tmpnam - Generate unique temporary file name

Definition	#include <stdio.h> char *tmpnam(char *s); tmpnam generates a unique file name from the TSN number of the current task, an internal identifier, the time, the date, and a number of up to four digits. Each time tmpnam is called this number changes; so, too, does the time each time a second elapses. This ensures that the name is always different from the names of existing files. tmpnam can be called at most TMP_MAX times. The file name can then be used for creating any new file.
Return val.	Pointer to the generated name
		If s is a NULL pointer, tmpnam writes the result to an internal C memory area which is overwritten with each call. If s is not a NULL pointer tmpnam writes the result to the result string s. Sufficient memory to take at least L_tmpnam characters must be made available for s. L_tmpnam is defined in <stdio.h>.
	0	if tmpnam has been called more than TMP_MAX times.
Notes	tmpnam generates a maximum of TMP_MAX names. TMP_MAX is defined in the include file <stdio.h>. Files opened with names generated by tmpnam are not automatically deleted at the end of the program or task. The files must be explicitly deleted (e.g. with remove).
Example	#include <stdio.h> int main(void) {  FILE *fp1;  FILE *fp2;  char nam1[L_tmpnam];  char nam2[L_tmpnam];  tmpnam(nam1);  printf("Name1: %s\n", nam1); /* Name1: S.C.UNQ.1RCP.00.13211.2709199.0000 */  fp1 = fopen(nam1, "w+r");  tmpnam(nam2);  printf("Name2: %s\n", nam2); /* Name2: S.C.UNQ.1RCP.00.13211.2709199.0001 */  fp2 = fopen(nam2, "w+r");  fclose(fp1);  fclose(fp2);  remove(nam1);  remove(nam2); }
See also	tmpfile, tmpfile64, mktemp, remove