76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
|
/*++
|
||
|
|
/* NAME
|
||
|
|
/* write_buf 3
|
||
|
|
/* SUMMARY
|
||
|
|
/* write buffer or bust
|
||
|
|
/* SYNOPSIS
|
||
|
|
/* #include <iostuff.h>
|
||
|
|
/*
|
||
|
|
/* int write_buf(fd, buf, len, timeout)
|
||
|
|
/* int fd;
|
||
|
|
/* const char *buf;
|
||
|
|
/* int len;
|
||
|
|
/* int timeout;
|
||
|
|
/* DESCRIPTION
|
||
|
|
/* write_buf() writes a buffer to the named stream in as many
|
||
|
|
/* fragments as needed, and returns the number of bytes written,
|
||
|
|
/* which is always the number requested or an error indication.
|
||
|
|
/*
|
||
|
|
/* Arguments:
|
||
|
|
/* .IP fd
|
||
|
|
/* File descriptor in the range 0..FD_SETSIZE.
|
||
|
|
/* .IP buf
|
||
|
|
/* Address of data to be written.
|
||
|
|
/* .IP len
|
||
|
|
/* Amount of data to be written.
|
||
|
|
/* .IP timeout
|
||
|
|
/* Bounds the time in seconds to wait until \fIfd\fD becomes writable.
|
||
|
|
/* A value <= 0 means do not wait; this is useful only when \fIfd\fR
|
||
|
|
/* uses blocking I/O.
|
||
|
|
/* DIAGNOSTICS
|
||
|
|
/* write_buf() returns -1 in case of trouble. The global \fIerrno\fR
|
||
|
|
/* variable reflects the nature of the problem.
|
||
|
|
/* LICENSE
|
||
|
|
/* .ad
|
||
|
|
/* .fi
|
||
|
|
/* The Secure Mailer license must be distributed with this software.
|
||
|
|
/* AUTHOR(S)
|
||
|
|
/* Wietse Venema
|
||
|
|
/* IBM T.J. Watson Research
|
||
|
|
/* P.O. Box 704
|
||
|
|
/* Yorktown Heights, NY 10598, USA
|
||
|
|
/*--*/
|
||
|
|
|
||
|
|
/* System library. */
|
||
|
|
|
||
|
|
#include <sys_defs.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
/* Utility library. */
|
||
|
|
|
||
|
|
#include <msg.h>
|
||
|
|
#include <iostuff.h>
|
||
|
|
|
||
|
|
/* write_buf - write buffer or bust */
|
||
|
|
|
||
|
|
int write_buf(int fd, const char *buf, int len, int timeout)
|
||
|
|
{
|
||
|
|
int count;
|
||
|
|
|
||
|
|
while (len > 0) {
|
||
|
|
if (timeout > 0 && write_wait(fd, timeout) < 0)
|
||
|
|
return (-1);
|
||
|
|
if ((count = write(fd, buf, len)) < 0) {
|
||
|
|
if (errno == EAGAIN && timeout > 0)
|
||
|
|
continue;
|
||
|
|
return (-1);
|
||
|
|
}
|
||
|
|
if (count == 0)
|
||
|
|
msg_fatal("write returned 0");
|
||
|
|
buf += count;
|
||
|
|
len -= count;
|
||
|
|
}
|
||
|
|
return (len);
|
||
|
|
}
|