#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <stdbool.h>

#include "ioexact.h"

extern volatile sig_atomic_t sigint;

ssize_t read_exact(int fd, void *buf, size_t len, bool mayexit)
{
	ssize_t num = 0, written;

	while (len > 0 && !sigint) {
		if ((written = read(fd, buf, len)) < 0) {
			if (errno == EAGAIN && num > 0)
				continue;
			if (mayexit)
				return -1;
			else
				continue;
		}
		if (!written)
			return 0;

		len -= written;
		buf += written;
		num += written;
	}

	return num;
}

ssize_t write_exact(int fd, void *buf, size_t len, bool mayexit)
{
	ssize_t num = 0, written;

	while (len > 0 && !sigint) {
		if ((written = write(fd, buf, len)) < 0) {
			if (errno == EAGAIN && num > 0)
				continue;
			if (mayexit)
				return -1;
			else
				continue;
		}
		if (!written)
			return 0;

		len -= written;
		buf += written;
		num += written;
	}

	return num;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=05e0be7c900797e9164976a6014d534ce3035909'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=05e0be7c900797e9164976a6014d534ce3035909'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=05e0be7c900797e9164976a6014d534ce3035909'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host?id=05e0be7c900797e9164976a6014d534ce3035909'>host</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/xhci-plat.c?id=05e0be7c900797e9164976a6014d534ce3035909'>xhci-plat.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='05e0be7c900797e9164976a6014d534ce3035909'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Christophe JAILLET &lt;christophe.jaillet@wanadoo.fr&gt;</td><td class='right'>2017-01-31 00:47:30 -0800</td></tr>
<tr><th>committer</th><td>Dmitry Torokhov &lt;dmitry.torokhov@gmail.com&gt;</td><td class='right'>2017-01-31 00:51:06 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/xhci-plat.c?id=05e0be7c900797e9164976a6014d534ce3035909'>05e0be7c900797e9164976a6014d534ce3035909</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/host/xhci-plat.c?id=05e0be7c900797e9164976a6014d534ce3035909'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=05e0be7c900797e9164976a6014d534ce3035909'>6064ddf732b21c686c958cb9da73f6eae6de5a27</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/host/xhci-plat.c?id=05e0be7c900797e9164976a6014d534ce3035909'>drivers/usb/host/xhci-plat.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/xhci-plat.c?id=3f5c34c6d4688b3b7e1dbc7bbc68a2f03a0d6b0c'>3f5c34c6d4688b3b7e1dbc7bbc68a2f03a0d6b0c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host/xhci-plat.c?id=05e0be7c900797e9164976a6014d534ce3035909&amp;id2=3f5c34c6d4688b3b7e1dbc7bbc68a2f03a0d6b0c'>diff</a>)</td></tr></table>
<div class='commit-subject'>Input: synaptics-rmi4 - fix reversed conditions in enable/disable_irq_wake</div><div class='commit-msg'>These tests are reversed.  A warning should be displayed if an error is
returned, not on success.

Signed-off-by: Christophe JAILLET &lt;christophe.jaillet@wanadoo.fr&gt;
Reviewed-by: Benjamin Tissoires &lt;benjamin.tissoires@redhat.com&gt;
Signed-off-by: Dmitry Torokhov &lt;dmitry.torokhov@gmail.com&gt;</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=05e0be7c900797e9164976a6014d534ce3035909'>Diffstat</a> (limited to 'drivers/usb/host/xhci-plat.c')</div><table summary='diffstat' class='diffstat'>