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Make us a little safer, by writing to a tempfile, and rename when done.

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Still needs more locking I belive.
This commit is contained in:
Poul-Henning Kamp 1995-02-23 04:51:36 +00:00
parent 227b711d8e
commit d742998bc1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6658
1 changed files with 14 additions and 4 deletions
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18
usr.sbin/ctm/ctm_rmail/ctm_rmail.c
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@ -213,6 +213,7 @@ read_piece(char *input_file)
char line[200];
char delta[30];
char pname[1000];
char tname[1000];
char junk[2];
ifp = stdin;
@ -241,9 +242,10 @@ read_piece(char *input_file)
*s = '_';
mk_piece_name(pname, delta, pce, npieces);
if ((ofp = fopen(pname, "w")) == NULL)
sprintf(tname,"tmp.%s",pname);
if ((ofp = fopen(tname, "w")) == NULL)
{
err("cannot open '%s' for writing", pname);
err("cannot open '%s' for writing", tname);
status++;
continue;
}
@ -267,7 +269,7 @@ read_piece(char *input_file)
fclose(ofp);
if (e)
err("error writing %s", pname);
err("error writing %s", tname);
if (cksum != claimed_cksum)
err("checksum: read %d, calculated %d", claimed_cksum, cksum);
@ -275,7 +277,15 @@ read_piece(char *input_file)
if (e || cksum != claimed_cksum)
{
err("%s %d/%d discarded", delta, pce, npieces);
unlink(pname);
unlink(tname);
status++;
continue;
}
if (rename(tname, pname) < 0)
{
err("error renaming %s to %s",tname,pname);
unlink(tname);
status++;
continue;
}