blob: 0ac78526619720a80482d573a198f883c0eef045 [file] [log] [blame]
/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*
*/
/* $Id: zoolib.c,v 1.8 2009/06/09 17:59:46 subrata_modak Exp $ */
/*
* ZooLib
*
* A Zoo is a file used to record what test tags are running at the moment.
* If the system crashes, we should be able to look at the zoo file to find out
* what was currently running. This is especially helpful when running multiple
* tests at the same time.
*
* The zoo file is meant to be a text file that fits on a standard console.
* You should be able to watch it with `cat zoofile`
*
* zoo file format:
* 80 characters per line, ending with a \n
* available lines start with '#'
* expected line fromat: pid_t,tag,cmdline
*
*/
#include <signal.h>
#include <stdlib.h> /* for getenv */
#include <string.h>
#include "zoolib.h"
char zoo_error[ZELEN];
#ifdef __linux__
/* glibc2.2 definition needs -D_XOPEN_SOURCE, which breaks other things. */
extern int sighold(int __sig);
extern int sigrelse(int __sig);
#endif
/* zoo_mark(): private function to make an entry to the zoo
* returns 0 on success, -1 on error */
static int zoo_mark(zoo_t z, char *entry);
static int zoo_lock(zoo_t z);
static int zoo_unlock(zoo_t z);
/* cat_args(): helper function to make cmdline from argc, argv */
char *cat_args(int argc, char **argv);
/* zoo_getname(): create a filename to use for the zoo */
char *zoo_getname(void)
{
char buf[1024];
char *zoo;
zoo = getenv("ZOO");
if (zoo) {
snprintf(buf, 1024, "%s/%s", zoo, "active");
return strdup(buf);
} else {
/* if there is no environment variable, we don't know where to put it */
return NULL;
}
}
/* zoo_open(): open a zoo for use */
zoo_t zoo_open(char *zooname)
{
zoo_t new_zoo;
new_zoo = (zoo_t) fopen(zooname, "r+");
if (!new_zoo) {
if (errno == ENOENT) {
/* file doesn't exist, try fopen(xxx, "a+") */
new_zoo = (zoo_t) fopen(zooname, "a+");
if (!new_zoo) {
/* total failure */
snprintf(zoo_error, ZELEN,
"Could not open zoo as \"%s\", errno:%d %s",
zooname, errno, strerror(errno));
return 0;
}
fclose(new_zoo);
new_zoo = fopen(zooname, "r+");
} else {
snprintf(zoo_error, ZELEN,
"Could not open zoo as \"%s\", errno:%d %s",
zooname, errno, strerror(errno));
}
}
return new_zoo;
}
int zoo_close(zoo_t z)
{
int ret;
ret = fclose(z);
if (ret) {
snprintf(zoo_error, ZELEN,
"closing zoo caused error, errno:%d %s",
errno, strerror(errno));
}
return ret;
}
static int zoo_mark(zoo_t z, char *entry)
{
FILE *fp = (FILE *) z;
int found = 0;
long pos;
char buf[BUFLEN];
if (fp == NULL)
return -1;
if (zoo_lock(z))
return -1;
/* first fit */
rewind(fp);
do {
pos = ftell(fp);
if (fgets(buf, BUFLEN, fp) == NULL)
break;
if (buf[0] == '#') {
rewind(fp);
if (fseek(fp, pos, SEEK_SET)) {
/* error */
snprintf(zoo_error, ZELEN,
"seek error while writing to zoo file, errno:%d %s",
errno, strerror(errno));
return -1;
}
/* write the entry, left justified, and padded/truncated to the
* same size as the previous entry */
fprintf(fp, "%-*.*s\n", (int)strlen(buf) - 1,
(int)strlen(buf) - 1, entry);
found = 1;
break;
}
} while (1);
if (!found) {
if (fseek(fp, 0, SEEK_END)) {
snprintf(zoo_error, ZELEN,
"error seeking to end of zoo file, errno:%d %s",
errno, strerror(errno));
return -1;
}
fprintf(fp, "%-*.*s\n", 79, 79, entry);
}
fflush(fp);
if (zoo_unlock(z))
return -1;
return 0;
}
int zoo_mark_cmdline(zoo_t z, pid_t p, char *tag, char *cmdline)
{
char new_entry[BUFLEN];
snprintf(new_entry, 80, "%d,%s,%s", p, tag, cmdline);
return zoo_mark(z, new_entry);
}
int zoo_mark_args(zoo_t z, pid_t p, char *tag, int ac, char **av)
{
char *cmdline;
int ret;
cmdline = cat_args(ac, av);
ret = zoo_mark_cmdline(z, p, tag, cmdline);
free(cmdline);
return ret;
}
int zoo_clear(zoo_t z, pid_t p)
{
FILE *fp = (FILE *) z;
long pos;
char buf[BUFLEN];
