ref: dfb4b522830edab8f3856289d326d6cf5e930644
dir: /sys/src/ape/lib/ap/plan9/access.c/
#include "lib.h" #include <string.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <errno.h> #include <stdlib.h> #include "sys9.h" #include "dir.h" int access(const char *name, int mode) { int fd; Dir *db; struct stat st; static char omode[] = { 0, 3, 1, 2, 0, 2, 2, 2 }; if(mode == 0){ db = _dirstat(name); if(db == nil){ _syserrno(); return -1; } free(db); return 0; } fd = open(name, omode[mode&7]); if(fd >= 0){ close(fd); return 0; } else if(stat(name, &st)==0 && S_ISDIR(st.st_mode)){ if(mode & (R_OK|X_OK)){ fd = open(name, O_RDONLY); if(fd < 0) return -1; close(fd); } if(mode & W_OK){ char *tname; int nname; nname = strlen(name); tname = malloc(nname+32); if(tname == 0) return -1; memset(tname, 0, nname+32); memcpy(tname, name, nname); memcpy(tname+nname, "/_AcChAcK", 9); _ultoa(tname+nname+9, getpid()); fd = _CREATE(tname, ORCLOSE, 0666); if(fd < 0){ _syserrno(); free(tname); return -1; } _CLOSE(fd); free(tname); } return 0; } return -1; }