C: Get uid by loginname

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#include <sys/types.h> #include <pwd.h> uid_t getuid_by_loginname(const char *name) {  struct passwd *pwd;  if(name) {   pwd = getpwnam(name); /* don't free, see getpwnam() for details */   if(pwd)    return pwd->pw_uid;  }     return (uid_t)-1; }