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