My way to check if a progam is already running



Lockfiles are bad, they show up at times as stale,
and then prevent your program to run.

/* This assumes there is a directory ~/.MyProgram/

struct passwd *userinfo;
char temp[4096];
FILE *fptr;
int a, b;

/* get user info */
userinfo = getpwuid(getuid() );

/* get home directory */
home_dir = strsave(userinfo -> pw_dir);

/* test if already a MyProgram running */
sprintf(temp, "pidof MyProgram > %s/.MyProgram/pids", home_dir);
ftr = popen(temp, "w");
pclose(ftr);

sprintf(temp, "%s/.MyProgram/pids", home_dir);
fptr = fopen(temp, "r");
if(fptr)
{
a = fscanf(fptr, "%d %d", &b, &b);
fclose(fptr);

if(a == 2)
{
fprintf(stderr, "MyProgram: An other MyProgram is already running, aborting.\n");

exit(1);
}
}
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What do you think, this good?

.

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