strace/tests/swap.c

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#include "tests.h"
#include <sys/syscall.h>
#if defined __NR_swapon && defined __NR_swapoff
# include <stdio.h>
# include <sys/swap.h>
# include <unistd.h>
int
main(void)
{
static const char sample[] = "swap.sample";
long rc;
rc = syscall(__NR_swapon, sample, 0);
printf("swapon(\"%s\", %s) = %ld %s (%m)\n",
sample, "0", rc, errno2name());
rc = syscall(__NR_swapon, sample, 42);
printf("swapon(\"%s\", %s) = %ld %s (%m)\n",
sample, "42", rc, errno2name());
rc = syscall(__NR_swapon, sample, SWAP_FLAG_PREFER);
printf("swapon(\"%s\", %s) = %ld %s (%m)\n",
sample, "SWAP_FLAG_PREFER", rc, errno2name());
rc = syscall(__NR_swapon, sample, SWAP_FLAG_PREFER | 42);
printf("swapon(\"%s\", %s) = %ld %s (%m)\n",
sample, "SWAP_FLAG_PREFER|42", rc, errno2name());
rc = syscall(__NR_swapon, sample, -1L);
printf("swapon(\"%s\", %s) = %ld %s (%m)\n",
sample,
"SWAP_FLAG_PREFER|SWAP_FLAG_DISCARD|SWAP_FLAG_DISCARD_ONCE"
"|SWAP_FLAG_DISCARD_PAGES|0xfff80000|32767",
rc, errno2name());
rc = syscall(__NR_swapoff, sample);
printf("swapoff(\"%s\") = %ld %s (%m)\n",
sample, rc, errno2name());
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_swapon && __NR_swapoff")
#endif