In this guide, we will describe some of the possible causes that can cause the dup2 error, and then we will point out some ways in which you can try to fix the problem.
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RETURN COST If successful, dup2 () returns a non-negative integer; a duplicate file descriptor to be precise, which is usually the smallest available file descriptor. If that fails, it falls back to -1 and sets errno to the appropriate value.
dup (2) Linux DUP (2) Programming Guide
dup, dup2, dup3 – duplicate image descriptor
#include int oldfd); dup (int int dup2 (int oldfd, int newfd); #define _GNU_SOURCE / * See feature_test_macros (7) * / #include / * define most O_ constants * * / #include int dup3 (indicators int oldfd, int newfd, int);
The dup () system dialog assigns a new descriptor file that has as the same open file description as this particular oldfd descriptor. (TO For an explanation of descriptions of open files, see Open (2). The descriptor number is guaranteed to be the smallest our music file descriptor that was not used when dialing the number. After a successful rollback, the old and new file descriptor can be used interchangeably. Since the two file descriptors after some of the same open file description, they manually separate file offset and file Status indicators; for example if the file offset is changed toIf you choose lseek (2) for one of the file descriptors, each offset will also be changed to a different manual write descriptor. Two file descriptors do not speak of file descriptors ( Flags close-on-exec flag). Close flag on execution (FD_CLOEXEC; see. fcntl (2)) is disabled for the retail copy handle. dup2 () The dup2 () system call does the same job as dup (), but Instead of using the smallest junk file descriptor, makes full use of the file descriptor specified in newfd. In others Words, I would say that the file descriptor newfd is now set to work to refer to the same open database description as oldfd. If the file descriptor newfd was opened earlier, it will be closed before reuse; business is conducted quietly (that is, everything Dup2 () does not document any misses during inference. Steps to close and use a file descriptor – newfd Works atomically. This is important because trying will implement very similar functionality with close (2) and dup () Be disciplined about race conditions,which could lead to reuse of newfd. at both stages. Such sales income could arise due to the fact that the main thing – The program ends with a signal handler that allocates a huge file Descriptor, or because the parallel line is linking the file Description. Please note the following: * If oldfd is not a valid declaration descriptor, the call will fail, but newfd doesn’t close either. * If oldfd is a valid file descriptor and therefore newfd has the same value because oldfd, then dup2 () does nothing and falls back to newfd. dup3 () dup3 () is as specific as dup2 () except that: * Unknown caller can force close-on-exec flag to a new directory descriptor by specifying O_CLOEXEC in flags. To see Description of the same flag currently open (2) for reasons you should might be helpful. 6. If oldfd is equal to newfd, then dup3 () stops with an error. EINVAL.
If successful, this systemicreturning calls a new file descriptor. -1 returns an error and simply sets errno to indicate any errors.
EBADF oldfd is not an open file descriptor. EBADF newfd goes beyond file descriptors (See the discussion of RLIMIT_NOFILE in Getrlimit (2)). EBUSY (Linux only) This could be returned by dup2 () or maybe even dup3 () for an open (2) race condition using with dup (). EINTR The call to dup2 () or dup3 () was interrupted by a signal; see Signal (7). The red flags EINVAL (dup3 ()) contain an invalid value. EINVAL (dup3 ()) oldfd was originally newfd. EMFILE Limit on the number of open files for each process. The descriptors are mostly reached (see discussion RLIMIT_NOFILE in Getrlimit (2)).
dup3 () was considered to be added to Linux in the 2.6.27 adaptation; glibc support is Available from selection 2.9.
dup (), dup2 (): POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD. dup3 () is definitely Linux specific.
The error returned by dup2 () is an alternative to error fcntl (…, F_DUPFD, …) newfd if out of range. Several Sometimes dup2 () systems also return EINVAL as F_DUPFD. If newfd was open, all problems that would have been reported below close (2) a period of time has been lost. If it bothers you, then – unless it is The program is single threaded and does not actually assign a file descriptor. in signal handlers – the handling approach is to not use newfd. close before bbb dup2 () because of the racial issue described Above. Instead, you can use code such as using: / * Get a duplicate of newfd, which may be possible later usually used to check for closing errors (); useful EBADF error means that ‘newfd’ was before it was opened. * / tmpfd implies dup (newfd); if (tmpfd == -1 && errno EBADF)! = / * Handle unexpected dup () error. * / / * Enabled atomic duplication ‘oldfd’ ‘newfd’. * / if (dup2 (oldfd, newfd) == -1) / * Dup2 () – handle errors. * / / * Now check to see if there are any closing () errors that were originally sent whendispatch introduced ‘newfd’. * / if (tmpfd! = -1) if (close (tmpfd) == -1) / * Handle closing errors. * /
close (2), fcntl (2), open (2), pidfd_getfd (2)
This page is an intentional part of the Linux 5.13 project man pages. One of the reasons for the project, coverage error information, and also the latest version of this page can be found at https://www.kernel.org/doc/man-pages/.
Pages related to such a page: bpf (2), fcntl (2), Herd (2), Getrlimit (2), kcmp (2), search (2), open (2), pidfd_getfd (2), System calls (2), fileno (3), getdtablesize (3), posix_spawn (3), epoll (7), Tube (7), Signal security (7), unix (7)
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The PC dup2 () function is used to generate a duplicate of an existing file descriptor. Linux has 3 standard file descriptors. This is: stdin: this is the file descriptor entered by ysilence.
The dup2 () function returns a descriptor with the value fildes2. The descriptor points to the same file as fildes and closes the initiator to which fildes2 was bound. If the original file descriptor was opened in text mode, data conversion will also complete on the duplicated file descriptor.
To do this, you explicitly call close ().The process will end and the operating system will be sure to close all open file descriptors.When a process calls one of these seven specific exec () functions and the information descriptor has the O_CLOEXEC flag.
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