letter 'e', which causes the close-on-exec flag (FD_CLOEXEC) to be set on the underlying file descriptor; see the description of the O_CLOEXEC flag in open(2)for reasons why this may be useful. The return value from popen() is a normal standard I/O stream in all respects save that it must be closed with pclose() rather than

There is no 100% guaranteed reliable solution. We should: - set the close-on-exec flag on the parent end of pipe file descriptors created by Runtime.exec() This will probably make the specific reported bug just go away. - close all file descriptors using the /proc//fd method. File descriptors open in the existing process image remain open in the new process image, unless they have the FD_CLOEXEC (close-on-exec) flag set. The files that remain open inherit all attributes of the open file descriptors from the existing process image, including file locks. To do that, we mark all file 22 // descriptors close-on-exec and then, in the child, explicitly 23 // unmark the ones we want the exec'ed program to keep. 24 // Unix doesn't make this easy: there is, in general, no way to 25 // allocate a new file descriptor close-on-exec. 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. O_CLOEXEC (Since Linux 2.6.23) Enable the close-on-exec flag for the new file descriptor. Specifying this flag permits a program to avoid additional fcntl (2) F_SETFD operations to set the FD_CLOEXEC flag. On systems that support a close-on-exec flag on files, the flag will be set for the newly opened file descriptor as determined by the value of $^F . See $^F in perlvar. Closing any piped filehandle causes the parent process to wait for the child to finish, then returns the status value in $? and ${^CHILD_ERROR_NATIVE} .

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.

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).

Ruby sets close-on-exec flags of all file descriptors by default since Ruby 2.0.0. So you don't need to set by yourself. Also, unsetting a close-on-exec flag can cause file descriptor leak if another thread use fork() and exec() (via system() method for example).

Clean up close-on-exec, particularly with jobserver pipes. [SV 13651] Handle out-of-memory conditions slightly more gracefully. Rename output_tmpfile() to a misc function get_tmpfile() * po/LINGUAS: Add support for traditional Chinese (zh_TW) * NEWS: Do not insert a space during '+=' if the value is empty. Flowdock - Team Inbox With Chat. Flowdock is a collaboration tool for technical teams. Version control, project management, deployments and your group chat in one place. Ruby sets close-on-exec flags of all file descriptors by default since Ruby 2.0.0. So you don't need to set by yourself. Also, unsetting a close-on-exec flag can cause file descriptor leak if another thread use fork() and exec() (via system() method for example). The program invoked inherits the calling process’s PID, and any open file descriptors that are not set to close-on-exec. Signals pending on the calling process are cleared. Any signals set to be caught by the calling process are reset to their default behaviour. The SIGCHLD signal (when set to SIG_IGN) may or may not be reset to SIG_DFL. The caller can force the close-on-exec flag to be set for the new file descriptor by specifying O_CLOEXECin flags. the same flag in open(2)for reasons why this may be useful. If oldfdequals newfd, then dup3() fails with the error EINVAL. Assigns the value of the Argument parameter to the close-on-exec flag (FD_CLOEXEC bit) that is associated with the FileDescriptor parameter. If the FD_CLOEXEC flag value is 0, the file remains open across any calls to exec subroutines; otherwise, the file will close upon the successful execution of an exec subroutine. F_GETFL 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.