Guardian Native C Library Calls Reference Manual (G06.28+, H06.05+)

fgetc(3) Guardian Native C Library Calls Reference Manual
NAME
fgetc - Gets a character from a specified input stream
LIBRARY
G-series native Guardian processes: $SYSTEM.SYSnn.ZCRTLSRL
G-series native OSS processes: /G/system/sysnn/zcrtlsrl
H-series native Guardian processes: $SYSTEM.ZDLLnnn.ZCRTLDLL
H-series OSS processes: /G/system/zdllnnn/zcrtldll
SYNOPSIS
#include <stdio.h>
int fgetc(
FILE *stream);
PARAMETERS
stream Points to the file structure of an open file.
DESCRIPTION
The fgetc() function returns the next byte from the input specified by the stream parameter and
moves the file pointer, if defined, ahead one byte in stream.
NOTES
The fgetc() function is never a macro.
RETURN VALUES
This function returns a character if successful. It returns the integer constant EOF at the end of
the file or upon an error. The function sets errno when an error is encountered.
ERRORS
If any of the following conditions occur, the fgetc() function sets errno to the corresponding
value:
[EAGAIN] The O_NONBLOCK flag is set for the underlying input stream and the process
would be delayed by the read operation.
[EBADF] The file descriptor underlying the input stream is not a valid file descriptor or is
not open for reading.
[EINTR] The read operation was interrupted by a signal which was caught and no data
was transferred.
[ENXIO] A request was made on a nonexistent device, or the request was outside the
capabilities of the device.
[EIO] The call is attempting to read from the process’s controlling terminal and either
the process is ignoring or blocking the SIGTTIN signal or the process group is
orphaned.
[ENOMEM] Insufficient memory is available for the operation.
[EOVERFLOW]
The call is attempting to read a file at or beyond the maximum file offset. |
Any error encountered during the underlying call to the read() function can cause this function
to return the corresponding errno value reported by the read() function. If your application pro-
gram encounters an errno value not listed above, refer to the read(2) reference page either
online or in the Open System Services System Calls Reference Manual for information about the
cause of that error.
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