102 lines
2.6 KiB
C
102 lines
2.6 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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* $Id$
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*
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* Little tool to raise the amount of maximum file descriptor and then run the
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* given command line (using the hard-coded uid/gid).
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*
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*/
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#include <stdio.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h> /* for errno translation */
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/* ulimiter
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*
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* Source code inspiration from:
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* http://www.cs.wisc.edu/condor/condorg/linux_scalability.html
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*/
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#define UID 1000 /* the user who must run this */
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#define GID 1000 /* group id to run the program as */
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/* Number of open files to increase to */
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#define NEW_MAX 10000
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int main(int argc, char *argv[])
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{
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int ret;
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struct rlimit rl;
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char *brgv[20];
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int brgc=argc-1;
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int i;
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for(i=1; i< argc; i++)
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brgv[i-1]=argv[i];
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brgv[i-1]=NULL; /* terminate the list */
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if(getuid() != UID) {
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fprintf(stderr, "Only uid %d is allowed to run this\n", UID);
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return 1;
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}
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ret = getrlimit(RLIMIT_NOFILE, &rl);
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if(ret != 0) {
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fprintf(stderr, "Unable to read open file limit.\n"
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"(getrlimit(RLIMIT_NOFILE, &rl) failed)\n"
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"(%d, %s)", errno, strerror(errno));
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return 1;
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}
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fprintf(stderr, "Limit was %d (max %d), setting to %d\n",
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rl.rlim_cur, rl.rlim_max, NEW_MAX);
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rl.rlim_cur = rl.rlim_max = NEW_MAX;
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ret = setrlimit(RLIMIT_NOFILE, &rl);
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if(ret != 0) {
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fprintf(stderr, "Unable to set open file limit.\n"
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"(setrlimit(RLIMIT_NOFILE, &rl) failed)\n"
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"(%d, %s)", errno, strerror(errno));
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return 1;
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}
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ret = getrlimit(RLIMIT_NOFILE, &rl);
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if(ret != 0) {
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fprintf(stderr, "Unable to read new open file limit.\n"
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"(getrlimit(RLIMIT_NOFILE, &rl) failed)\n"
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"(%d, %s)", errno, strerror(errno));
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return 1;
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}
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if(rl.rlim_cur < NEW_MAX) {
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fprintf(stderr, "Failed to set new open file limit.\n"
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"Limit is %d, expected %d\n",
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rl.rlim_cur, NEW_MAX);
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return 1;
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}
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if(setgid(GID) != 0) {
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fprintf(stderr, "setgid failed (%d, %s)\n", errno, strerror(errno));
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return 1;
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}
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if(setuid(UID) != 0) {
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fprintf(stderr, "setuid failed (%d, %s)\n", errno, strerror(errno));
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return 1;
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}
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ret = execv(brgv[0], brgv);
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fprintf(stderr, "execl returned, failure\n"
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"returned %d, errno is %d (%s)\n",
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ret, errno, strerror(errno));
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return 1;
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}
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