1fd(4)                            File Formats                            fd(4)
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NAME

6       fd - file descriptor files
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DESCRIPTION

9       These  files,  conventionally  called  /dev/fd/0, /dev/fd/1, /dev/fd/2,
10       and so on, refer to files accessible through file descriptors. If  file
11       descriptor  n is open, these two system calls have the same effect:
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13         fd = open("/dev/fd/n",mode);
14         fd = dup(n);
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19       On these files  creat(2) is equivalent to open, and mode is ignored. As
20       with  dup, subsequent reads or writes on  fd fail unless  the  original
21       file descriptor allows the operations.
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24       For  convenience  in  referring to standard input, standard output, and
25       standard error, an additional set of names is provided:  /dev/stdin  is
26       a  synonym  for   /dev/fd/0, /dev/stdout for /dev/fd/1, and /dev/stderr
27       for  /dev/fd/2.
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SEE ALSO

30       creat(2), dup(2), open(2)
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DIAGNOSTICS

33       open(2) returns −1 and  EBADF if the associated file descriptor is  not
34       open.
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38SunOS 5.11                        3 Jul 1990                             fd(4)