Minor changes

This commit is contained in:
Michael Kerrisk 2006-03-15 10:27:09 +00:00
parent 123a769478
commit 2f11acf57e
1 changed files with 10 additions and 7 deletions

View File

@ -197,25 +197,25 @@ The time structures involved are defined in
.I <sys/time.h>
and look like
.RS
.in +0.25i
.nf
struct timeval {
long tv_sec; /* seconds */
long tv_usec; /* microseconds */
};
.fi
.RE
.in -0.25i
and
.RS
.in +0.25i
.nf
struct timespec {
long tv_sec; /* seconds */
long tv_nsec; /* nanoseconds */
};
.fi
.RE
.in -0.25i
(However, see below on the POSIX 1003.1-2001 versions.)
.PP
@ -389,8 +389,10 @@ was emulated in glibc (but see BUGS).
.SH "LINUX NOTES"
The Linux
.BR pselect ()
system call modifies its timeout argument.
However, the glibc wrapper functions hides this behaviour
system call modifies its
.I timeout
argument.
However, the glibc wrapper function hides this behaviour
by using a local variable for the timeout argument that
is passed to the system call.
Thus, the glibc
@ -427,7 +429,8 @@ Under Linux,
may report a socket file descriptor as "ready for reading", while
nevertheless a subsequent read blocks. This could for example
happen when data has arrived but upon examination has wrong
checksum and is discarded. There may be other circumstances.
checksum and is discarded. There may be other circumstances
in which a file descriptor is spuriously reported as ready.
.\" Stevens discusses a case where accept can block after select
.\" returns successfully because of an intervening RST from the client.
Thus it may be safer to use O_NONBLOCK on sockets that should not block.