tail head cat sleep
QR code linking to this page

Manual Pages  — STRDUP


strdup, strndup – save a copy of a string



Standard C Library (libc, -lc)


#include <string.h>

char *
strdup(const char *str);

char *
strndup(const char *str, size_t len);


The strdup() function allocates sufficient memory for a copy of the string str, does the copy, and returns a pointer to it. The pointer may subsequently be used as an argument to the function free(3).

If insufficient memory is available, NULL is returned and errno is set to ENOMEM.

The strndup() function copies at most len characters from the string str always NUL terminating the copied string.


free(3), malloc(3), wcsdup(3)


The strdup() function first appeared in BSD 4.4 . The strndup() function was added in FreeBSD 7.2 .

STRDUP (3) December 5, 2008

tail head cat sleep
QR code linking to this page

Please direct any comments about this manual page service to Ben Bullock.

Ken Thompson has an automobile which he helped design. Unlike most automobiles, it has neither speedometer, nor gas gauge, nor any of the other numerous idiot lights which plague the modern driver. Rather, if the driver makes a mistake, a giant “?” lights up in the center of the dashboard. “The experienced driver,” says Thompson, “will usually know what's wrong.”