X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/mLib/blobdiff_plain/8f45ff6cb9a269fc6f8f631908f93b4c8123419c..4aee39a18184ae8595936a03ad254c27d149a0eb:/man/fdflags.3

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-.\" -*-nroff-*-
-.de VS
-.sp 1
-.RS
-.nf
-.ft B
-..
-.de VE
-.ft R
-.fi
-.RE
-.sp 1
-..
-.TH fdflags 3 "23 July 1999" "Straylight/Edgeware" "mLib utilities library"
-.SH "NAME"
-fdflags \- set file and file descriptor flags
-.\" @fdflags
-.SH "SYNOPSIS"
-.nf
-.B "#include <mLib/fdflags.h>"
-
-.BI "int fdflags(int " fd ,
-.BI "            unsigned " fbic ", unsigned " fxor ,
-.BI "            unsigned " fdbic ", unsigned " fdxor );
-.fi
-.SH "DESCRIPTION"
-.B fdflags
-is a convenience function for setting file and file descriptor flags
-using
-.BR fcntl (2).
-.PP
-The file flags are read using
-.BR F_GETFL ,
-the new flags are calculated as
-.sp 1
-.RS
-.I new-flags
-=
-.BI ( old-flags
-.B &
-.BI ~ fbic )
-.B ^
-.I fxor
-.RE
-.sp 1
-and the result written back using
-.BR F_SETFL .
-.PP
-Similarly the file descriptor flags are read using
-.BR F_GETFD ,
-the new flags calculated as
-.sp 1
-.RS
-.I new-flags
-=
-.BI ( old-flags
-.B &
-.BI ~ fdbic )
-.B ^
-.I fdxor
-.RE
-.sp 1
-and the result written back using
-.BR F_SETFD .
-.PP
-If all went well,
-.B fdflags
-returns zero; if there was an error, \-1 is returned.
-.SH "EXAMPLES"
-To set the non-blocking and close-on-exec flags:
-.VS
-fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
-.VE
-To clear the non-blocking and close-on-exec flags:
-.VS
-fdflags(fd, O_NONBLOCK, 0, FD_CLOEXEC, 0);
-.VE
-.sp -1
-.SH "SEE ALSO"
-.BR mLib (3).
-.SH "AUTHOR"
-Mark Wooding, <mdw@distorted.org.uk>