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Return the value of a configurable limit associated with a file
#include <unistd.h>
long fpathconf( int filedes,
int name );
- filedes
- A file descriptor for the file whose limit you want to check.
- name
- The name of the configurable limit; see below.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The fpathconf() function returns a value of a configurable limit
indicated by name that's associated with the file
indicated by filedes.
Configurable limits are defined in <confname.h>, and include
at least the following values:
- _PC_LINK_MAX
- Maximum value of a file's link count.
- _PC_MAX_CANON
- Maximum number of bytes in a terminal's canonical input buffer
(edit buffer).
- _PC_MAX_INPUT
- Maximum number of bytes in a terminal's raw input buffer.
- _PC_NAME_MAX
- Maximum number of bytes in a file name (not including the terminating
null).
- _PC_PATH_MAX
- Maximum number of bytes in a pathname (not including the terminating
null).
- _PC_PIPE_BUF
- Maximum number of bytes that can be written atomically when writing to
a pipe.
- _PC_CHOWN_RESTRICTED
- If defined (not -1), indicates that the use of the chown()
function is restricted to a process with appropriate privileges, and to
changing the group ID of a file to the effective group ID of the
process or to one of its supplementary group IDs.
- _PC_NO_TRUNC
- If defined (not -1), indicates that the use of pathname components
longer than the value given by _PC_NAME_MAX
generates an error.
- _PC_VDISABLE
- If defined (not -1), this is the character value that can be used to
individually disable special control characters in the
termios
control structure.
The requested configurable limit, or -1 if an error occurred
(errno is set).
- EINVAL
- The name argument is invalid, or the indicated limit isn't
supported for this filedes.
- EBADF
- The argument filedes is invalid.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main()
{
long value;
value = fpathconf( 0, _PC_MAX_INPUT );
printf( "Input buffer size is %ld bytes\n",
value );
return EXIT_SUCCESS;
}
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
confstr(),
pathconf(),
sysconf(),
termios
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