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ape/mkstemp: better options

Use O_EXCL and make the file descriptor writeable.  This is more
usefull and it conforms to Single Unix and other specs.

--- a/sys/src/ape/lib/ap/gen/mkstemp.c

+++ b/sys/src/ape/lib/ap/gen/mkstemp.c

@@ -1,6 +1,7 @@

 #include <stdlib.h>

 #include <string.h>

 #include <unistd.h>

+#include <fcntl.h>

 int

 mkstemp(char *template)

@@ -14,7 +15,7 @@

    for(i=0; i<20; i++){

        strcpy(s, template);

        mktemp(s);

-       if((fd = creat(s, 0666)) >= 0){

+       if((fd = open(s, O_RDWR | O_CREAT | O_EXCL, 0600)) >= 0){

            strcpy(template, s);

            free(s);

            return fd;

-- 

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