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Here he/she just includes libraries/API and calls function access() rather than showing the function(System cAll) defintion. Refer to code if you need
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
int main (int argc, char* argv[])
{
char* path = argv[1];
int rval;
/* Check file existence. */
rval = access (path, F_OK);
if (rval == 0)
printf (“%s exists\n”, path);
else {
if (errno == ENOENT)
printf (“%s does not exist\n”, path);
else if (errno == EACCES)
printf (“%s is not accessible\n”, path);
return 0;
}
/* Check read access. */
rval = access (path, R_OK);
if (rval == 0)
printf (“%s is readable\n”, path);
else
printf (“%s is not readable (access denied)\n”, path);
/* Check write access. */
rval = access (path, W_OK);
if (rval == 0)
printf (“%s is writable\n”, path);
else if (errno == EACCES)
printf (“%s is not writable (access denied)\n”, path);
else if (errno == EROFS)
printf (“%s is not writable (read-only filesystem)\n”, path);
return 0;
}
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