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/*
* Copyright (C) 2012 Sami Kerola <kerolasa@iki.fi>
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "c.h"
#include "fileutils.h"
#include "pathnames.h"
#include "xalloc.h"
/* Create open temporary file in safe way. Please notice that the
* file permissions are -rw------- by default. */
int xmkstemp(char **tmpname, char *dir)
{
char *localtmp;
char *tmpenv;
mode_t old_mode;
int fd;
/* Some use cases must be capable of being moved atomically
* with rename(2), which is the reason why dir is here. */
if (dir != NULL)
tmpenv = dir;
else
tmpenv = getenv("TMPDIR");
if (tmpenv)
xasprintf(&localtmp, "%s/%s.XXXXXX", tmpenv,
program_invocation_short_name);
else
xasprintf(&localtmp, "%s/%s.XXXXXX", _PATH_TMP,
program_invocation_short_name);
old_mode = umask(077);
fd = mkostemp(localtmp, O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC);
umask(old_mode);
if (fd == -1) {
free(localtmp);
localtmp = NULL;
}
*tmpname = localtmp;
return fd;
}
/*
* portable getdtablesize()
*/
int get_fd_tabsize(void)
{
int m;
#if defined(HAVE_GETDTABLESIZE)
m = getdtablesize();
#elif defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
struct rlimit rl;
getrlimit(RLIMIT_NOFILE, &rl);
m = rl.rlim_cur;
#elif defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
m = sysconf(_SC_OPEN_MAX);
#else
m = OPEN_MAX;
#endif
return m;
}
#ifdef TEST_PROGRAM
int main(void)
{
FILE *f;
char *tmpname;
f = xfmkstemp(&tmpname, NULL);
unlink(tmpname);
free(tmpname);
fclose(f);
return EXIT_FAILURE;
}
#endif
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