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8a529bd987
curl/tests/libtest/lib537.c
Yang Tse 8a529bd987 test can be allowed to run if fopen() is capable of fopen()ing 
three additional files once that we have already open()ed the
big bunch of file descriptors.
2007-04-04 06:39:03 +00:00

484 lines
12 KiB
C
Raw Blame History

/*****************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* $Id$
*/
#include "test.h"
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#if !defined(HAVE_POLL_FINE) && \
!defined(USE_WINSOCK) && \
!defined(TPF) && \
!defined(FD_SETSIZE)
#error "this test requires FD_SETSIZE"
#endif
#define SAFETY_MARGIN (10)
#if defined(WIN32) || defined(_WIN32) || defined(MSDOS)
#define DEV_NULL "NUL"
#else
#define DEV_NULL "/dev/null"
#endif
#if defined(HAVE_GETRLIMIT) && defined(HAVE_SETRLIMIT)
static int *fd = NULL;
static struct rlimit num_open;
static char msgbuff[256];
static void store_errmsg(const char *msg, int err)
{
if (!err)
sprintf(msgbuff, "%s", msg);
else
sprintf(msgbuff, "%s, errno %d, %s", msg, err, strerror(err));
}
static void close_file_descriptors(void)
{
for (num_open.rlim_cur = 0;
num_open.rlim_cur < num_open.rlim_max;
num_open.rlim_cur++)
if (fd[num_open.rlim_cur] > 0)
close(fd[num_open.rlim_cur]);
free(fd);
fd = NULL;
}
static int fopen_works(void)
{
FILE *fpa[3];
int i;
int ret = 1;
for (i = 0; i < 3; i++) {
fpa[i] = NULL;
}
for (i = 0; i < 3; i++) {
fpa[i] = fopen(DEV_NULL, "r");
if (fpa[i] == NULL) {
ret = 0;
break;
}
}
for (i = 0; i < 3; i++) {
if (fpa[i] != NULL)
fclose(fpa[i]);
}
return ret;
}
static int rlimit(int keep_open)
{
int *tmpfd;
int nitems, i;
int *memchunk = NULL;
char *fmt;
struct rlimit rl;
char strbuff[256];
char strbuff1[81];
char fmt_u[] = "%u";
char fmt_lu[] = "%lu";
#ifdef HAVE_LONGLONG
char fmt_llu[] = "%llu";
if (sizeof(rl.rlim_max) > sizeof(long))
fmt = fmt_llu;
else
#endif
fmt = (sizeof(rl.rlim_max) < sizeof(long))?fmt_u:fmt_lu;
/* get initial open file limits */
if (getrlimit(RLIMIT_NOFILE, &rl) != 0) {
store_errmsg("getrlimit() failed", ERRNO);
fprintf(stderr, "%s\n", msgbuff);
return -1;
}
/* show initial open file limits */
#ifdef RLIM_INFINITY
if (rl.rlim_cur == RLIM_INFINITY)
strcpy(strbuff, "INFINITY");
else
#endif
sprintf(strbuff, fmt, rl.rlim_cur);
fprintf(stderr, "initial soft limit: %s\n", strbuff);
#ifdef RLIM_INFINITY
if (rl.rlim_max == RLIM_INFINITY)
strcpy(strbuff, "INFINITY");
else
#endif
sprintf(strbuff, fmt, rl.rlim_max);
fprintf(stderr, "initial hard limit: %s\n", strbuff);
/*
* if soft limit and hard limit are different we ask the
* system to raise soft limit all the way up to the hard
* limit. Due to some other system limit the soft limit
* might not be raised up to the hard limit. So from this
* point the resulting soft limit is our limit. Trying to
* open more than soft limit file descriptors will fail.
*/
if (rl.rlim_cur != rl.rlim_max) {
fprintf(stderr, "raising soft limit up to hard limit\n");
rl.rlim_cur = rl.rlim_max;
if (setrlimit(RLIMIT_NOFILE, &rl) != 0) {
store_errmsg("setrlimit() failed", ERRNO);
fprintf(stderr, "%s\n", msgbuff);
return -2;
}
/* get current open file limits */
if (getrlimit(RLIMIT_NOFILE, &rl) != 0) {
store_errmsg("getrlimit() failed", ERRNO);
fprintf(stderr, "%s\n", msgbuff);
return -3;
}
/* show current open file limits */
#ifdef RLIM_INFINITY
if (rl.rlim_cur == RLIM_INFINITY)
strcpy(strbuff, "INFINITY");
else
#endif
sprintf(strbuff, fmt, rl.rlim_cur);
fprintf(stderr, "current soft limit: %s\n", strbuff);
#ifdef RLIM_INFINITY
if (rl.rlim_max == RLIM_INFINITY)
strcpy(strbuff, "INFINITY");
else
#endif
sprintf(strbuff, fmt, rl.rlim_max);
fprintf(stderr, "current hard limit: %s\n", strbuff);
} /* (rl.rlim_cur != rl.rlim_max) */
/*
* test 537 is all about testing libcurl functionality
* when the system has nearly exhausted the number of
* available file descriptors. Test 537 will try to run
* with a very small number of file descriptors available.
