Is char *envp[] as a third argument to main() portable

by

The function getenv is the only one specified by the C standard. The function putenv, and the extern environ are POSIX-specific.

EDIT

The main parameter envp is not specified by POSIX but is widely supported.

An alternative method of accessing the environment list is to declare
a third argument to the main() function:

int main(int argc, char *argv[], char *envp[])

This argument can then be treated in the same way as environ, with the
difference that its scope is local to main(). Although this feature is
widely implemented on UNIX systems, its use should be avoided since,
in addition to the scope limitation, it is not specified in SUSv3.

More Related Contents:

  1. What is the LD_PRELOAD trick?
  2. int main() vs void main() in C [duplicate]
  3. How to measure time in milliseconds using ANSI C?
  4. Why bit endianness is an issue in bitfields?
  5. Why does glibc’s strlen need to be so complicated to run quickly?
  6. How to change entry point of C program with gcc?
  7. How should I print types like off_t and size_t?
  8. Difference between int main() and int main(void)?
  9. How to set include path in xcode project
  10. How to use printf to display off_t, nlink_t, size_t and other special types?
  11. Set environment variables in C
  12. Questions about putenv() and setenv()
  13. What’s the difference between “int” and “int_fast16_t”?
  14. Does “volatile” guarantee anything at all in portable C code for multi-core systems?
  15. Dynamic Array of strings [closed]
  16. C: Reading strings from binary file
  17. what’s the differences between r and rb in fopen
  18. Work on a remote project with Eclipse via SSH
  19. Using pointer after free()
  20. Padding in structures in C
  21. What is the advantage of GCC’s __builtin_expect in if else statements?
  22. How to convert string to float?
  23. Spaces inserted by the C preprocessor
  24. What is the difference between signed and unsigned int
  25. Ranges of floating point datatype in C?
  26. signed and unsigned arithmetic implementation on x86
  27. What is the difference between a Linux platform driver and normal device driver?
  28. Checking if a dir. entry returned by readdir is a directory, link or file. dent->d_type isn’t showing the type
  29. What does =+ (equals-plus) mean in C?
  30. C string append

Leave a Comment