509 lines
13 KiB
C
509 lines
13 KiB
C
/*****************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* $Id: lib518.c,v 1.36 2008-09-20 04:26:57 yangtse Exp $
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*/
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#include "test.h"
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_RESOURCE_H
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#include <sys/resource.h>
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#endif
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "memdebug.h"
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#ifndef FD_SETSIZE
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#error "this test requires FD_SETSIZE"
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#endif
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#define SAFETY_MARGIN (16)
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#define NUM_OPEN (FD_SETSIZE + 10)
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#define NUM_NEEDED (NUM_OPEN + SAFETY_MARGIN)
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#if defined(WIN32) || defined(_WIN32) || defined(MSDOS)
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#define DEV_NULL "NUL"
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#else
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#define DEV_NULL "/dev/null"
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#endif
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#if defined(HAVE_GETRLIMIT) && defined(HAVE_SETRLIMIT)
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static int *fd = NULL;
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static struct rlimit num_open;
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static char msgbuff[256];
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static void store_errmsg(const char *msg, int err)
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{
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if (!err)
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sprintf(msgbuff, "%s", msg);
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else
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sprintf(msgbuff, "%s, errno %d, %s", msg, err, strerror(err));
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}
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static void close_file_descriptors(void)
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{
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for (num_open.rlim_cur = 0;
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num_open.rlim_cur < num_open.rlim_max;
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num_open.rlim_cur++)
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if (fd[num_open.rlim_cur] > 0)
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close(fd[num_open.rlim_cur]);
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free(fd);
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fd = NULL;
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}
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static int fopen_works(void)
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{
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FILE *fpa[3];
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int i;
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int ret = 1;
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for (i = 0; i < 3; i++) {
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fpa[i] = NULL;
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}
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for (i = 0; i < 3; i++) {
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fpa[i] = fopen(DEV_NULL, "r");
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if (fpa[i] == NULL) {
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store_errmsg("fopen() failed", ERRNO);
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fprintf(stderr, "%s\n", msgbuff);
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ret = 0;
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break;
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}
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}
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for (i = 0; i < 3; i++) {
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if (fpa[i] != NULL)
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fclose(fpa[i]);
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}
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return ret;
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}
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static int rlimit(int keep_open)
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{
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int nitems, i;
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int *memchunk = NULL;
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char *fmt;
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struct rlimit rl;
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char strbuff[256];
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char strbuff1[81];
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char strbuff2[81];
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char fmt_u[] = "%u";
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char fmt_lu[] = "%lu";
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#ifdef HAVE_LONGLONG
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char fmt_llu[] = "%llu";
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if (sizeof(rl.rlim_max) > sizeof(long))
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fmt = fmt_llu;
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else
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#endif
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fmt = (sizeof(rl.rlim_max) < sizeof(long))?fmt_u:fmt_lu;
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/* get initial open file limits */
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if (getrlimit(RLIMIT_NOFILE, &rl) != 0) {
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store_errmsg("getrlimit() failed", ERRNO);
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fprintf(stderr, "%s\n", msgbuff);
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return -1;
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}
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/* show initial open file limits */
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#ifdef RLIM_INFINITY
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if (rl.rlim_cur == RLIM_INFINITY)
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strcpy(strbuff, "INFINITY");
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else
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#endif
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sprintf(strbuff, fmt, rl.rlim_cur);
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fprintf(stderr, "initial soft limit: %s\n", strbuff);
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#ifdef RLIM_INFINITY
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if (rl.rlim_max == RLIM_INFINITY)
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strcpy(strbuff, "INFINITY");
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else
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#endif
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sprintf(strbuff, fmt, rl.rlim_max);
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fprintf(stderr, "initial hard limit: %s\n", strbuff);
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/* show our constants */
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fprintf(stderr, "test518 FD_SETSIZE: %d\n", FD_SETSIZE);
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fprintf(stderr, "test518 NUM_OPEN : %d\n", NUM_OPEN);
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fprintf(stderr, "test518 NUM_NEEDED: %d\n", NUM_NEEDED);
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/*
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* if soft limit and hard limit are different we ask the
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* system to raise soft limit all the way up to the hard
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* limit. Due to some other system limit the soft limit
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* might not be raised up to the hard limit. So from this
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* point the resulting soft limit is our limit. Trying to
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* open more than soft limit file descriptors will fail.
