mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-08 00:16:11 +00:00
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#include <elf.h>
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#include <link.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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int
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main (int argc, char **argv, char **envp)
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{
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ElfW(auxv_t) auxv;
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ElfW(auxv_t) *auxv_p;
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void *entry0 = NULL;
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void *entry1 = NULL;
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char *platform0 = NULL;
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char *platform1 = NULL;
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// First try the "traditional" way.
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while (*envp++ != NULL)
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; /* Skip, skip, skip... and after finding a NULL we have the auxv. */
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for (auxv_p = (ElfW(auxv_t) *) envp;
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auxv_p->a_type != AT_NULL;
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auxv_p++)
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{
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if (auxv_p->a_type == AT_ENTRY)
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entry0 = (void *) auxv_p->a_un.a_val;
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if (auxv_p->a_type == AT_PLATFORM)
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platform0 = strdup((char *) auxv_p->a_un.a_val);
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}
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// Now the /proc way as often used in libraries.
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int fd = open("/proc/self/auxv", O_RDONLY);
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if (fd == -1)
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return -1;
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while (read(fd, &auxv, sizeof(auxv)) == sizeof(auxv))
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{
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if (auxv.a_type == AT_ENTRY)
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entry1 = (void *) auxv.a_un.a_val;
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if (auxv.a_type == AT_PLATFORM)
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platform1 = strdup((char *) auxv.a_un.a_val);
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}
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close(fd);
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if (entry0 == entry1 && entry0 != NULL)
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fprintf(stderr, "entries OK\n");
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if (strcmp (platform0, platform1) == 0)
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fprintf(stderr, "platform OK\n");
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free (platform0);
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free (platform1);
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return 0;
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}
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