#include <linux/compiler.h>
#include <linux/kernel.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>

#include "data.h"
#include "util.h"
#include "debug.h"

static bool check_pipe(struct perf_data_file *file)
{
	struct stat st;
	bool is_pipe = false;
	int fd = perf_data_file__is_read(file) ?
		 STDIN_FILENO : STDOUT_FILENO;

	if (!file->path) {
		if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
			is_pipe = true;
	} else {
		if (!strcmp(file->path, "-"))
			is_pipe = true;
	}

	if (is_pipe)
		file->fd = fd;

	return file->is_pipe = is_pipe;
}

static int check_backup(struct perf_data_file *file)
{
	struct stat st;

	if (!stat(file->path, &st) && st.st_size) {
		/* TODO check errors properly */
		char oldname[PATH_MAX];
		snprintf(oldname, sizeof(oldname), "%s.old",
			 file->path);
		unlink(oldname);
		rename(file->path, oldname);
	}

	return 0;
}

static int open_file_read(struct perf_data_file *file)
{
	struct stat st;
	int fd;
	char sbuf[STRERR_BUFSIZE];

	fd = open(file->path, O_RDONLY);
	if (fd < 0) {
		int err = errno;

		pr_err("failed to open %s: %s", file->path,
			str_error_r(err, sbuf, sizeof(sbuf)));
		if (err == ENOENT && !strcmp(file->path, "perf.data"))
			pr_err("  (try 'perf record' first)");
		pr_err("\n");
		return -err;
	}

	if (fstat(fd, &st) < 0)
		goto out_close;

	if (!file->force && st.st_uid && (st.st_uid != geteuid())) {
		pr_err("File %s not owned by current user or root (use -f to override)\n",
		       file->path);
		goto out_close;
	}

	if (!st.st_size) {
		pr_info("zero-sized file (%s), nothing to do!\n",
			file->path);
		goto out_close;
	}

	file->size = st.st_size;
	return fd;

 out_close:
	close(fd);
	return -1;
}

static int open_file_write(struct perf_data_file *file)
{
	int fd;
	char sbuf[STRERR_BUFSIZE];

	if (check_backup(file))
		return -1;

	fd = open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);

	if (fd < 0)
		pr_err("failed to open %s : %s\n", file->path,
			str_error_r(errno, sbuf, sizeof(sbuf)));

	return fd;
}

static int open_file(struct perf_data_file *file)
{
	int fd;

	fd = perf_data_file__is_read(file) ?
	     open_file_read(file) : open_file_write(file);

	file->fd = fd;
	return fd < 0 ? -1 : 0;
}

int perf_data_file__open(struct perf_data_file *file)
{
	if (check_pipe(file))
		return 0;

	if (!file->path)
		file->path = "perf.data";

	return open_file(file);
}

void perf_data_file__close(struct perf_data_file *file)
{
	close(file->fd);
}

ssize_t perf_data_file__write(struct perf_data_file *file,
			      void *buf, size_t size)
{
	return writen(file->fd, buf, size);
}

int perf_data_file__switch(struct perf_data_file *file,
			   const char *postfix,
			   size_t pos, bool at_exit)
{
	char *new_filepath;
	int ret;

	if (check_pipe(file))
		return -EINVAL;
	if (perf_data_file__is_read(file))
		return -EINVAL;

	if (asprintf(&new_filepath, "%s.%s", file->path, postfix) < 0)
		return -ENOMEM;

	/*
	 * Only fire a warning, don't return error, continue fill
	 * original file.
	 */
	if (rename(file->path, new_filepath))
		pr_warning("Failed to rename %s to %s\n", file->path, new_filepath);

	if (!at_exit) {
		close(file->fd);
		ret = perf_data_file__open(file);
		if (ret < 0)
			goto out;

		if (lseek(file->fd, pos, SEEK_SET) == (off_t)-1) {
			ret = -errno;
			pr_debug("Failed to lseek to %zu: %s",
				 pos, strerror(errno));
			goto out;
		}
	}
	ret = file->fd;
out:
	free(new_filepath);
	return ret;
}
=0becc0ae5b42828785b589f686725ff5bc3b9b25'>feature</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/build/feature/test-libperl.c?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>test-libperl.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='0becc0ae5b42828785b589f686725ff5bc3b9b25'/><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>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 09:37:34 +0100</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 21:47:58 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/build/feature/test-libperl.c?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>0becc0ae5b42828785b589f686725ff5bc3b9b25</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/build/feature/test-libperl.c?id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>be6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/build/feature/test-libperl.c?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>tools/build/feature/test-libperl.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/build/feature/test-libperl.c?h=nds-private-remove&amp;id=24c2503255d35c269b67162c397a1a1c1e02f6ce'>24c2503255d35c269b67162c397a1a1c1e02f6ce</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/build/feature/test-libperl.c?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25&amp;id2=24c2503255d35c269b67162c397a1a1c1e02f6ce'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/mce: Make timer handling more robust</div><div class='commit-msg'>Erik reported that on a preproduction hardware a CMCI storm triggers the
BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is
started by the CMCI logic before the MCE CPU hotplug callback starts the
timer with add_timer_on(). So the timer is already queued which triggers
the BUG.

Using add_timer_on() is pretty pointless in this code because the timer is
strictlty per CPU, initialized as pinned and all operations which arm the
timer happen on the CPU to which the timer belongs.

Simplify the whole machinery by using mod_timer() instead of add_timer_on()
which avoids the problem because mod_timer() can handle already queued
timers. Use __start_timer() everywhere so the earliest armed expiry time is
preserved.

Reported-by: Erik Veijola &lt;erik.veijola@intel.com&gt;
Tested-by: Borislav Petkov &lt;bp@alien8.de&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Reviewed-by: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Tony Luck &lt;tony.luck@intel.com&gt;
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=0becc0ae5b42828785b589f686725ff5bc3b9b25'>Diffstat</a> (limited to 'tools/build/feature/test-libperl.c')</div><table summary='diffstat' class='diffstat'>