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FD(4) FreeBSD Kernel Interfaces Manual FD(4)
NAME fd, stdin, stdout, stderr - file descriptor files
DESCRIPTION The files /dev/fd/0 through /dev/fd/# refer to file descriptors which can be accessed through the file system. If the file descriptor is open and the mode the file is being opened with is a subset of the mode of the existing descriptor, the call:
fd = open("/dev/fd/0", mode);
and the call:
fd = fcntl(0, F_DUPFD, 0);
are equivalent.
Opening the files /dev/stdin, /dev/stdout and /dev/stderr is equivalent to the following calls:
fd = fcntl(STDIN_FILENO, F_DUPFD, 0); fd = fcntl(STDOUT_FILENO, F_DUPFD, 0); fd = fcntl(STDERR_FILENO, F_DUPFD, 0);
Flags to the open(2) call other than O_RDONLY, O_WRONLY and O_RDWR are ignored.
IMPLEMENTATION NOTES By default, /dev/fd is provided by devfs(5), which provides nodes for the first three file descriptors. Some sites may require nodes for additional file descriptors; these can be made available by mounting fdescfs(5) on /dev/fd.
FILES /dev/fd/# /dev/stdin /dev/stdout /dev/stderr
SEE ALSO tty(4), devfs(5), fdescfs(5)
FreeBSD 14.0-RELEASE-p11 June 9, 1993 FreeBSD 14.0-RELEASE-p11