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:
429 bytes
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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 "syscall.h"
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7 |
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8 | unsigned if_nametoindex(const char *name)
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9 | {
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10 | struct ifreq ifr;
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11 | int fd, r;
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12 |
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13 | if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
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14 | strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
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15 | r = ioctl(fd, SIOCGIFINDEX, &ifr);
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16 | __syscall(SYS_close, fd);
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17 | return r < 0 ? 0 : ifr.ifr_ifindex;
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18 | }
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