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9ad4d494fa
--fill-free=<hexnumber>, which cause malloc'd(etc) and free'd(etc) blocks to be filled with the specified value. This can apparently be useful for shaking out hard-to-track-down memory corruption. The definedness/addressability of said areas is not affected -- only the contents. Documentation to follow. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7259
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
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/* Test for correct functioning of the --malloc-fill and --free-fill
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flags. Needs --malloc-fill=0x55 and --free-fill=0x77. */
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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int main ( void )
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{
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int *r, *oldr, *a;
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fprintf(stderr, "test simple malloc/free:\n");
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a = malloc(10 * sizeof(int)); assert(a);
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fprintf(stderr, "(should be malloc-filled) a[4] = %x\n", a[4]);
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free(a);
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fprintf(stderr, "(should be free-filled) a[5] = %x\n", a[5]);
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fprintf(stderr, "test realloc-larger:\n");
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r = malloc(30 * sizeof(int)); assert(r);
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fprintf(stderr, "(should be malloc-filled) r[25] = %x\n", r[25]);
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/* Make larger */
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oldr = r;
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r = realloc(r, 40 * sizeof(int)); assert(r);
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fprintf(stderr, "(should be free-filled) oldr[26] = %x\n", oldr[26]);
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fprintf(stderr, "(should be malloc-filled) r[35] = %x\n", r[35]);
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free(r);
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fprintf(stderr, "test realloc-smaller:\n");
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r = malloc(30 * sizeof(int)); assert(r);
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fprintf(stderr, "(should be malloc-filled) r[25] = %x\n", r[25]);
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/* Make smaller */
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oldr = r;
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r = realloc(r, 20 * sizeof(int)); assert(r);
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fprintf(stderr, "(should be free-filled) oldr[26] = %x\n", oldr[26]);
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free(r);
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fprintf(stderr, "test calloc:\n");
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a = calloc(100, sizeof(int)); assert(r);
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fprintf(stderr, "(should be zero) a[42] = %x\n", a[42]);
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free(a);
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return 0;
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}
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