pid_t that_pid;
int found = 0;
if (fp == NULL)
return -1;
if (zoo_lock(z))
return -1;
rewind(fp);
do {
pos = ftell(fp);
if (fgets(buf, BUFLEN, fp) == NULL)
break;
if (buf[0] == '#')
continue;
that_pid = atoi(buf);
if (that_pid == p) {
if (fseek(fp, pos, SEEK_SET)) {
/* error */
snprintf(zoo_error, ZELEN,
"seek error while writing to zoo file, errno:%d %s",
errno, strerror(errno));
return -1;
}
if (ftell(fp) != pos) {
printf("fseek failed\n");
}
fputs("#", fp);
found = 1;
break;
}
} while (1);
fflush(fp);
/* FIXME: unlock zoo file */
if (zoo_unlock(z))
return -1;
if (!found) {
snprintf(zoo_error, ZELEN,
"zoo_clear() did not find pid(%d)", p);
return 1;
}
return 0;
}
pid_t zoo_getpid(zoo_t z, char *tag)
{
FILE *fp = (FILE *) z;
char buf[BUFLEN], *s;
pid_t this_pid = -1;
if (fp == NULL)
return -1;
if (zoo_lock(z))
return -1;
rewind(fp);
do {
if (fgets(buf, BUFLEN, fp) == NULL)
break;
if (buf[0] == '#')
continue; /* recycled line */
if ((s = strchr(buf, ',')) == NULL)
continue; /* line was not expected format */
if (strncmp(s + 1, tag, strlen(tag)))
continue; /* tag does not match */
this_pid = atoi(buf);
break;
} while (1);
if (zoo_unlock(z))
return -1;
return this_pid;
}
int zoo_lock(zoo_t z)
{
FILE *fp = (FILE *) z;
struct flock zlock;
sigset_t block_these;
int ret;
if (fp == NULL)
return -1;
zlock.l_whence = zlock.l_start = zlock.l_len = 0;
zlock.l_type = F_WRLCK;
sigemptyset(&block_these);
sigaddset(&block_these, SIGINT);
sigaddset(&block_these, SIGTERM);
sigaddset(&block_these, SIGHUP);
sigaddset(&block_these, SIGUSR1);
sigaddset(&block_these, SIGUSR2);
sigprocmask(SIG_BLOCK, &block_these, NULL);
do {
ret = fcntl(fileno(fp), F_SETLKW, &zlock);
} while (ret == -1 && errno == EINTR);
sigprocmask(SIG_UNBLOCK, &block_these, NULL);
if (ret == -1) {
snprintf(zoo_error, ZELEN,
"failed to unlock zoo file, errno:%d %s",
errno, strerror(errno));
return -1;
}
return 0;
}
int zoo_unlock(zoo_t z)
{
FILE *fp = (FILE *) z;
struct flock zlock;
sigset_t block_these;
int ret;
if (fp == NULL)
return -1;
zlock.l_whence = zlock.l_start = zlock.l_len = 0;
zlock.l_type = F_UNLCK;
sigemptyset(&block_these);
sigaddset(&block_these, SIGINT);
sigaddset(&block_these, SIGTERM);
sigaddset(&block_these, SIGHUP);
sigaddset(&block_these, SIGUSR1);
sigaddset(&block_these, SIGUSR2);
sigprocmask(SIG_BLOCK, &block_these, NULL);
do {
ret = fcntl(fileno(fp), F_SETLKW, &zlock);
} while (ret == -1 && errno == EINTR);
sigprocmask(SIG_UNBLOCK, &block_these, NULL);
if (ret == -1) {
snprintf(zoo_error, ZELEN,
"failed to lock zoo file, errno:%d %s",
errno, strerror(errno));
return -1;
}
return 0;
}
char *cat_args(int argc, char **argv)
{
int a, size;
char *cmd;
for (size = a = 0; a < argc; a++) {
size += strlen(argv[a]);
size++;
}
if ((cmd = malloc(size)) == NULL) {
snprintf(zoo_error, ZELEN,
"Malloc Error, %s/%d", __FILE__, __LINE__);
return NULL;
}
*cmd = '\0';
for (a = 0; a < argc; a++) {
if (a != 0)
strcat(cmd, " ");
strcat(cmd, argv[a]);
}
return cmd;
}
#if defined(UNIT_TEST)
void zt_add(zoo_t z, int n)
{
char cmdline[200];
char tag[10];
snprintf(tag, 10, "%s%d", "test", n);
snprintf(cmdline, 200, "%s%d %s %s %s", "runtest", n, "one", "two",
"three");
zoo_mark_cmdline(z, n, tag, cmdline);
}
int main(int argc, char *argv[])
{
char *zooname;
zoo_t test_zoo;
char *test_tag = "unittest";
int i, j;
zooname = zoo_getname();
if (!zooname) {
zooname = strdup("test_zoo");
}
printf("Test zoo filename is %s\n", zooname);
if ((test_zoo = zoo_open(zooname)) == NULL) {
printf("Error opennning zoo\n");
exit(-1);
}
zoo_mark_args(test_zoo, getpid(), test_tag, argc, argv);
for (j = 0; j < 5; j++) {
for (i = 0; i < 20; i++) {
zt_add(test_zoo, i);
}
for (; i >= 0; i--) {
zoo_clear(test_zoo, i);
}
}
zoo_clear(test_zoo, getpid());
return 0;
}
#endif