isfdtype(3)

1isfdtype(3)                Library Functions Manual                isfdtype(3)
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NAME

6       isfdtype - test file type of a file descriptor
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <sys/stat.h>
13       #include <sys/socket.h>
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15       int isfdtype(int fd, int fdtype);
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       isfdtype():
20           Since glibc 2.20:
21               _DEFAULT_SOURCE
22           Before glibc 2.20:
23               _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

26       The  isfdtype() function tests whether the file descriptor fd refers to
27       a file of type fdtype.  The fdtype argument specifies one of the  S_IF*
28       constants  defined  in  <sys/stat.h>  and  documented in stat(2) (e.g.,
29       S_IFREG).
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RETURN VALUE

32       The isfdtype() function returns 1 if the file descriptor fd is of  type
33       fdtype and 0 if it is not.  On failure, -1 is returned and errno is set
34       to indicate the error.
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ERRORS

37       The isfdtype() function can fail with any of the  same  errors  as  fs‐
38       tat(2).
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VERSIONS

41       Portable applications should use fstat(2) instead.
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STANDARDS

44       None.
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HISTORY

47       It  appeared  in the draft POSIX.1g standard.  It is present on OpenBSD
48       and Tru64 UNIX (where the required header file in both  cases  is  just
49       <sys/stat.h>, as shown in the POSIX.1g draft).
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