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*/
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if (rl.rlim_cur != rl.rlim_max) {
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#ifdef OPEN_MAX
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if ((rl.rlim_cur > 0) &&
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(rl.rlim_cur < OPEN_MAX)) {
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fprintf(stderr, "raising soft limit up to OPEN_MAX\n");
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rl.rlim_cur = OPEN_MAX;
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if (setrlimit(RLIMIT_NOFILE, &rl) != 0) {
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/* on failure don't abort just issue a warning */
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store_errmsg("setrlimit() failed", ERRNO);
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fprintf(stderr, "%s\n", msgbuff);
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msgbuff[0] = '\0';
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}
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}
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#endif
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fprintf(stderr, "raising soft limit up to hard limit\n");
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rl.rlim_cur = rl.rlim_max;
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if (setrlimit(RLIMIT_NOFILE, &rl) != 0) {
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/* on failure don't abort just issue a warning */
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store_errmsg("setrlimit() failed", ERRNO);
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fprintf(stderr, "%s\n", msgbuff);
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msgbuff[0] = '\0';
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}
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/* get current open file limits */
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if (getrlimit(RLIMIT_NOFILE, &rl) != 0) {
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store_errmsg("getrlimit() failed", ERRNO);
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fprintf(stderr, "%s\n", msgbuff);
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return -3;
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}
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/* show current open file limits */
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#ifdef RLIM_INFINITY
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if (rl.rlim_cur == RLIM_INFINITY)
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strcpy(strbuff, "INFINITY");
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else
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#endif
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sprintf(strbuff, fmt, rl.rlim_cur);
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fprintf(stderr, "current soft limit: %s\n", strbuff);
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#ifdef RLIM_INFINITY
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if (rl.rlim_max == RLIM_INFINITY)
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strcpy(strbuff, "INFINITY");
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else
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#endif
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sprintf(strbuff, fmt, rl.rlim_max);
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fprintf(stderr, "current hard limit: %s\n", strbuff);
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} /* (rl.rlim_cur != rl.rlim_max) */
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/*
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* test 518 is all about testing libcurl functionality
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* when more than FD_SETSIZE file descriptors are open.
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* This means that if for any reason we are not able to
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* open more than FD_SETSIZE file descriptors then test
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* 518 should not be run.
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*/
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/*
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* verify that soft limit is higher than NUM_NEEDED,
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* which is the number of file descriptors we would
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* try to open plus SAFETY_MARGIN to not exhaust the
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* file descriptor pool
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*/
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num_open.rlim_cur = NUM_NEEDED;
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if ((rl.rlim_cur > 0) &&
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#ifdef RLIM_INFINITY
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(rl.rlim_cur != RLIM_INFINITY) &&
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#endif
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(rl.rlim_cur <= num_open.rlim_cur)) {
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sprintf(strbuff2, fmt, rl.rlim_cur);
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sprintf(strbuff1, fmt, num_open.rlim_cur);
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sprintf(strbuff, "fds needed %s > system limit %s",
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strbuff1, strbuff2);
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store_errmsg(strbuff, 0);
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fprintf(stderr, "%s\n", msgbuff);
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return -4;
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}
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/*
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* reserve a chunk of memory before opening file descriptors to
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* avoid a low memory condition once the file descriptors are
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* open. System conditions that could make the test fail should
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* be addressed in the precheck phase. This chunk of memory shall
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* be always free()ed before exiting the rlimit() function so
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* that it becomes available to the test.
