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Standard C Library: (libc.so, libc.a)
#include <sys/stat.h>
int isfdtype (
int filedes,
int fd_type);
The isfdtype function supports POSIX.1g Draft 6.6.
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Specifies the file descriptor to be tested. Specifies the file type to test for. Valid file types are defined in the <sys/mode.h> include file.
The isfdtype() function tests whether a file descriptor has a specific file type.
Upon successful completion, the isfdtype() function returns a 1 if the file descriptor has the specific file type or a 0 (zero) if it does not. If the isfdtype() function fails, a value of -1 is returned and errno is set to indicate the error.
If the isfdtype() function fails, errno may be set to the following value: The filedes parameter is not a valid file descriptor.
Functions: socket(2), stat(2), isatty(3).
Standards: standards(5). delim off