* This implies that any file descriptor which is open
* when the test runs will have a number in the high range
* of whatever the system supports.
*/
/*
* reserve a chunk of memory before opening file descriptors to
* avoid a low memory condition once the file descriptors are
* open. System conditions that could make the test fail should
* be addressed in the precheck phase. This chunk of memory shall
* be always free()ed before exiting the rlimit() function so
* that it becomes available to the test.
*/
for (nitems = i = 1; nitems <= i; i *= 2)
nitems = i;
if (nitems > 0x7fff)
nitems = 0x40000;
do {
num_open.rlim_max = sizeof(*memchunk) * (size_t)nitems;
sprintf(strbuff, fmt, num_open.rlim_max);
fprintf(stderr, "allocating memchunk %s byte array\n", strbuff);
memchunk = malloc(sizeof(*memchunk) * (size_t)nitems);
if (!memchunk) {
fprintf(stderr, "memchunk, malloc() failed\n");
nitems /= 2;
}
} while (nitems && !memchunk);
if (!memchunk) {
store_errmsg("memchunk, malloc() failed", ERRNO);
fprintf(stderr, "%s\n", msgbuff);
return -4;
}
/* initialize it to fight lazy allocation */
fprintf(stderr, "initializing memchunk array\n");
for (i = 0; i < nitems; i++)
memchunk[i] = -1;
/* set the number of file descriptors we will try to open */
#ifdef RLIM_INFINITY
if ((rl.rlim_cur > 0) && (rl.rlim_cur != RLIM_INFINITY)) {
#else
if (rl.rlim_cur > 0) {
#endif
/* soft limit minus SAFETY_MARGIN */
num_open.rlim_max = rl.rlim_cur - SAFETY_MARGIN;
}
else {
/* a huge number of file descriptors */
for (nitems = i = 1; nitems <= i; i *= 2)
nitems = i;
if (nitems > 0x7fff)
nitems = 0x40000;
num_open.rlim_max = nitems;
}
/* verify that we won't overflow size_t in malloc() */
if ((size_t)(num_open.rlim_max) > ((size_t)-1) / sizeof(*fd)) {
sprintf(strbuff1, fmt, num_open.rlim_max);
sprintf(strbuff, "unable to allocate an array for %s "
"file descriptors, would overflow size_t", strbuff1);
store_errmsg(strbuff, 0);
fprintf(stderr, "%s\n", msgbuff);
free(memchunk);
return -5;
}
/* allocate array for file descriptors */
do {
sprintf(strbuff, fmt, num_open.rlim_max);
fprintf(stderr, "allocating array for %s file descriptors\n", strbuff);
fd = malloc(sizeof(*fd) * (size_t)(num_open.rlim_max));
if (!fd) {
fprintf(stderr, "fd, malloc() failed\n");
num_open.rlim_max /= 2;
}
} while (num_open.rlim_max && !fd);
if (!fd) {
store_errmsg("fd, malloc() failed", ERRNO);
fprintf(stderr, "%s\n", msgbuff);
free(memchunk);
return -6;
}
/* initialize it to fight lazy allocation */
fprintf(stderr, "initializing fd array\n");
for (num_open.rlim_cur = 0;
num_open.rlim_cur < num_open.rlim_max;
num_open.rlim_cur++)
fd[num_open.rlim_cur] = -1;
sprintf(strbuff, fmt, num_open.rlim_max);
fprintf(stderr, "trying to open %s file descriptors\n", strbuff);
/* open a dummy descriptor */
fd[0] = open(DEV_NULL, O_RDONLY);
if (fd[0] < 0) {
sprintf(strbuff, "opening of %s failed", DEV_NULL);
store_errmsg(strbuff, ERRNO);
fprintf(stderr, "%s\n", msgbuff);
free(fd);
fd = NULL;
free(memchunk);
return -7;
}
/* create a bunch of file descriptors */
for (num_open.rlim_cur = 1;
num_open.rlim_cur < num_open.rlim_max;
num_open.rlim_cur++) {
fd[num_open.rlim_cur] = dup(fd[0]);
if (fd[num_open.rlim_cur] < 0) {
fd[num_open.rlim_cur] = -1;
sprintf(strbuff1, fmt, num_open.rlim_cur);
sprintf(strbuff, "dup() attempt %s failed", strbuff1);
fprintf(stderr, "%s\n", strbuff);
sprintf(strbuff1, fmt, num_open.rlim_cur);
sprintf(strbuff, "fds system limit seems close to %s", strbuff1);
fprintf(stderr, "%s\n", strbuff);
num_open.rlim_max = num_open.rlim_cur - SAFETY_MARGIN;
num_open.rlim_cur -= num_open.rlim_max;
sprintf(strbuff1, fmt, num_open.rlim_cur);