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*/
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for (nitems = i = 1; nitems <= i; i *= 2)
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nitems = i;
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if (nitems > 0x7fff)
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nitems = 0x40000;
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do {
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num_open.rlim_max = sizeof(*memchunk) * (size_t)nitems;
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sprintf(strbuff, fmt, num_open.rlim_max);
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fprintf(stderr, "allocating memchunk %s byte array\n", strbuff);
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memchunk = malloc(sizeof(*memchunk) * (size_t)nitems);
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if (!memchunk) {
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fprintf(stderr, "memchunk, malloc() failed\n");
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nitems /= 2;
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}
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} while (nitems && !memchunk);
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if (!memchunk) {
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store_errmsg("memchunk, malloc() failed", ERRNO);
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fprintf(stderr, "%s\n", msgbuff);
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return -5;
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}
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/* initialize it to fight lazy allocation */
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fprintf(stderr, "initializing memchunk array\n");
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for (i = 0; i < nitems; i++)
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memchunk[i] = -1;
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/* set the number of file descriptors we will try to open */
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num_open.rlim_max = NUM_OPEN;
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/* verify that we won't overflow size_t in malloc() */
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if ((size_t)(num_open.rlim_max) > ((size_t)-1) / sizeof(*fd)) {
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sprintf(strbuff1, fmt, num_open.rlim_max);
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sprintf(strbuff, "unable to allocate an array for %s "
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"file descriptors, would overflow size_t", strbuff1);
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store_errmsg(strbuff, 0);
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fprintf(stderr, "%s\n", msgbuff);
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free(memchunk);
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return -6;
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}
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/* allocate array for file descriptors */
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sprintf(strbuff, fmt, num_open.rlim_max);
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fprintf(stderr, "allocating array for %s file descriptors\n", strbuff);
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fd = malloc(sizeof(*fd) * (size_t)(num_open.rlim_max));
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if (!fd) {
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store_errmsg("fd, malloc() failed", ERRNO);
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fprintf(stderr, "%s\n", msgbuff);
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free(memchunk);
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return -7;
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}
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/* initialize it to fight lazy allocation */
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fprintf(stderr, "initializing fd array\n");
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for (num_open.rlim_cur = 0;
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num_open.rlim_cur < num_open.rlim_max;
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num_open.rlim_cur++)
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fd[num_open.rlim_cur] = -1;
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sprintf(strbuff, fmt, num_open.rlim_max);
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fprintf(stderr, "trying to open %s file descriptors\n", strbuff);
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/* open a dummy descriptor */
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fd[0] = open(DEV_NULL, O_RDONLY);
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if (fd[0] < 0) {
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sprintf(strbuff, "opening of %s failed", DEV_NULL);
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store_errmsg(strbuff, ERRNO);
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fprintf(stderr, "%s\n", msgbuff);
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free(fd);
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fd = NULL;
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free(memchunk);
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return -8;
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}
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/* create a bunch of file descriptors */
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for (num_open.rlim_cur = 1;
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num_open.rlim_cur < num_open.rlim_max;
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num_open.rlim_cur++) {
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fd[num_open.rlim_cur] = dup(fd[0]);
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if (fd[num_open.rlim_cur] < 0) {
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fd[num_open.rlim_cur] = -1;
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sprintf(strbuff1, fmt, num_open.rlim_cur);
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sprintf(strbuff, "dup() attempt %s failed", strbuff1);
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fprintf(stderr, "%s\n", strbuff);
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sprintf(strbuff1, fmt, num_open.rlim_cur);
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sprintf(strbuff, "fds system limit seems close to %s", strbuff1);
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fprintf(stderr, "%s\n", strbuff);
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num_open.rlim_max = NUM_NEEDED;
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sprintf(strbuff2, fmt, num_open.rlim_max);
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sprintf(strbuff1, fmt, num_open.rlim_cur);
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sprintf(strbuff, "fds needed %s > system limit %s",
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strbuff2, strbuff1);
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store_errmsg(strbuff, 0);
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fprintf(stderr, "%s\n", msgbuff);
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for (num_open.rlim_cur = 0;
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fd[num_open.rlim_cur] >= 0;
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num_open.rlim_cur++)
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close(fd[num_open.rlim_cur]);
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free(fd);
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fd = NULL;
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free(memchunk);
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return -9;
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}
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}
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sprintf(strbuff, fmt, num_open.rlim_max);
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fprintf(stderr, "%s file descriptors open\n", strbuff);
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#if !defined(HAVE_POLL_FINE) && \
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!defined(USE_WINSOCK) && \
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!defined(TPF)
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/*
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* when using select() instead of poll() we cannot test
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* libcurl functionality with a socket number equal or
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* greater than FD_SETSIZE. In any case, macro VERIFY_SOCK
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* in lib/select.c enforces this check and protects libcurl
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* from a possible crash. The effect of this protection
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* is that test 518 will always fail, since the actual
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* call to select() never takes place. We skip test 518
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* with an indication that select limit would be exceeded.
