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106 lines
2.4 KiB
106 lines
2.4 KiB
/*
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* UCW Library -- Temporary Files
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*
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* (c) 2002--2008 Martin Mares <mj@ucw.cz>
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* (c) 2008 Michal Vaner <vorner@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/conf.h>
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#include <ucw/threads.h>
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#include <ucw/io.h>
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#include <ucw/fastbuf.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/fcntl.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <errno.h>
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static char *temp_prefix = "temp";
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static char *temp_dir;
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static int public_dir = 1;
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static struct cf_section temp_config = {
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CF_ITEMS {
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CF_STRING("Dir", &temp_dir),
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CF_STRING("Prefix", &temp_prefix),
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CF_INT("PublicDir", &public_dir),
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CF_END
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}
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};
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static void CONSTRUCTOR temp_global_init(void)
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{
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cf_declare_section("Tempfiles", &temp_config, 0);
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}
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void
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temp_file_name(char *name_buf, int *open_flags)
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{
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char *dir = temp_dir;
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if (!dir && !(dir = getenv("TMPDIR")))
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dir = "/tmp";
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int len;
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if (public_dir)
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{
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struct timeval tv;
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if (gettimeofday(&tv, NULL))
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die("gettimeofday() failed: %m");
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len = snprintf(name_buf, TEMP_FILE_NAME_LEN, "%s/%s%u", dir, temp_prefix, (uint) tv.tv_usec);
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if (open_flags)
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*open_flags = O_EXCL;
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}
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else
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{
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struct ucwlib_context *ctx = ucwlib_thread_context();
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int cnt = ++ctx->temp_counter;
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int pid = getpid();
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if (ucwlib_thread_id(ctx) == pid)
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len = snprintf(name_buf, TEMP_FILE_NAME_LEN, "%s/%s%d-%d", dir, temp_prefix, pid, cnt);
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else
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len = snprintf(name_buf, TEMP_FILE_NAME_LEN, "%s/%s%d-%d-%d", dir, temp_prefix, pid, ucwlib_thread_id(ctx), cnt);
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if (open_flags)
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*open_flags = 0;
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}
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ASSERT(len < TEMP_FILE_NAME_LEN);
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}
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int
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open_tmp(char *name_buf, int open_flags, int mode)
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{
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int create_flags, fd, retry = 10;
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do
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{
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temp_file_name(name_buf, &create_flags);
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fd = ucw_open(name_buf, open_flags | create_flags, mode);
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}
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while (fd < 0 && errno == EEXIST && retry --);
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if (fd < 0)
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die("Unable to create temp file %s: %m", name_buf);
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return fd;
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}
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#ifdef TEST
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#include <ucw/getopt.h>
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int main(int argc, char **argv)
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{
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log_init(NULL);
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if (cf_getopt(argc, argv, CF_SHORT_OPTS, CF_NO_LONG_OPTS, NULL) >= 0)
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die("Hey, whaddya want?");
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char buf[TEMP_FILE_NAME_LEN];
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int fd = open_tmp(buf, O_RDWR | O_CREAT | O_TRUNC, 0666);
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close(fd);
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unlink(buf);
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return 0;
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}
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#endif
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