sprintf(strbuff, "closing %s file descriptors", strbuff1);
fprintf(stderr, "%s\n", strbuff);
for (num_open.rlim_cur = num_open.rlim_max;
fd[num_open.rlim_cur] >= 0;
num_open.rlim_cur++) {
close(fd[num_open.rlim_cur]);
fd[num_open.rlim_cur] = -1;
}
sprintf(strbuff, fmt, num_open.rlim_max);
fprintf(stderr, "shrinking array for %s file descriptors\n", strbuff);
/* we don't care if we can't shrink it */
tmpfd = realloc(fd, sizeof(*fd) * (size_t)(num_open.rlim_max));
if (tmpfd) {
fd = tmpfd;
tmpfd = NULL;
}
break;
}
}
sprintf(strbuff, fmt, num_open.rlim_max);
fprintf(stderr, "%s file descriptors open\n", strbuff);
#if !defined(HAVE_POLL_FINE) && \
!defined(USE_WINSOCK) && \
!defined(TPF)
/*
* when using select() instead of poll() we cannot test
* libcurl functionality with a socket number equal or
* greater than FD_SETSIZE. In any case, macro VERIFY_SOCK
* in lib/select.c enforces this check and protects libcurl
* from a possible crash. The effect of this protection
* is that test 537 will always fail, since the actual
* call to select() never takes place. We skip test 537
* with an indication that select limit would be exceeded.
*/
num_open.rlim_cur = FD_SETSIZE - SAFETY_MARGIN;
if (num_open.rlim_max > num_open.rlim_cur) {
sprintf(strbuff, "select limit is FD_SETSIZE %d", FD_SETSIZE);
store_errmsg(strbuff, 0);
fprintf(stderr, "%s\n", msgbuff);
close_file_descriptors();
free(memchunk);
return -8;
}
num_open.rlim_cur = FD_SETSIZE - SAFETY_MARGIN;
for (rl.rlim_cur = 0;
rl.rlim_cur < num_open.rlim_max;
rl.rlim_cur++) {
if (fd[rl.rlim_cur] > num_open.rlim_cur) {
sprintf(strbuff, "select limit is FD_SETSIZE %d", FD_SETSIZE);
store_errmsg(strbuff, 0);
fprintf(stderr, "%s\n", msgbuff);
close_file_descriptors();
free(memchunk);
return -9;
}
}
#endif /* using a FD_SETSIZE bound select() */
/* test stdio's capability to fopen() SAFETY_MARGIN additional files */
if (!fopen_works()) {
sprintf(strbuff1, fmt, num_open.rlim_max);
sprintf(strbuff, "stdio fopen() fails with %s open() files",
strbuff1);
store_errmsg(strbuff, 0);
fprintf(stderr, "%s\n", msgbuff);
close_file_descriptors();
free(memchunk);
return -10;
}
/* free the chunk of memory we were reserving so that it
becomes becomes available to the test */
free(memchunk);
/* close file descriptors unless instructed to keep them */
if (!keep_open) {
close_file_descriptors();
}
return 0;
}
int test(char *URL)
{
CURLcode res;
CURL *curl;
if(!strcmp(URL, "check")) {
/* used by the test script to ask if we can run this test or not */
if(rlimit(FALSE)) {
fprintf(stdout, "rlimit problem: %s\n", msgbuff);
return 1;
}
return 0; /* sure, run this! */
}
if (rlimit(TRUE)) {
/* failure */
return TEST_ERR_MAJOR_BAD;
}
/* run the test with the bunch of open file descriptors
and close them all once the test is over */
if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK) {
fprintf(stderr, "curl_global_init() failed\n");
close_file_descriptors();
return TEST_ERR_MAJOR_BAD;
}
if ((curl = curl_easy_init()) == NULL) {
fprintf(stderr, "curl_easy_init() failed\n");
close_file_descriptors();
curl_global_cleanup();
return TEST_ERR_MAJOR_BAD;
}
curl_easy_setopt(curl, CURLOPT_URL, URL);
curl_easy_setopt(curl, CURLOPT_HEADER, TRUE);
res = curl_easy_perform(curl);
close_file_descriptors();
curl_easy_cleanup(curl);
curl_global_cleanup();
return (int)res;
}
#else /* defined(HAVE_GETRLIMIT) && defined(HAVE_SETRLIMIT) */
int test(char *URL)
{
(void)URL;
printf("system lacks necessary system function(s)");
return 1; /* skip test */
}
#endif /* defined(HAVE_GETRLIMIT) && defined(HAVE_SETRLIMIT) */
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