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Introduce getifaddrs()

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This function was invented by the BSDs (it's not in POSIX.1). It
provides a high-level interface into ioctl(SIOCGIFCONF) which is
comparatively clumsy to use. We already made the ioctls portable
across our entire support vector back in 2021, so this interface
is portable too. See o//tool/viz/getifaddrs.com for our demo app
This commit is contained in:
Justine Tunney 2023-11-02 08:22:30 -07:00
parent 6ca5ab4680
commit 024be3b009
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5 changed files with 260 additions and 1 deletions
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25
libc/sock/ifaddrs.h Normal file
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#ifndef COSMOPOLITAN_LIBC_SOCK_IFADDRS_H_
#define COSMOPOLITAN_LIBC_SOCK_IFADDRS_H_
#include "libc/sock/struct/sockaddr.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
struct ifaddrs {
struct ifaddrs *ifa_next;
char *ifa_name;
unsigned ifa_flags;
struct sockaddr *ifa_addr;
struct sockaddr *ifa_netmask;
union {
struct sockaddr *ifa_broadaddr;
struct sockaddr *ifa_dstaddr;
};
void *ifa_data;
};
void freeifaddrs(struct ifaddrs *);
int getifaddrs(struct ifaddrs **);
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_SOCK_IFADDRS_H_ */