen(command) r, w = IO. pipe pid = spawn (command,:out => w) # r, w is closed in the child process. w. close:close is specified as a hash value to close a fd individually. The sm_close_on_exec function in conf.c in sendmail before 8.14.9 has arguments in the wrong order, and consequently skips setting expected FD_CLOEXEC flags, which allows local users to access unintended high-numbered file descriptors via a custom mail-delivery program. I'm going to call the original issue here fixed, since close_on_exec= and friends now exist and will usually do the right thing. I also have it set up to warn if a stream can't be set to cloexec, which will effect systems where reflection is locked down (stock Java 9, secured environments, etc) or where native IO doesn't work properly yet (secured environments, unsupported platforms, Windows). The close on exec flag is set by default for all new file descriptors. 37: This means file descriptors doesn't inherit to spawned process unless: 38: