Last change
on this file since 413 was 398, checked in by coas-nagasima, 5 years ago |
mbedTLS版Azure IoT Hub接続サンプルのソースコードを追加
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File size:
509 bytes
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[398] | 1 | #define _GNU_SOURCE
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| 2 | #include <net/if.h>
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| 3 | #include <sys/socket.h>
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| 4 | #include <sys/ioctl.h>
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| 5 | #include <string.h>
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| 6 | #include <errno.h>
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| 7 | #include "syscall.h"
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| 8 |
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| 9 | char *if_indextoname(unsigned index, char *name)
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| 10 | {
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| 11 | struct ifreq ifr;
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| 12 | int fd, r;
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| 13 |
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| 14 | if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
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| 15 | ifr.ifr_ifindex = index;
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| 16 | r = ioctl(fd, SIOCGIFNAME, &ifr);
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| 17 | __syscall(SYS_close, fd);
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| 18 | if (r < 0) {
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| 19 | if (errno == ENODEV) errno = ENXIO;
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| 20 | return 0;
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| 21 | }
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| 22 | return strncpy(name, ifr.ifr_name, IF_NAMESIZE);
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| 23 | }
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