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*/
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num_open.rlim_cur = FD_SETSIZE - SAFETY_MARGIN;
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if (num_open.rlim_max > num_open.rlim_cur) {
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sprintf(strbuff, "select limit is FD_SETSIZE %d", FD_SETSIZE);
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store_errmsg(strbuff, 0);
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fprintf(stderr, "%s\n", msgbuff);
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close_file_descriptors();
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free(memchunk);
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return -10;
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}
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num_open.rlim_cur = FD_SETSIZE - SAFETY_MARGIN;
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for (rl.rlim_cur = 0;
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rl.rlim_cur < num_open.rlim_max;
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rl.rlim_cur++) {
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if ((fd[rl.rlim_cur] > 0) &&
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((unsigned int)fd[rl.rlim_cur] > num_open.rlim_cur)) {
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sprintf(strbuff, "select limit is FD_SETSIZE %d", FD_SETSIZE);
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store_errmsg(strbuff, 0);
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fprintf(stderr, "%s\n", msgbuff);
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close_file_descriptors();
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free(memchunk);
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return -11;
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}
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}
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#endif /* using a FD_SETSIZE bound select() */
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/*
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* Old or 'backwards compatible' implementations of stdio do not allow
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* handling of streams with an underlying file descriptor number greater
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* than 255, even when allowing high numbered file descriptors for sockets.
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* At this point we have a big number of file descriptors which have been
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* opened using dup(), so lets test the stdio implementation and discover
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* if it is capable of fopen()ing some additional files.
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*/
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if (!fopen_works()) {
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sprintf(strbuff1, fmt, num_open.rlim_max);
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sprintf(strbuff, "stdio fopen() fails with %s fds open()",
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strbuff1);
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fprintf(stderr, "%s\n", msgbuff);
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sprintf(strbuff, "stdio fopen() fails with lots of fds open()");
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store_errmsg(strbuff, 0);
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close_file_descriptors();
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free(memchunk);
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return -12;
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}
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/* free the chunk of memory we were reserving so that it
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becomes becomes available to the test */
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free(memchunk);
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/* close file descriptors unless instructed to keep them */
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if (!keep_open) {
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close_file_descriptors();
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}
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return 0;
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}
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int test(char *URL)
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{
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CURLcode res;
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CURL *curl;
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if(!strcmp(URL, "check")) {
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/* used by the test script to ask if we can run this test or not */
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if(rlimit(FALSE)) {
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fprintf(stdout, "rlimit problem: %s\n", msgbuff);
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return 1;
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}
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return 0; /* sure, run this! */
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}
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if (rlimit(TRUE)) {
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/* failure */
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return TEST_ERR_MAJOR_BAD;
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}
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/* run the test with the bunch of open file descriptors
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and close them all once the test is over */
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if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK) {
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fprintf(stderr, "curl_global_init() failed\n");
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close_file_descriptors();
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return TEST_ERR_MAJOR_BAD;
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}
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if ((curl = curl_easy_init()) == NULL) {
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fprintf(stderr, "curl_easy_init() failed\n");
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close_file_descriptors();
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curl_global_cleanup();
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return TEST_ERR_MAJOR_BAD;
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}
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curl_easy_setopt(curl, CURLOPT_URL, URL);
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curl_easy_setopt(curl, CURLOPT_HEADER, 1L);
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res = curl_easy_perform(curl);
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close_file_descriptors();
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curl_easy_cleanup(curl);
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curl_global_cleanup();
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return (int)res;
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}
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#else /* defined(HAVE_GETRLIMIT) && defined(HAVE_SETRLIMIT) */
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int test(char *URL)
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{
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(void)URL;
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printf("system lacks necessary system function(s)");
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return 1; /* skip test */
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}
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#endif /* defined(HAVE_GETRLIMIT) && defined(HAVE_SETRLIMIT) */
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