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Bionic lacks ttyname_r; provide a workaround

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Signed-off-by: Matt Whitlock <busybox@mattwhitlock.name>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Matt Whitlock 2015-04-25 21:32:48 +02:00 committed by Denys Vlasenko
parent de5edadee2
commit cee59053dc
2 changed files with 26 additions and 0 deletions
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7
include/platform.h
View File

@ -368,6 +368,7 @@ typedef unsigned smalluint;
#define HAVE_DPRINTF 1
#define HAVE_MEMRCHR 1
#define HAVE_MKDTEMP 1
#define HAVE_TTYNAME_R 1
#define HAVE_PTSNAME_R 1
#define HAVE_SETBIT 1
#define HAVE_SIGHANDLER_T 1
@ -480,6 +481,7 @@ typedef unsigned smalluint;
#if defined(ANDROID) || defined(__ANDROID__)
# undef HAVE_DPRINTF
# undef HAVE_TTYNAME_R
# undef HAVE_GETLINE
# undef HAVE_STPCPY
# undef HAVE_STRCHRNUL
@ -505,6 +507,11 @@ extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
extern char *mkdtemp(char *template) FAST_FUNC;
#endif
#ifndef HAVE_TTYNAME_R
#define ttyname_r bb_ttyname_r
extern int ttyname_r(int fd, char *buf, size_t buflen);
#endif
#ifndef HAVE_SETBIT
# define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
# define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))

19
libbb/platform.c
View File

@ -194,3 +194,22 @@ ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
return len;
}
#endif
#ifndef HAVE_TTYNAME_R
int ttyname_r(int fd, char *buf, size_t buflen)
{
int r;
char path[sizeof("/proc/self/fd/%d") + sizeof(int)*3];
if (!isatty(fd))
return errno == EINVAL ? ENOTTY : errno;
sprintf(path, "/proc/self/fd/%d", fd);
r = readlink(path, buf, buflen);
if (r < 0)
return errno;
if (r >= buflen)
return ERANGE;
buf[r] = '\0';
return 0;
}
#endif