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curl/tests/libtest/lib537.c
Yang Tse c2639e0738 when using select() instead of poll, skip the test if the number of 
open file descriptors is greater than FD_SETSIZE minus SAFETY_MARGIN,
also skip the test if any of the open file descriptors has a number
greater than FD_SETSIZE minus SAFETY_MARGIN.
2007-01-31 15:34:53 +00:00

464 lines
12 KiB
C
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/*****************************************************************************
* _ _ ____ _
* 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(CURL_HAVE_WSAPOLL) && \
!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];
/*
* our_errno() returns the NOT *socket-related* errno (or equivalent)
* on this platform to hide platform specific for the calling function.
*/
static int our_errno(void)
{
#ifdef WIN32
return (int)GetLastError();
#else
return errno;
#endif
}
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 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", our_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", our_errno());
fprintf(stderr, "%s\n", msgbuff);
return -2;
}
/* get current open file limits */
if (getrlimit(RLIMIT_NOFILE, &rl) != 0) {
store_errmsg("getrlimit() failed", our_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", our_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", our_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, our_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(CURL_HAVE_WSAPOLL) && \
!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() */
/* 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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